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 111 Discuss
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Which of the following can be a basis of difference between a salamander and a house-wall lizard apart from their habitat?

A
Scales on the skin
B
Egg-laying feature
C
Cold-blood
D
Three-chambered heart

Answer & Explanation

Correct Option: A

As true reptiles, house-wall lizards are covered in dry, scaly skin, whereas salamanders, being amphibians, strictly lack scales and possess smooth, heavily glandular, moist skin.
Question 112 Discuss
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Which of the following groups of organisms are more vulnerable to the acidification of ocean?

A
Marine algae
B
Marine mammals
C
Calcifying organisms
D
Marine reptiles

Answer & Explanation

Correct Option: C

Rising ocean acidification directly reduces the availability of essential carbonate ions, making it chemically extremely difficult for calcifying organisms like corals and shelled mollusks to build and maintain their calcium carbonate structures.
Question 113 Discuss
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What cellular structure is responsible for breaking down and recycling cellular components and molecules?

A
Lysosomes
B
Golgi apparatus
C
mitochondria
D
plastids themselves

Answer & Explanation

Correct Option: A

Lysosomes function as the highly acidic waste disposal system of the cell, actively utilizing potent hydrolytic enzymes to break down and safely recycle old, damaged, or unneeded cellular components.
Question 114 Discuss
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What do you call the body cavity that is lined by mesoderm?

A
Triploblasts
B
Diploblasts
C
Coelom
D
Radial symmetry

Answer & Explanation

Correct Option: C

The coelom is the principal fluid-filled internal body cavity found in most advanced animals, entirely lined by a protective layer of epithelial tissue derived exclusively from the embryonic mesoderm.
Question 115 Discuss
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Anorexia nervosa is an eating disorder in teenagers. Here body weight:

A
Drops dangerously low
B
Increases rapidly
C
Remains unaffected
D
Fluctuates daily

Answer & Explanation

Correct Option: A

Anorexia nervosa is characterized by an intense psychological fear of gaining weight, leading patients to severe caloric restriction until their body weight drops to dangerously low, life-threatening levels.
Question 116 Discuss
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The process by which a water body gradually becomes enriched with nutrients and minerals, mainly phosphorus and nitrogen, leading to enormous growth of algae on the surface of the water, thus decreasing the amount of dissolved oxygen in the water is known as:

A
Eutrophication
B
Hypoxia
C
Bioaccumulation
D
Biomagnification

Answer & Explanation

Correct Option: A

Eutrophication is an ecological phenomenon occurring when excess agricultural nutrients like nitrogen and phosphorus enter a water body, triggering explosive algal blooms that block sunlight and eventually deplete critical dissolved oxygen upon decomposition.
Question 117 Discuss
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Which virus is responsible for causing common cold?

A
Influenza virus
B
Rhinovirus
C
Rotavirus
D
HIV

Answer & Explanation

Correct Option: B

Rhinoviruses are globally the most frequent viral infectious agents in humans and represent the predominant biological cause of the illness commonly known as the common cold.
Question 118 Discuss
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What is the primary role of autotrophic organisms in an ecosystem?

A
Breaking down dead organisms
B
Preying on other organisms for food
C
Producing organic matter from inorganic substances
D
Converting organic matter into energy

Answer & Explanation

Correct Option: C

Autotrophs, ecologically known as primary producers, form the indispensable base of the entire food web by converting raw inorganic resources like sunlight and carbon dioxide into complex organic matter.
Question 119 Discuss
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Which of the following statements is NOT true about Plastids?

A
They have their own ribosomes.
B
Starch, oils and protein granules are stored in chromoplasts.
C
Stroma is found in chloroplast.
D
They have their own DNA.

Answer & Explanation

Correct Option: B

The statement is false because starch, essential oils, and protein granules are primarily stored in specialized colorless plastids called leucoplasts, whereas chromoplasts synthesize and specifically store distinct color pigments.
Question 120 Discuss
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Which of the following is considered unicellular green algae?

A
Cladophora
B
Chlamydomonas
C
Chlorophyta
D
Oedogonium

Answer & Explanation

Correct Option: B

Chlamydomonas is a highly studied genus of microscopic green algae consisting of isolated unicellular flagellates that are typically found freely swimming in stagnant water and thriving on damp soil.
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