Transportation in Animals and Plants Class 7 Extra Questions and Answers Science Chapter 11

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Class 7 Science Chapter 11 Extra Questions and Answers Transportation in Animals and Plants

Extra Questions for Class 7 Science Chapter 11 Transportation in Animals and Plants with Answers

Transportation in Animals and Plants Class 7 Extra Questions Very Short Answer Type

Question 1.
Name the transport medium in human beings.
Answer:
Blood.

Question 2.
What is pulse rate?
Answer:
The number of beats per minute is called the pulse rate.

Question 3.
What is the pulse rate of a resting person?
Answer:
A resting person, usually has a pulse rate between 72 and 80 beats per minute.

Question 4.
Where is heart located?
Answer:
The heart is located in the chest cavity with its lower tip slightly tilted towards the left.

Question 5.
What are the two upper chamber of hearts called?
Answer:
Atria.

Question 6.
What are ventricles?
Answer:
The two lower chambers of heart are called ventricles.

Transportation in Animals and Plants Class 7 Extra Questions Short Answer Type 1

Question 1.
What are the functions of arteries and veins?
Answer:
Arteries and veins are two types of blood vessels. Arteries carry oxygen-rich blood from the heart to all parts of thd body. On the other hand, veins carry carbon dioxide-rich blood from all parts of the body back to the heart.

Question 2.
Why do arteries have thick elastic walls ?
Answer:
Since the blood flow is rapid and at a high pressure, the arteries have thick elastic wralls.

Question 3.
Pulmonary artery carries carbon dioxide-rich blood, yet is not called a vein. Why ?
Answer:
Pulmonary artery carries blood from the heart to the lungs, so it is called an artery and not a vein.

Question 4.
Write two functions of sweat.
Answer:
(i) Removal of waste products (excess salts).
(ii) Cooling of body.

Transportation in Animals and Plants Class 7 Extra Questions Short Answer Type 2

Question 1.
Write about circulation in sponges and hydra.
Answer:
Animals such as sponges and Hydra do not possess any circulatory system. The water in which they live brings food and oxygen as it enters their bodies. The water carries away waste materials and carbon dioxide as it moves out. Thus, these animals do not need a circulatory fluid like the blood.

Question 2.
What is the role of haemoglobin?
Answer:
Haemoglobin binds with oxygen and transports it to all the parts of the body and ultimately to the cells. It will be difficult to provide oxygen efficiently to all the cells of the body without haemoglobin. So, it is vital for life.

Question 3.
Draw a schematic diagram of blood circulation.
Answer:

Question 4.
Write about excretion in aquatic and land animals.
Answer:
The way in which waste chemicals are removed from the body of the animal depends on the availability of water. Aquatic animals like fishes, excrete cell waste in gaseous form (ammonia) which directly dissolves in water. Some land animals like birds, lizards, snakes excrete a semi-solid, white coloured compound (uric acid). The major excretory product in humans is urea.

Transportation in Animals and Plants Class 7 Extra Questions Long Answer Type

Question 1.
Describe the excretion in humans.
Answer:
Kidney is the most important organ of excretion in humans. The mechanism to filter the blood is done by the blood capillaries in the kidneys. When the blood reaches the two kidneys, it contains both useful and harmful substances. The useful substances are absorbed back into the blood. The wastes dissolved in water are removed as urine.

From the kidneys, the urine goes into the urinary bladder through tube-like ureters. It is stored in the bladder and is passed out through the urinary opening at the end of a muscular tube called urethra. The kidneys, ureters, bladder and urethra form the excretory system.

Question 2.
How is water absorbed in plants?
Answer:
Plants absorb water and minerals by the roots. The root have root hairs. The root hairs increase the surface area of the root for the absorption of water and mineral nutrients dissolved in water. The root hairs are in contact with the water present between the soil particles.

Question 3.
How is water transported in plants?
Answer:
Plants have pipe-like vessels to transport water and nutrients from the soil. The vessels are made of special cells, forming the vascular tissue. The vascular tissue for the transport of water and nutrients in the plant is called the xylem.

The xylem forms a continuous network of channels that connects roots to the leaves through the stem and branches and thus transports water to the entire plant. The process of osmosis and transpiration too helps in movement of water in plants.

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