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 371 Discuss
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The genetic condition 'Down Syndrome' is characterized by the presence of an extra copy of which chromosome

A
Chromosome 18
B
Chromosome 21
C
Chromosome 13
D
X Chromosome

Answer & Explanation

Correct Option: B

Down syndrome is also called Trisomy 21, where there are three copies of chromosome 21 instead of two.
Question 372 Discuss
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In a food chain what is the role of 'Decomposers'

A
To convert light energy into chemical energy
B
To recycle nutrients by breaking down organic matter
C
To provide energy to the primary consumers
D
To regulate the population of top predators

Answer & Explanation

Correct Option: B

Decomposers like fungi and bacteria return essential elements to the soil by breaking down dead organisms.
Question 373 Discuss
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Which of the following is a 'Water Soluble' vitamin

A
Vitamin A
B
Vitamin D
C
Vitamin C
D
Vitamin E

Answer & Explanation

Correct Option: C

Vitamins B and C are water-soluble, while A, D, E, and K are fat-soluble.
Question 374 Discuss
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The 'Resting Membrane Potential' of a neuron is primarily maintained by the

A
Sodium-Potassium Pump
B
Calcium channels
C
Neurotransmitters in the synapse
D
Myelin sheath

Answer & Explanation

Correct Option: A

The Na+/K+ ATPase pump exports 3 Na+ and imports 2 K+, maintaining the negative charge inside the cell.
Question 375 Discuss
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The 'Lock and Key' hypothesis of enzyme action was proposed by

A
Daniel Koshland
B
Emil Fischer
C
Robert Brown
D
Louis Pasteur

Answer & Explanation

Correct Option: B

Emil Fischer proposed that the substrate fits into the enzyme like a key into a lock.
Question 376 Discuss
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Which of the following is an example of 'Ex-situ' conservation of biodiversity

A
National Parks
B
Wildlife Sanctuaries
C
Seed Banks
D
Biosphere Reserves

Answer & Explanation

Correct Option: C

Ex-situ conservation involves protecting a species outside its natural habitat, such as in zoos or seed banks.
Question 377 Discuss
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Which hormone is commonly used to induce 'Parthenocarpy' or seedless fruit production

A
Auxins
B
Gibberellins
C
Ethylene
D
Abscisic Acid

Answer & Explanation

Correct Option: B

Gibberellins are often applied to crops like grapes to produce larger, seedless fruits.
Question 378 Discuss
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The 'Bohr Effect' explains how hemoglobin's affinity for oxygen is reduced by

A
High blood pH
B
Decreased CO2 levels
C
Increase in acidity or CO2 concentration
D
Decreased temperature

Answer & Explanation

Correct Option: C

In tissues with high metabolic activity, higher CO2 and H+ levels trigger the release of oxygen from hemoglobin.
Question 379 Discuss
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Which among the following is the 'Structural unit' of a Muscle Fiber

A
Myofibril
B
Sarcomere
C
Sarcolemma
D
Fascicle

Answer & Explanation

Correct Option: B

The sarcomere is the segment between two Z-lines and is the basic functional unit of muscle contraction.
Question 380 Discuss
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In the human eye 'Night Blindness' is caused by the deficiency of which light-sensitive pigment

A
Iodopsin
B
Rhodopsin
C
Melatonin
D
Hemoglobin

Answer & Explanation

Correct Option: B

Rhodopsin is found in rod cells and is essential for vision in low-light conditions; it requires Vitamin A for synthesis.
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