Q12 of 41 Page 206

The given diagram shows parts of the urinary system of a mammal.


Identify the structures labelled A, B and C.

A. Renal artery – It supplies oxygenated blood from the heart to the kidney.


B. Renal vein – It carries deoxygenated blood from the kidney back to the heart.


C. Ureters – Paired tubes connecting kidneys to the urinary bladder. They transport urine from the kidneys to the bladder.


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How do plants get rid of their excretory products?

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What is the difference between excretion and defecation? Explain the process of excretion in humans.

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Outline the functioning of kidney dialysis machine?

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Ritu learned that excretion removes harmful metabolic wastes, i.e. nitrogenous wastes from the body. Different processes are employed in varied organisms depending on body’s organisation.

Read the passage and answer the following questions.


(i) Why can’t diffusion be carried out as excretory process in multicellular organisms?


(ii) Aquatic animals usually excrete ammonia as excretory waste. Give reason.


(iii) List the values observed in Ritu.