The hormone that increases water reabsorption in the collecting duct is: MCQ with Answer and Explanation

The hormone that increases water reabsorption in the collecting duct is:
A. Antidiuretic hormone (ADH)
B. Natriuretic peptide
C. Aldosterone
D. Renin
Answer: Option A
Solution (By JKSSB Mock Tests)
ADH (vasopressin) from the posterior pituitary increases water permeability of collecting duct cells by inserting aquaporins, reducing urine volume.

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Practice More Biology Questions

Question #1
The process by which atmospheric nitrogen is converted to ammonia by industrial process is:
A. Denitrification
B. Haber-Bosch process
C. Ammonification
D. Nitrification

Correct Answer: Option B


Explanation:
The Haber-Bosch process synthesizes ammonia from N₂ and H₂ under high temperature and pressure with a catalyst. It is the main industrial nitrogen fixation for fertilizers. Biological fixation is by microbes.

This question belongs to: Science Biology
Question #2
In biotechnology, 'Bt brinjal' is a genetically modified crop developed to provide resistance against:
A. The fruit and shoot borer (Leucinodes orbonalis)
B. Herbicides
C. Fungal infections
D. Viral diseases

Correct Answer: Option A


Explanation:
Bt brinjal is a transgenic eggplant (brinjal) developed by inserting the cry1Ac gene from the soil bacterium Bacillus thuringiensis (Bt). This gene codes for a crystal protein that is toxic to the larvae of the brinjal fruit and shoot borer (Leucinodes orbonalis), a major pest that causes significant yield loss. When the insect ingests the plant tissue, the alkaline gut activates the toxin, creating pores in the gut lining and killing the pest.

This question belongs to: Science Biology
Question #3
Identify the correct statement about evolution:
A. Fossils provide direct evidence of evolution.
B. The human appendix is a homologous organ.
C. Analogous organs indicate common ancestry.
D. Lamarck proposed the theory of natural selection.

Correct Answer: Option A


Explanation:
Fossils are direct evidence showing transitional forms. Lamarck proposed use and disuse, not natural selection. Analogous organs do not indicate common ancestry; homologous do. Appendix is vestigial.

This question belongs to: Science Biology