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 531 Discuss
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Which of the following describes 'Genetic Drift' accurately

A
Change in gene frequency due to natural selection
B
Random change in gene frequencies in a small population
C
Movement of genes from one population to another
D
Creation of new alleles through radiation

Answer & Explanation

Correct Option: B

Genetic drift is a stochastic process that can lead to the loss of alleles regardless of their benefit.
Question 532 Discuss
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The 'Islets of Langerhans' secrete 'Pancreatic Polypeptide' from which cells

A
Alpha cells
B
Beta cells
C
PP cells (or F cells)
D
Delta cells

Answer & Explanation

Correct Option: C

F cells (PP cells) regulate pancreatic secretions and glycogen levels in the liver.
Question 533 Discuss
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Which of the following is an example of 'Bio-magnification' in an aquatic ecosystem

A
Increase in water level
B
Accumulation of DDT in fish-eating birds
C
Increase in fish population
D
Depletion of minerals

Answer & Explanation

Correct Option: B

Toxicants like DDT increase in concentration at each trophic level, reaching highest levels in top predators.
Question 534 Discuss
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Identify the 'Correct' sequence of bones in the human middle ear from outside to inside

A
Stapes Incus Malleus
B
Malleus Incus Stapes
C
Incus Malleus Stapes
D
Stapes Malleus Incus

Answer & Explanation

Correct Option: B

Malleus (hammer) is attached to the eardrum, followed by Incus (anvil) and Stapes (stirrup).
Question 535 Discuss
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Which enzyme is responsible for the 'Fixation' of CO2 in C3 plants

A
PEP Carboxylase
B
RuBisCO
C
Hexokinase
D
Pyruvate kinase

Answer & Explanation

Correct Option: B

RuBisCO (Ribulose-1,5-bisphosphate carboxylase/oxygenase) is the most abundant enzyme on Earth.
Question 536 Discuss
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The 'Vagus Nerve' (Cranial nerve X) is primarily responsible for

A
Sense of smell
B
Vision
C
Parasympathetic control of heart and digestive tract
D
Facial expressions

Answer & Explanation

Correct Option: C

The vagus nerve is the longest cranial nerve and is key to the 'rest and digest' system.
Question 537 Discuss
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Which of the following is a 'Polysaccharide' found in the exoskeletons of insects

A
Cellulose
B
Starch
C
Chitin
D
Glycogen

Answer & Explanation

Correct Option: C

Chitin is a structural polysaccharide composed of N-acetylglucosamine units.
Question 538 Discuss
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Which of the following is a 'Cyanobacterium' (Blue-green algae) used as a bio-fertilizer in paddy fields

A
Spirogyra
B
Anabaena
C
Chlamydomonas
D
Ulothrix

Answer & Explanation

Correct Option: B

Anabaena and Nostoc can fix atmospheric nitrogen in specialized cells called heterocysts.
Question 539 Discuss
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In the process of 'Fermentation' in muscle cells the end product is

A
Ethanol and CO2
B
Lactic acid and ATP
C
Pyruvate and Water
D
Glucose and Oxygen

Answer & Explanation

Correct Option: B

Lactic acid fermentation occurs when oxygen is limited, causing the localized drop in pH that leads to fatigue.
Question 540 Discuss
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The 'Genetic' code is said to be 'Degenerate' because

A
One codon codes for many amino acids
B
One amino acid can be coded by more than one codon
C
The code is not the same for all organisms
D
It changes over time

Answer & Explanation

Correct Option: B

Since there are 61 coding codons for only 20 amino acids, most amino acids have multiple 'synonymous' codons.
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