NCERT Solutions for Class 10 Science Chapter 6 Life Processes

These NCERT Solutions for Class 10 Science Chapter 6 Life Processes Questions and Answers are prepared by our highly skilled subject experts to help students while preparing for their exams.

Life Processes NCERT Solutions for Class 10 Science Chapter 6

Class 10 Science Chapter 6 Life Processes InText Questions and Answers

In-text Questions (Page 95)

Question 1.
Why is diffusion insufficient to meet the oxygen requirement of multicellular organisms like humans?
Answer:
In multicellular organisms like man, hydra, spirogyra, the transport of oxygen and nutrients takes place by the process of diffusion but in chain smokers, walls between alveoli of lungs gets ruptured, resulting into abnormal alveoli having less surface for gaseous exchange. So gaseous exchange is reduced. In such cases heart pumps more blood to provide adequate oxygen. Thus, simple diffusion will not meet requirements of all the cells.

Question 2.
What criteria do we use to decide whether something is alive?
Answer:
Respiration, digestion, excretion, movement, reproduction etc. are the criteria to decide whether something is alive.

Question 3.
What are outside raw materials used for by an organism?
Answer:
The outside sources of energy could be quite varied; since the environment is not under the control of the individual organism. The process of acquiring oxygen from outside the body, and to use it, is what we commonly call respiration.

Question 4.
What processes would you consider essential for maintaining life?
Answer:
The following processes would be essential for maintain Life are –
(i) Respiration
(ii) Nutrition
(iii) Diggestion
(iv) Excretion
(v) Transportation

In-text Questions (Page 101)

Question 1.
What are the differences between autotrophic nutrition and heterotrophic nutrition ?
Answer:

Autotrophic Nutrition Heterotrophic Nutrition
1. The organisms synthesize their own food from simple organic raw materials. 1. The organisms cannot synthesize their own food from simple inorganic, raw materials.
2. For eg. all green plant are autotrophs. 2. For eg. all animals, human beings and non-green plants like bacteria and fungi.

Question 2.
Where do plant get each of the raw materials required for photosynthesis ?
Answer:
Break-down of pryuvate using (CO2) takes place in the mitochondria. Exchange of gases takes place through stomata and water from soil through root hairs and light/temperature from the sun and green colour from chlorophyll and the photosynthesis occurs in the grana of chloroplast and respiration in the stroma of chloroplast. So the required raw material for photosynthesis are :
(i) Sunlight, (ii) CO2, (iii) H2O (iv) Chlorophyll

NCERT Solutions for Class 10 Science Chapter 6 Life Processes

Question 3.
What is the role of the acid in our stomach ?
Answer:
HCL
(a) It makes the medium acidic.
(b) Softens the food.
(c) Kill germs i.e., bacteria/any foreign organism.

Question 4.
What is the function of digestion enzymes ?
Answer:
In Mouth (i) Salivary Amylase: Starch (complex sugars) → Maltose
In stomach (ii) (a) Pepsin – Proteins → peptones and proteoses
(b) Renin – Curdles milk (-nt in adults)
NCERT Solutions for Class 10 Science Chapter 6 Life Processes 1

In Duodenum: 1. Bile juice – Alkaline – Emulsifies fat.
2. Pancreatic juice – do –
(a) Trypsin : Proteins→ Peptones
Proteoses → Amino Acid and Peptides
(b) Amylosin : Complex sugars → monosaccharides
(c) Lipase : Fats → Fatty acids and glycerol

In Small Intestine – Intestinal juice – Alkaline –
(i) Erepsin : Peptides → Amino Acids
(ii) Invertase : Cane sugar → Glucose + Fructose
(iii) Lactase : Lactose → glucose + galactose

Question 5.
How is the small intestine designed to absorb digested food ?
Answer:
Small Intestine: Small intestine is about 6 metres in length and 2.5 cm in diameter. It remains coiled in the abdominal cavity. The small intestine consists of three parts.

  • Duodenum : It is U shaped in appearance. The openings of common bile duct and pancreatic duct opens in it.
  • Jejunum : It is about 2.5 metres long.
  • Ileum : It is about 3.5 metres long. It is distal in position.

In-text Questions (Page 105)

Question 1.
What advantage over an aquatic organism does a terrestrial organism have with regards to obtaining oxygen for respiration ?
Answer:
The organisms that live in water use the oxygen fairly low compared to the amount of oxygen in the air. So the rate of breathing is aquatic organisms is much faster than that seen in terrestrial organisms

NCERT Solutions for Class 10 Science Chapter 6 Life Processes

Question 2.
What are the different ways in which glucose is oxidised to provide energy in various organisms ?
Answer:
A biochemical process of stepwise oxidation or breaking down of organic compounds (simple carbohydrate like glucose) to release energy inside the hying cell at body temperature. The energy released in respiration sets stored in Adenosine Triphosphate [ATP] molecules.
NCERT Solutions for Class 10 Science Chapter 6 Life Processes 2

Question 3.
How is oxygen and carbon dioxide transported in human beings?
Answer:
When haemoglobin combines with oxygen it forms oxyhaemoglobin.

  • Carbon dioxide it forms carbamino haemoglobrn.
  • Carbon monoxide it forms carboxy haemoglobin.

NCERT Solutions for Class 10 Science Chapter 6 Life Processes 3

Question 4.
How are the lungs designed in human beings to maximize the area tor exchange of gases ?
Answer:
Mechanism of Breathing : Breathing is a mechanical process. It is complete in two steps.
1. Inspiration [Inhalation]: It is a process by which fresh air enters the lungs. During inspiration the volume of thoracic cavity and lungs increases due to

  • Contraction of rib muscules, which pull the ribs upwards.
  • Contraction of diaphragm muscles causes flatening of dome-shaped diaphragm.
  • The air pressure in lungs decreases and air rushes in lungs.

2. Expiration [Exhalation] : It is process by which foul air is expelled out from the lungs. During expiration volume of thoracic cavity decreases due to

  • Relaxation of rib muscles which pushes the ribs inward and
  • Due to relaxation of diaphragm muscles diaphragm becomes dome shaped. This presses the lungs and air is expelled out.

NCERT Solutions for Class 10 Science Chapter 6 Life Processes 4

In-text Questions (Page 110)

Question 1.
What are the components of transport system in human beings? What are the functions of these components?
Answer:
Blood transports food, oxygen and waste materials in our bodies. It is a connective tissue. It consists of a fluid called plasma in which RBCs, WBCs, Blood platelets are suspended. Plasma transports food, carbondioxide and nitrogenous wastes indissolved forms. (O2) is carried by RBCs and like salts and other substances transported by the blood. So we need a pumping organ to push blood around the body. A network of tubes to reach all the tissues and a system in place to ensure that this network can be repaired if damaged.

Question 2.
Why is it necessary to separate oxygenated and Deoxygenated blood in mammals and birds?
Answer:
It is necessary to separate oxygenated and deoxygenated blood in mammals and birds because while we take food due to the oxidation of food in respiration, energy is released in the form of glucose and CO2. This CO2 comes from different organs and tissues to the heart in the form of impure blood and then transferred to the lungs and comes out in the form of expiration (breathing) and intake of (O2) in the form of inspiration to the lungs and then to the heart as a pureblood. This process takes place though haemoglobin hence it is necessary.

Question 3.
What are the components of transport system in highly organized plants?
Answer:
Xylem and phloem are the main components of transport system in highly organised plants.

NCERT Solutions for Class 10 Science Chapter 6 Life Processes

Question 4.
How are water and minerals transported in plants?
Answer:
Water and minerals are transported in plants through Xylem components.

Question 5.
How is food transported in plants?
Answer:
Food is transported in plants by the phloem and its components.

In-text Questions (Page 112)

Question 1.
Describe the structure and functioning of nephrons ?
Answer:
Each nephron is made up of two main
NCERT Solutions for Class 10 Science Chapter 6 Life Processes 5
Malpighian body (renal corpusle) Renal tubule Malphigian body comprised of cup-shaped Bowman’s capsule and network of blood capillaries the glomerulus. The Bowman’s capsule is lined by a single layer of Squamous epithelial cells. An different arteriole enters a Bowman’s capsule to form glomerulus. The different arteriole leaves the glomerulus. The Bowman’s capsule leads into the renal tubule, is highly coiled
NCERT Solutions for Class 10 Science Chapter 6 Life Processes 6
looped and it consists of Proximal convoluted tubule (PCT) loop of Henle (U shaped) and Distal convoluted tubule (DCT). The collecting tubules of many nephrons join to form the collecting duct. It collect urine from nephrons and transport it into renal pelvis through renal pyramids.

Question 2.
What are the methods used by plants to get rid of excretory products?
Answer:
The methods used by plants to get rid of excretory products are excess water by transpiration waste products generated during photosynthesis and are stored as resins and gums. Plants also excrete some waste substances into the soil around them.

Question 3.
How is the amount of urine produced regulated?
Answer:
In a normal healthy adult the initial filtrate in the kidneys about 180 L daily. However, the volume actually excreted is only a litre or two a day, because the remaining filtrate is reabsorbed in the kidney tubules.

Class 10 Science Chapter 6 Life Processes Textbook Questions and Answers

Page No. 113

Question 1.
The kidneys in human beings are a part of the system for
Answer:
(c) Excretion

Question 2.
The xylem in plants are responsible for
Answer:
(a) Transport of water

NCERT Solutions for Class 10 Science Chapter 6 Life Processes

Question 3.
The autotrophic mode of nutrition requires-
Answer:
(d) All of the above

Question 4.
The break down of pyruvate to give CO2, H2O and energy takes place in
Answer:
(b) Mitochondria.

Question 5.
How are fats digested in our bodies? Where does this process take place ?
Answer:
Fats are digested in our body in the liver, which is the largest gland in the human body. It secrets bile juice, which is stored in gall bladder before it is poured into duodenum through a common bile duct. Bile is alkaline due to the presence of bile salts and bile pigments. Bile helps in-

  • Emulsification of fat (emulsification means breaking the fat into small globules)
  • Activates the pancreatic and intestinal enzymes by making the food alkaline.

Question 6.
What is the role of saliva in the digestion of food?
Answer:
Saliva performs the following functions in the digestion of food. It moistens and lubricates, food and helps in swallowing. It contains an enzyme, salivary amylase, which carries out partial digestion of starch into maltose.

Question 7.
What are the necessary conditions for autotrophic nutrition and what are its by-products?
Answer:
Autotrophic organisms synthesize their own food from simple in organic raw materials i. e. CO2, and H2O in the presence of sunlight and chlorophyll. This is known as photosynthesis glucose is the main product of photosynthesis, oxygen is released as a by product of photosynthesis, ATP and NADPH synthesized during light reaction are used in dark reaction for Fixation of CO2.

NCERT Solutions for Class 10 Science Chapter 6 Life Processes

Question 8.
What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration?
Answer:

Aerobic respiration Anaerobic respiration
1. Aerobic respiration takes place in the presence of oxygen 1. Anaerobic respiration takes place in the absence of oxygen.
2. It occurs both in cytoplasm (glycolysis) and in the mitochondria (Kreb’s cycle) 2. It occurs only in the cytoplasm.
3. Glucose is broken down in CO2 and water. 3. Glucose is broken into CO2 and ethyl alcohol/ lactic acid, incomplete breakdown of glucose takes place.
4. Complete breakdown of glucose takes place. 4. Only 2 ATP per gram mole of glucose are formed.
5. 38 ATP per one GM mole of glucose are formed e.g. most of the animal and humans beings. 5. Eg. some bacteria

Question 9.
How are the aveoli designed to maximise the exchange of gases ?
Answer:
NCERT Solutions for Class 10 Science Chapter 6 Life Processes 7
The alveoli provide a surface where the exchange of gases can take place. The walls of the alveoli contain an extensive network of blood vessels.

Question 10.
What would be the consequences of a deficiency of blood vessels, haemoglobin in our bodies?
Answer:
Function of haemoglobin in our bodies is transportation of (O2) and (CO2). Oxygen combines with haemoglobin of red blood cells in lungs to form oxyhaemoglobin (bright red) In tissues Oxyhaemoglobin loses O2 to form haemoglobin due to low concentration of (O2) and high concentration of CO2, water and Energy in the form of ATP. Transport of CO2, liberated during metabolic activities in the cells. It is transported to lungs in two forms.
NCERT Solutions for Class 10 Science Chapter 6 Life Processes 8
(Hb) is called the respiratory pigment found in red blood cells of mammals including humans. But in earthworm it is found dissolved in plasma.

Note: Due to the deficiency of haemoglobin in our body exchange of gases will not take place (reduced). In such cases heart pumps more blood to provide adequate oxygen.

Question 11.
Describe double circulation In human beings. Why is It necessary?
Answer:
Double circulation: “The flow of blood twice through the heart before it is pumped throughout the body is known as double circulation.”
NCERT Solutions for Class 10 Science Chapter 6 Life Processes 9

Question 12.
What are the differences between the j transport of materials in xylem and phyloem?
Answer:
Transport of materials in plants: In higher plants the transport system is made up of tube-like structures called xylem and phyloem. The water and minerals absorbed by roots are transported upward through the xylem tissue, while food prepared by the leaves is transported downward through sieve tubes of the phyolem.

NCERT Solutions for Class 10 Science Chapter 6 Life Processes

Question 13.
Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning?
Answer:
Alveoli in lungs: Oxygen diffuses from alveoli to the blood capillaries where as CO2, diffuses from blood capillaries into the lungs alveoli. Each branchiole ends into a cluster of tiny air chambers called the air sacs/alveoli. Alveoli are lined by a layer of moist flat epithelial cells and surrounded by network of blood capillaries. It is the functional unit of the lungs. Alveoli are the actual site of gaseous exchange.

Nephrons the Kidneys: Each kidney has large number of filtration units called nephrons. Their main function is to filter the urine.

Class 10 Science Chapter 6 Life Processes Textbook Activities

Activity 6.1 (Page 96)

  • Take a potted plant with variegated leaves for example, money plant or crotons.
  • Keep the plant in a dark room for three days so that all the starch gets used up.
  • Now keep the plant in sunlight for about six hours.
  • Pluck a leaf from the plant. Mark the green areas in it and trace them on a sheet of paper.
  • Dip the leaf in boiling water for a few minutes.
  • After this, immerse it in a beaker containing alcohol.
  • Carefully place the above beaker in a water-bath and heat till the alcohol begins to boil.
  • What happens to the colour of the leaf?
    What is the colour of the solution?

NCERT Solutions for Class 10 Science Chapter 6 Life Processes 10

  • Now dip the leaf in a dilute solution of iodine for a few minutes.
  • Take out the leaf and rinse off the iodine solution.
  • Observe the colour of the leaf and compare this with the tracing of the leaf done in the beginning.
  • What can you conclude about the presence of starch in various areas of the leaf?

Answer:
(i) The leaves are kept in dark place for about three days to de-starch, then placed in bright sunshine for three to four days.
(ii) The leaf is boiled in alcohol; so the green parts of the leaf get de-colourised. After washing the leaf in water; pour some iodine solution over the colourless leaf and observe the change in colour of the leaf .
(iii) The outer part of the leal that was originally white does not turn blue-black, which shows that no starch is present in this outer part of the leaf.
(iv) The inner part of the leaf turns blue-black on adding iodine solution to it. This shows that starch is present in the inner part. This is illustrated by the figure.
We conclude that photosynthesis does not take place without chlorophyll.

Activity 6.2 (Page 97)

  • Take two healthy pottéd plants which are nearly the same size.
  • Keep them in a dark room for three days.
  • Now place each plant on separate glass plates. Place a watch-glass containing potassium hydroxide by the side of one of the plants. The potassium hydroxide is used to absorb carbon dioxide.

NCERT Solutions for Class 10 Science Chapter 6 Life Processes 11

  • Cover both plants with separate bell-jars as shown in Fig.
  • Use vaseline to seal the bottom of the jars to the glass plates so that the set-up is air-tight.
  • Keep the plants in sunlight for about two hours.
  • Pluck a leaf from each plant and check for the presence of starch as in the above activity.

Question 1.
Do both the leaves show the presence of the same amount of starch?
Answer:
(a) With potassium hydroxide : [KOH] – KOH will absorb all the CO2 present in set-up apparatus. So the leaves of this experiment show very less amount of starch.
(b) Without potassium hydroxide: The leaves shows the presence of the large amount of starch in this set up.

Question 2.
What can you conclude from this activity?
Answer:
We conclude that during photosynthesis synthesize of starch in the leaf does not take place without carbondioxide.

In other words CO2, is necessary for the process of photosynthesis to occur.

NCERT Solutions for Class 10 Science Chapter 6 Life Processes

Activity 6.3 (Page 99)

  • Take 1 mL starch solution (1%) in two test tubes (A and B).
  • Add 1 mL saliva to test tube A and leave both test tubes undisturbed for 20-30 minutes.
  • Now add a few drops of dilute iodine solution to the test tubes.

Question 1.
In which test tube do you observe a colour change?
Answer:
In Test Tube (A) it contains an enzyme; salivary amylase, which carries out partial digestion of starch into maltose due to this the colour of this tube will be yellowish.

Question 2.
What does this indicate about the presence or absence of starch in the two test tubes?
Answer:
In Test-Tube (B) after adding few drops of Iodine solution the colour will be blue-black it indicate the presence of starch in T.T. (A) and absence (-nee) in T.T. (B) does not indicate the digestion of starch.

Question 3.
What does this tell us about the action of saliva on starch?
Answer:
This tells us that it is done with the help of biological catalyst called enzymes which contains saliva called salivary amylase that breaks down starch a complex mole and to give sugar.
NCERT Solutions for Class 10 Science Chapter 6 Life Processes 12

Activity 6.4 (Page 101)

  • Take some freshly prepared lime water in a test tube.
  • Blow air through this lime water.
  • Note how long it takes for the lime water to turn milky.
  • Use a syringe or pichkari to pass air through some fresh lime water taken in another test tube (Fig.)
  • Note how long it takes for this lime water to turn milky.

Solution of Test-Tube (a) The less amount of water turns milky because there is very less quantity CO2 in air. It shows the aerobic respiration.
Solution of Test-Tube (b) Air being exhaled into lime water will turn milky quickly because we realease CO2 in our breath. It shows the anaerobic respiration.

Question 1.
What does this tell us about the amount of carbon dioxide in the air that we breathe out ?
Answer:
It means we give (CO2) and intake (O2) the breathed out CO2 turns the lime water milky. It tells us about Aerobic respiration.

NCERT Solutions for Class 10 Science Chapter 6 Life Processes

Activity 6.5 (Page 101)

  • Take some fruit juice or sugar solution and add some yeast to this. Take this mixture in a test tube fitted with a one-holed cork.
  • Fit the cork with a bent glass tube. Dip the free end of the gbss tube ìnto a test tube containing freshly prepared lime water.

NCERT Solutions for Class 10 Science Chapter 6 Life Processes 13

Question 1.
What change is observed in the lime water and how long does it take for this change to occur?
Answer:
Accumulation of lactic acid causes muscle fatigue It depend upon the kind of bacteria. It is called fermentation. Lime water change into milky.

Question 2.
What does this tell us about the products of fermentation ?
Answer:
In Anaerobic respiration, carbondioxide and lactic acid/ethyl alcohol is produced, it is called fermentation.
NCERT Solutions for Class 10 Science Chapter 6 Life Processes 14

Activity 6.6 (Page 103)

  • Observe fish in an aquarium. They open and close their mouths and the gill-slits (or the operculurn which covers the gill-slits) behind their eyes also open and close. Are the timings of the opening and closing of the mouth and gill-slits coordinated in some manner?
  • Count the number of times the fish opens and closes its mouth in a minute.
  • Compare this to the number of times you breathe in and out in a minute.
  • Fishes take in water through. their mouths and in the gills the dissolved oxygen is taken up by the blood.
  • The rate, of breathing is aquatic organisms is much faster than that seen in terrestrial organisms.

NCERT Solutions for Class 10 Science Chapter 6 Life Processes

Activity 6.7 (Page 105)

  • Visit a health centre in your locality and find out what is the normal range of haemoglobin content in human beings.
  • It is the same for chiIdrtn and adults?
  • Is there any difference in the haemoglobin levels for men and women?
  • Visit a veterinary clinic in you locality. Find out what is the normal range of haemoglobiri content In an animal like the buffalo or cow.
  • Is this content different in calves, male and female animals ?
  • Compare the difference seen in male and female human beings and animals.
  • How would the difference, if any, by explained ?

NCERT Solutions for Class 10 Science Chapter 6 Life Processes 15
Normal Range of haemoglobin
Hb Level’s for Animals
for buffalo → 12.9 –
for cow → 11.3 –
for calves male → 6 – 11
for calved female → 6 – 11

Activity 6.8 (Page 109)

  • Take two small pots of approximately the same size and having the same amount of soil. One should have a plant in it. Place a stick of the same height as the plant in the other pot.
  • Cover the soil in both pots with a plastic sheet so that moisture cannot escape by evaporation.
  • Cover both sets, one with the plant and the other with the sick1 with plastic sheets and place in bright sunlight for half an hour.

Question 1.
Do your observe any difference in the two cases?
Answer:
From both experiments it is clear that transpiration takes place only by aerial parts of the plants (leaves) not from the pot soil.
Note : The rate of Transpiration by Atmospheric condition.

  • modification of leaf into spines.
  • having thick cuticle
  • If wary coating is made on the sun faced leaf.

Class 10 Science Chapter 6 Life Processes Additional Important Questions and Answers

Very Short Answer Type Questions

Question 1.
What kind of nutrition occurs in fungi?
Answer:
Heterotrophic.

Question 2.
Name the cellular organelles where the following process occurs:
(i) Photosynthesis (ii) Cellular aerobic respiration
Answer:
(i) Chloroplast
(ii) Mitochondria

NCERT Solutions for Class 10 Science Chapter 6 Life Processes

Question 3.
Which raw material is primarily responsible for the release of molecular (O2) in photosynthesis?
Answer:
In photosynthesis, the molecular of (O2) is released from water.

Question 4.
Name the cartilaginous flap which closes the glottis to check the entry of food into It during swallowing.
Answer:
Epiglottis

Question 5.
Give one example each of the following-
(i) Autotroph
(ii) Herbivore
(iii) Carnivore
(iv) Omnivore
Answer:
(i) Green plants,
(ii) Cow,
(iii) Lion,
(iv) Man.

Short Answer Type Questions

Question 1.
Why are plants green?
Answer:
Plants possess green chloroplastic pigments called chlorophyll which absorb most of the blue and red regions of the incident light. They reflect green light so the plants look green in colour.

Question 2.
What is emulsification? Name the organ where fat is emulsified in the alimentary canal of human beings.
Answer:
Emulsification is the breakdown of the large fat droplets into smaller ones. It occurs in the small intestine.

Question 3.
What is the role of hydrochloric acid in human digestive system ?
Answer:
Hydrochloric acid (HCl) secreted inside the stomach makes the medium acidic for digestion of protein. HCl also causes disinfection of the food.

NCERT Solutions for Class 10 Science Chapter 6 Life Processes

Long Answer Type Question

Question 1.
Explain the following aspects of photosynthesis in plants
(i) The role of chlorophyll
(ii) Dark reaction
(iii) Calvin-Benson cycle.
Answer:
Mechanism of Photosynthesis: G.K., phota = light,
Synthesis = putting together

(i) The role of chlorophyll: Chlorophyll are the green coloured photosynthetic pigments present in all the green plants. They mainly occur in the leaves, through small amount of these pigments may also be present in stems and green branches. There are mainly five spectral forms of chlorophylls chlorophyll a, b, c, d and e.

The chlorophyll (a) and chlorophyll (b) occur in all green plants, whereas chlorophyll (c), (d) and chlorophyll (e)are distributed only in some algae. The chlorophylls give of white light except green light. They reflect green light. This is the reason that photosynthesis does not occur in green light.

(ii) Dark reaction : The dark reaction of photosynthesis utilizes the product of light reaction ie. Assimilatory power (NADPH and ATP) to incorporate carbon from carbon dioxide into carbohydrate. Although, the reaction itself does not require light but it occurs in light and continues for a very brief period after a plant is kept in the dark. The dark reaction occurs inside the stroma of chloroplast where all the necessary enzymes are located.

(iii) Calvin-Benson cycle: Fixation of CO2, into carbohydrate is not one step process. It involves several reactions which occur in a cyclic manner. Carbon dioxide enters at the starting point of the cycle where it reacts with a pentose sugar, called ribulose bisphosphate (KUBP). The first sugar synthesised from carbon dioxide is a triose sugar- 3 (Phosphoglyceric Acid). A large number of reactions occurring in a cyclic manner synthesise hexose and regenerate ribulose bisphosphate. This cycle was discovered by Melvin-Calvin and Andy Benson. Therefore, this cycle is known as Calvin- Benson cycle/Calvin cycle or C3, cycle.

Multiple Choice Questions

Question 1.
The matrix of chloroplast is known as
(a) Grana
(b) Stroma
(c) Thylakoid
(d) Lamella
Answer:
(b) Stroma

NCERT Solutions for Class 10 Science Chapter 6 Life Processes

Question 2.
The green colour of plants is due to the presence of
(a) Chlorophyll
(b) Carotene
(c) Xanthoplyll
(d) Starch
Answer:
(a) Chlorophyll

Question 3.
The word ‘sapro’ means
(a) Cell sap
(b) Dead
(c) Other
(d) Rotten
Answer:
(d) Rotten

Question 4.
The visible part of electromagnetic spectrum lies in between
(a) X-ray and Ultra-violet
(b) Ultraviolet and infrared
(c) Infrared and microwave
(d) Gamma-ray and X-ray
Answer:
(b) Ultraviolet and infrared

Question 5.
Holozoic nutrition occurs in
(a) Amoeba
(b) Plasmodium
(c) Roundworm
(d) Bacteria
Answer:
(a) Amoeba

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