Class 6 Science Chapter 10 Extra Questions Living Creatures Exploring their Characteristics
Class 6 Science Chapter 10 Living Creatures Exploring their Characteristics Important Extra Questions and Answers
Living Creatures Exploring their Characteristics Class 6 Extra Questions Very Short Answer Type
Question 1.
What do you mean by germination of seeds?
Answer:
The beginning of a new plant from the seeds is called germination.
Question 2.
Name one characteristic which tells us that seeds are living things?
Answer:
Respiration.
Question 3.
What is breathing?
Answer:
The process of taking in oxygen and giving out carbon dioxide is called breathing.
Question 4.
What is respiration?
Answer:
Respiration is the chemical process in which food taken by an organism combines with oxygen to release energy.
Question 5.
What is stimuli?
Answer:
The changes in our surroundings that makes us respond to them are called stimuli.
Question 6.
What is excretion?
Answer:
The process of getting rid of the waste by the living organisms is known as excretion.
Question 7.
What is reproduction?
Answer:
The process by which living organisms produce more of their own kind is called reproduction.
Question 8.
Do animals move?
Answer:
Yes, animals move from one place to another.
Question 9.
Do plants move?
Answer:
Plants are generally fixed in the soil so they do not move from one place to another.
Question 10.
Name two living organisms that reproduce by laying eggs.
Answer:
Frog, pigeons.
Living Creatures Exploring their Characteristics Class 6 Extra Questions Short Answer Type
Question 1.
Give an example of a non-living which shows any two characteristics of living things.
Answer:
Clouds in the sky. They show nonliving characteristics.
(i) They grow in size.
(ii) They move from one place to another place.
Question 2.
What kind of movements do we see in plants?
Answer:
The movements are:
- Opening and closing of a flower.
- Growth of a stem and leaves.
Question 3.
How do the seeds with hard seed coat respire to get energy during the initiation of germination?
Answer:
Seeds with hard seed coat do not get sufficient oxygen for respiration. Therefore, they respire anaerobically in the initial stage and their start aerobic respiration which get sufficient oxygen.
Question 4.
Why plants die under waterlogged condition?
Answer:
Plants need oxygen to carry out aerobic respiration. The oxygen enters through stomata tenticles and through cell walls of root hair. Waterlogging stops gaseous exchange. So, the plants die.
Question 5.
Why do all living being need food?
Answer:
Animals need food to get energy for the various activities they perform. Plants also need food. Plants make their food from carbon dioxide in the air and water in the presence of light.
Question 6.
The animals and plant move in different ways flow?
Answer:
Animals move from one place to another for food, protection from enemies and protection from natural disasters like floods and forest fires.
Plants can move only parts of their body such as leaves, flowers, shoots and roots. The plant parts move towards a stimulus such as sunlight, water or gravity.
Question 7.
In what way the exhaled air is different from the inhaled air?
Answer:
Living organisms breath-in (inhaled air) oxygen from the air during respiration. Carbon dioxide and water vapour produced in the process (exhaled air) are breath out.
Question 8.
Explain ‘culting method’ of reproduction in plants.
Answer:
The small piece of any plant organ (stem, root or leaf) used for propagation is called cutting. In this method, about 20-30 cm long pieces of stem are planted in natural position in the wet soil. It gives off roots from the lower end and shoot buds from the aerial nodes. A cutting develops a new plant, similar to the parent plan.
Question 9.
Give two advantages of vegetative propagation.
Answer:
Following are the stages:
- Even those plants can be propagated by vegetative propagation which do not produce seeds or produce nonviable seeds.
- It is quick method of propagation.
Question 10.
There are two potted plants X and Y. The plant X has big, yellow flowers. The seeds of plant X are used for extracting an edible oil. When the potted plant X is placed near an open window of a room, the stem, leaves and flower of this plant bend towards stimulus Z coming from outside the room.
(a) What could the plant A and B be?
(b) Name the stimulus C.
Answer:
(a) A – sunflower plant
(b) B – Touch-me-not
(b) C – sunlight
Question 11.
Are there organisms which possess characteristics of both plants and animals?
Answer:
Yes, the unicellular organism, Euglena possesses characteristics of both plants and animals. It lacks a cell wall (like the animal) but contain the green pigment, chlorophyll (a plant characteristic).
Question 12.
Give difference in growth of plants and animals.
Answer:
Plants have unlimited growth. It means that they can grow throughout their lives. Further, the growth is restricted or localised to certain fixed regions of the plant body such as the root tip and the shoot tip. Animals, however, grow upto certain age only and stop growing thereafter. Moreover, they do not posses fixed growing points.
Question 13.
How do plants get rid of their waste products?
Answer:
In plants, carbon dioxide and water vapour are excreted from small pores in their leaves.
In some plants, waste are given out in the form of gums or a thick fluid called latex. These plant wastes are useful to human beings.
Question 14.
How is the movement of leaves of a sensitive plant different from the movement of a shoot towards light?
Answer:
Movement of leaves of a sensitive plant occurs due to turgor changes in the cells which causes drooping of leaves/ leaflets. Movement of a shoot towards light is a phototropic movement that is caused due to differential growth that occurs due to more concentration of auxins in one side.
Question 15.
What do you mean by stimuli? Give two examples.
Answer:
The changes in surroundings to which living things respond are called stimuli. If a man touches a very hot object accidentally, he quickly pulls his hand away from the hot object. In this case, the stimulus is heat and the man responds by moving his hand away from the hot object.
If a bare footed man steps on a sharp object like a nail, he quickly pulls away his food from nail. Here, the stimulus is pain produced by sharp object and the man responds by moving his foot away from nail.
Question 16.
Show that sunlight acts as a stimulus for plants.
Answer:
Place a potted plant in a dark room near on open window. Observe it after a few days. The upper portion of the shoot bent towards the open window, that is, towards light.
Plant to the direction of light.
In this case, the stimulus is sunlight and plant responds by bending its stem towards it. The plant stems bend towards sunlight because the leaves need sunlight to make food.
Question 17.
How does respiration occur in the roots of the plant?
Answer:
Air is present in between the particles of the soil. The roots take the oxygen by the process of diffusion. Oxygen first diffuses into the root hair and reaches all other cells of the root for respiration. Carbon dioxide produced in the cells moves out through the root hairs by the process of diffusion.
Question 18.
How does respiration occur in the stem of the plant?
Answer:
In the stem of herbaceous plants, Stomata are present. So, the exchange of gases take place through stomata by the process of diffusion. In the woody and hard stems of big plants, the exchange of gases takes place through lenticles which are present on the bark of the stem.
Question 19.
A small part A of the stem of a plant is removed with the help of a sharp knife in such a way that there is a growing point B. On it, the lower part of A is buried in the moist soil. After a few days, A develops roots and grows to become a new plant C.
(a) What is the plant part like A known as?
(b) Name (i) B, and (ii) C.
(c) Name one plant which is usually reproduced by this method.
Answer:
(a) Cutting
(b) (i) Bud, (ii) Plan
(c) Rose plant
Question 20.
Plants also respond to Stimuli. Give examples.
Answer:
Following are the examples :
(i) The leaves of the plant ‘Touch-me not’ drops on touching them.
(ii) The top of the shoot moves towards light. The movement of the plant (shoot) towards light is called phototropism. Phototropism is the response of plants towards light, which acts as a stimulus.
Question 21.
Write two examples of responses of plants to stimuli.
Answer:
(i) If a potted plant is kept in the open space, the stem of plant grows straight up towards the source of light ‘Sun’.
(ii) If we touch the leaves of a Momosa plant with our fingers, then the leaves ford up and droop.
Living Creatures Exploring their Characteristics Class 6 Extra Questions Long Answer Type
Question 1.
Give an activity to show that living things produce more of their own kind through reproduction.
Answer:
Aim: To show that living things produce more of their own kind through reproduction. Materials Required: A rose plant.
Procedure :
- A cutting of the existing rose plant (say of stem or shoot) having some buds on it is taken.
- Its lower part is buried in the moist soil.
- Observe it after a few days.
Observations: The cutting develops roots and grows into a new plant.
Conclusion : Plants (living things) reproduce to give new plants.
Question 2.
(i) Why do improperly stored cereals generally get spoiled during rainy season?
(ii) State any two effects of the action of micro-organisms on stored food grains.
Answer:
Following are the reasons:
(i) During rainy season, the moisture context of air i.e. humidity of air, is very high. The moisture speeds up the growth of pests like moulds, fungi and insects on the improperly stored cereals due to which they get spoiled.
(ii)
- The action of micro-organisms on stored food-grain leads to the production of poisonous substances called toxins.
- The action of micro-organisms on stored food-grains leads to discolouration, loss of weight and failure to germinate.
Question 3.
Explain the characteristics of living organisms.
Answer:
The characteristis are:
- Food and water : Food is a necessity of all living things. Plants are called autotrophs because they make their own food. Animals are called heterotrophs because they feed on plants or other animals.
- All living organisms show growth. Young ones of animals grow into adults. Plants also grow.
- All living organisms respire. In respiration oxygen is used for the oxidation of food and carbon dioxide is produced.
- All living organisms show excretion. The process of getting rid of waste product by the living organisms is called excretion. Plants also remove their wastes.
- All living organisms reproduce. The process by which plants and animals produce their own kind is called reproduction.
Question 4.
Write the differences between living things and non-living things.
Answer:
Living things
- Living things need food, air and water.
- Living things grow.
- Living things reproduce themselves.
- Living things respond to stimuli.
- Living things have a definite life-span after which they die.
Non-living things
- Non-living things do not need food, air or water.
- Non-living things do not grow.
- Non-living things do not reproduce.
- Non-living things do not respond to stimuli.
- Non-living things exists forever.
Question 5.
Explain the movement in plants.
Answer:
The plants are fixed in the soil at a place, so they cannot move like animals from place to place. The plants can move only parts of their body such as leaves, flowers, shoots and roots.The leaves and flower of a sunflower plant move by bending towards the sun to face the sunlight. Here sunlight is the stimulus towards which the leaves and flowers move or bend.
The movement of a part of the plant towards light is called phototropic movement. Some flowers show movements by opening or closing their pellets. The flowers of dandelion plant open up in the morning in response to sunlight and close in the vening, when the light fades.
Living Creatures Exploring their Characteristics Class 6 Picture Based Questions
I. Observe the figure and answer the following questions :
Question 1.
What does the gure show?
(a) Different stages of a snake
(b) Different stages of a rat
(c) Different stages of a frog
(d) Different stages of a fish
Answer:
(c) Different stages of a frog
Question 2.
Tadpole is the larva of
(a) Fish
(b) Snake
(c) Rat
(d) Frog
Answer:
(d) frog
Question 3.
Write the life cycle of a frog.
Answer:
Egg Tadpole Metamorphosis (of frog) (of larva) Frog (adult)
Question 4.
What is metamorphosis ?
Answer:
The process of transformation from an immature form of an animal like larve to its adult form in two or more distinct stages is called metamorphosis.
Question 5.
What term is used for the following ? “The change from tadpole to frog.”
Answer:
Metamorphosis.
II. Observe the figure and answer the following questions:
Question 1.
What we conclude from the above figure?
(a) The roots grow downward
(b) The roots grow upwards
(c) Both (a) and (b)
(d) None of these
Answer:
(c) Both (a) and (b)
Question 2.
What is phototropism ?
(a) Bending of plant towards shade
(b) Bending of plant towards light
(c) Bending upward
(d) Bending downward
Answer:
(b) Bending of plant towards light
Question 3.
What does the figure show?
Answer:
Direction of growth of root and shoot under different conditions.
Question 4.
What are stimuli ?
Answer:
The changes in surroundings to which living things respond are called stimuli.
Living Creatures Exploring their Characteristics Class 6 Case Based Questions
Seeds require water for germination. Water enables the seeds to carry out the processes necessary for their growth. The outer covering of the seed is called seed coat. Water softens the seed coat and helps the tiny embryo inside it to develop into a plant.
Question 1.
What do you mean by germination of seeds ?
(a) Begining of new plant from seed
(b) Sapling of a plant
(c) Growing plant towards light
(d) None of these
Answer:
(a) Begining of new plant from seed
Question 2.
When it is said that seed has germinated?
(a) When seed turns into a sapling
(b) When seed turns into sprout
(c) Both conditions are true
(d) None of these
Answer:
(b) When seed turns into sprout
Question 3.
Write the factors on which germination of seeds depends.
Answer:
Germination of seeds depends upon the availability of water, air and suitable light.
Question 4.
During germination of seeds, in which direction roots and shoots grow ?
Answer:
During germination of seeds, roots generally grow downwards, while shoots grow upwards.
Question 5.
What seed needs to germinate ?
Answer:
A seed needs water, warmth and air to germinate.
Question 6.
Write the different parts of a seed.
Answer:
Seeds have a seed coat, an embryo (baby plant) and one or two cotyledons.
Even though plants do not move from one place to another, they do show certain types of movements. Opening of flowers is one of the examples of movements in plants. Another example of movement in plants is seen insectivorous plants. Insectivorous plants are dependent on insects for their nutrition.
Question 1.
Name one plant whose flowers open up in the morning but close at night.
(a) Dandelion
(b) Pansy
(c) Daisy
(d) None of these
Answer:
(a) Dandelion
Question 2.
What kind of movement do we see in plants ?
(a) Opening and closing of a flower.
(b) Growth of a stem and leaves.
(c) Movement of water, minerals and food from one part of the plant to other.
(d) All of these
Answer:
(d) All of these
Question 3.
Do plants move ?
Answer:
Plants cannot move from place to place. The plants can move only parts of their body such as leaves, flowers, shoots and roots.
Question 4.
The petals of flower A open up at night but close during the day time. On the other hand, the petals of flower B open up in the morning but close after sunset.
(a) Name one flower which behaves like A.
(b) Name one flower which behaves like B
Answer:
(a) Moon flower
(b) Dandelion flower