General Science Jkssb Biology Set 1 Mcqs (605 MCQs) | JKSSB & SSC Quiz

General Science

jkssb biology set 1 mcqs

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Practice Questions

605 Total
Question 401 Discuss
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Which of the following organisms shows 'Metagenesis' or alternation of generations

A
Hydra
B
Obelia
C
Aurelia
D
Adamsia

Answer & Explanation

Correct Option: B

Obelia alternates between a polyp (asexual) and a medusa (sexual) stage in its life cycle.
Question 402 Discuss
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What is the function of the 'Tapetum' in an angiosperm flower

A
To protect the young bud
B
To provide nourishment to the developing pollen grains
C
To attract insects for pollination
D
To help in the dehiscence of the anther

Answer & Explanation

Correct Option: B

The tapetum is the innermost layer of the anther wall that provides nutrients to the microspores.
Question 403 Discuss
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Which gas is primarily responsible for the 'Greenhouse Effect' on Earth

A
Oxygen
B
Nitrogen
C
Carbon Dioxide
D
Argon

Answer & Explanation

Correct Option: C

Carbon dioxide traps heat radiated from the Earth's surface, leading to a warming effect.
Question 404 Discuss
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The 'Hormone' secreted by the heart to reduce blood pressure is

A
ADH
B
ANF
C
Aldosterone
D
Renin

Answer & Explanation

Correct Option: B

Atrial Natriuretic Factor (ANF) causes vasodilation and increased salt excretion to lower blood pressure.
Question 405 Discuss
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The enzyme 'Enolase' requires which cofactor for its activity during glycolysis

A
Fe2+
B
Mg2+
C
Cu2+
D
Zn2+

Answer & Explanation

Correct Option: B

Magnesium ions are essential for several glycolytic enzymes, including enolase and hexokinase.
Question 406 Discuss
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Which of the following is 'NOT' a characteristic of a Prokaryotic cell

A
Presence of 70S Ribosomes
B
Lack of nuclear membrane
C
Presence of membrane-bound organelles
D
Presence of circular DNA

Answer & Explanation

Correct Option: C

Prokaryotes lack organelles like mitochondria, chloroplasts, and Golgi bodies.
Question 407 Discuss
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The 'WBC' that is most abundant in human blood and is primarily phagocytic is

A
Basophils
B
Eosinophils
C
Lymphocytes
D
Neutrophils

Answer & Explanation

Correct Option: D

Neutrophils make up about 60-70% of WBCs and are the first responders to infection.
Question 408 Discuss
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In the human ear 'Otoliths' or ear stones are found in which part

A
Cochlea
B
Semicircular canals
C
Utricle and Saccule
D
Malleus and Incus

Answer & Explanation

Correct Option: C

Otoliths are small calcium carbonate crystals that help in sensing gravity and linear acceleration.
Question 409 Discuss
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The 'Symbiotic' relationship between Algae and Fungi is found in

A
Mycorrhiza
B
Lichens
C
Legumes
D
Corals

Answer & Explanation

Correct Option: B

In a lichen, the fungus provides shelter and minerals while the algae (or cyanobacteria) provide food through photosynthesis.
Question 410 Discuss
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Which of the following is the 'Fastest' conducting tissue in the human heart

A
AV node
B
SA node
C
Purkinje fibers
D
Bundle of His

Answer & Explanation

Correct Option: C

Purkinje fibers conduct impulses at high speeds to ensure synchronized contraction of the ventricles.
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