NCERT · Class 11 · Biology

Chapter 7: Structural Organisation in Animals

Practice each question, then open the answer or worked solution.

Questions

14 questions

Q11Written answer

Match the terms in column I with those in column II.

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Worked solution

Q12Written answer

Mention the circulatory system of earthworms briefly.

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The earthworm has a closed circular system which comprises blood vessels, capillaries and the heart.
In earthworms, blood is confined to the heart and blood vessels, as they have a closed circulatory system.
Contraction keeps blood circulating in one direction.
Blood glands are present on the 4th, 5th and 6th segments. They produce blood cells, haemoglobin, that are dissolved in the plasma of the blood.
Blood cells are phagocytic.
A specialised breathing system is absent; hence, the moist body surface helps in the respiratory exchange with their bloodstream

Q13Written answer

Draw a neat diagram of the digestive system of a frog.

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Worked solution

The diagram is as below.

Frog digestive system

Q14Written answer

Mention the function of the following (a) Ureters in frogs (b) Malpighian tubules (c) Body wall in earthworms

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Worked solution

Ureters in frog – Acts as a urinogenital duct which carries urine and sperm in the male frog.
Malpighian tubules – Malpighian tubules are excretory organs in cockroaches.
Body wall in earthworm – Helps in movement and burrowing

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