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Solved Examples: Excretory Products & their Elimination | NCERT Exemplar & Revision Notes for NEET PDF Download

Q.1. Ureters act as urogenital ducts in     [CBSE PMT’2011 M]
(a) Human males
(b) Human females
(c) Both female and male frog
(d) Male frog
Ans: 
d
Solution:

In male frogs the sperms are carried through the ureters, hence in male, ureters are called urinogenital ducts.

Q.2. Uricotelic mode of passing out nitrogenous wastes is found in    [CBSE PMT’2011]
(a) Reptiles and birds
(b) Birds and annelids
(c) Amphibians and reptiles
(d) Insects and amphibians
Ans: 
a
Solution:

A uricotelic organism produces uric acid as a result of deamination. Examples of such organisms are birds and insects.

Q.3. Which one of the following is not a part of renal pelvis?    [CBSE PMT’2011]
(a) Peritubular capillaries
(b) Convoluted tubules
(c) Collecting ducts
(d) Loops of Henle
Ans: 
c
Solution:

Renal pelvis is the innermost portion of kidney. So, collecting ducts are not a part of renal pelvis.

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FAQs on Solved Examples: Excretory Products & their Elimination - NCERT Exemplar & Revision Notes for NEET

1. What are excretory products and how are they eliminated from the body?
Ans. Excretory products are waste substances produced by the body as a result of various metabolic processes. These waste products include carbon dioxide, urea, uric acid, and excess salts. They are eliminated from the body through specific excretory organs such as the lungs, kidneys, and skin. Carbon dioxide is eliminated through respiration in the lungs, while the kidneys filter out waste products like urea and excess salts from the blood to be excreted as urine. The skin also plays a role in eliminating waste products through sweat.
2. What is the role of the kidneys in excretion?
Ans. The kidneys are the main excretory organs in the human body. They filter waste products, excess water, and harmful substances from the blood to produce urine. The urine is then transported to the urinary bladder for temporary storage before being eliminated from the body through the urethra. The kidneys also play a vital role in maintaining the balance of water, electrolytes, and pH levels in the body.
3. How does the respiratory system eliminate excretory products?
Ans. The respiratory system eliminates excretory products, primarily carbon dioxide, through the process of respiration. During respiration, oxygen is taken in by the body, and carbon dioxide, a waste product of cellular metabolism, is expelled. The exchange of gases occurs in the lungs, where oxygen is absorbed into the bloodstream and carbon dioxide is released into the air during exhalation. This allows for the removal of carbon dioxide, a waste product, from the body.
4. What is the role of the skin in excretion?
Ans. The skin acts as an excretory organ by eliminating waste products from the body through sweat. Sweat glands in the skin secrete sweat, which contains water, salts, urea, and other waste substances. When the body temperature rises or during physical activity, sweat is produced to cool down the body. This process helps in excreting excess salts, water, and small amounts of urea from the body.
5. How do the excretory products contribute to maintaining homeostasis in the body?
Ans. Excretory products play a crucial role in maintaining homeostasis, which refers to the stable internal environment of the body. By eliminating waste products such as carbon dioxide, urea, and excess salts, the excretory system helps regulate the pH balance, electrolyte levels, and water content in the body. This ensures that the body's internal environment remains stable and functions optimally. Without the elimination of excretory products, the accumulation of waste substances would disrupt the body's balance, leading to various health problems.
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