NCERT Class VII Science Solutions: Chapter 11-Transportation in Animals and Plants Part 2
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VERY SHORT ANSWER QUESTIONS
Question 7:
Veins have valves which allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?
Answer:
Blood flow in arteries is rapid and at a high pressure. Also arteries have thick elastic walls.

Direction of Blood Flow
Image of direction of blood flow
Question 8:
What is the special feature present in a human heart which does not allow mixing of blood when oxygen-rich and carbon dioxide-rich blood reach the heart?
Answer:
Heart is partitioned into four chambers.

Four Chambers of Heart
Image of four chambers of heart
Question 9:
Name the organ which is located in the chest cavity with its lower tip slightly tilted towards the left.
Answer:
Heart.
SHORT ANSWER QUESTIONS
Question 10:
Look at Figure. Draw another figure of the same set-up as would be observed after a few hours.

Potato in Sugar Leval Check (Q)
Result for Potato in sugar leval check (Q)
Answer:

Potato in Sugar Leval Check (A)
Result for Potato in sugar leval check (A)
Question 11:
Arrange the following statements in the correct order in which they occur during the formation and removal of urine in human beings.
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Ureters carry urine to the urinary bladder.
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Wastes dissolved in water are filtered out as urine in the kidneys.
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Urine stored in urinary bladder is passed out through the urinary opening at the end of the urethra.
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Blood containing useful and harmful substances reaches the kidneys for filtration.
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Useful substances are absorbed back into the blood.
Answer: