Which plant hormone is known as the 'stress hormone' and promotes seed dormancy? MCQ with Answer and Explanation

Which plant hormone is known as the 'stress hormone' and promotes seed dormancy?
A. Abscisic acid (ABA)
B. Gibberellin
C. Cytokinin
D. Ethylene
Answer: Option A
Solution (By JKSSB Mock Tests)
Abscisic acid (ABA) is called the stress hormone because it accumulates under adverse conditions (drought, cold) and triggers adaptive responses like stomatal closure. It also promotes seed dormancy and inhibits germination. Gibberellins break seed dormancy, cytokinins promote cell division, ethylene promotes fruit ripening. ABA is antagonistic to gibberellins.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Biology Questions

Question #1
The condition characterized by increased intraocular pressure damaging the optic nerve is:
A. Conjunctivitis
B. Cataract
C. Glaucoma
D. Retinal detachment

Correct Answer: Option C


Explanation:
Glaucoma is a group of eye diseases that result in damage to the optic nerve, often associated with elevated intraocular pressure. It can lead to permanent vision loss if untreated. Cataract is lens clouding, conjunctivitis inflammation of the conjunctiva, retinal detachment is separation of the retina.

This question belongs to: Science Biology
Question #2
The 'Red Data Book' is a document maintained by the IUCN that provides information about:
A. The most common and abundant species in the world
B. The chemical composition of various red pigments in nature
C. The blood groups of different animal species
D. Threatened and endangered species of plants and animals

Correct Answer: Option D


Explanation:
The Red Data Book (or Red List) is a comprehensive document maintained by the International Union for Conservation of Nature (IUCN). It records the global conservation status of plant and animal species. It categorizes species based on their risk of extinction, using categories like Extinct, Extinct in the Wild, Critically Endangered, Endangered, Vulnerable, Near Threatened, and Least Concern. It serves as a critical tool for identifying species that require urgent conservation efforts.

This question belongs to: Science Biology
Question #3
The organ that is responsible for the detoxification of ammonia to urea in humans is the:
A. Pancreas
B. Spleen
C. Kidney
D. Liver

Correct Answer: Option D


Explanation:
The liver converts toxic ammonia (from amino acid deamination) into less toxic urea via the urea cycle (ornithine cycle) in hepatocytes. Urea is then excreted by the kidneys. The kidneys filter urea but do not produce it. Pancreas produces enzymes/hormones, spleen filters blood.

This question belongs to: Science Biology