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 421 Discuss
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Which among the following is a 'Fossil Fuel' but originated from biological remains

A
Uranium
B
Coal
C
Bauxite
D
Iron Ore

Answer & Explanation

Correct Option: B

Coal is formed from the remains of ancient plant matter under high pressure and temperature over millions of years.
Question 422 Discuss
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The 'Nodes of Ranvier' are found in which part of the neuron

A
Cell body
B
Dendrites
C
Axon
D
Synapse

Answer & Explanation

Correct Option: C

Nodes of Ranvier are gaps in the myelin sheath where saltatory conduction of nerve impulses occurs.
Question 423 Discuss
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Identify the primary site of 'Hematopoiesis' (blood cell formation) in an adult human

A
Spleen
B
Liver
C
Red Bone Marrow
D
Thymus

Answer & Explanation

Correct Option: C

In adults, all types of blood cells are produced in the red bone marrow found in flat bones.
Question 424 Discuss
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Which phytohormone is often called the 'Stress Hormone' in plants

A
Auxin
B
Gibberellin
C
Abscisic Acid
D
Cytokinin

Answer & Explanation

Correct Option: C

ABA levels rise during drought, signaling stomatal closure to conserve water.
Question 425 Discuss
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The 'Endosymbiotic Theory' suggests that Mitochondria evolved from

A
Free-living aerobic bacteria
B
Cyanobacteria
C
Viruses
D
Fungi

Answer & Explanation

Correct Option: A

This theory posits that aerobic bacteria were engulfed by primitive eukaryotic cells and became mitochondria.
Question 426 Discuss
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Which of the following is a symptom of 'Ariboflavinosis'

A
Night blindness
B
Bleeding gums
C
Cracking at the corners of the mouth (Cheilosis)
D
Pellagra

Answer & Explanation

Correct Option: C

Ariboflavinosis is a deficiency of Vitamin B2 (Riboflavin), leading to sores on the lips and mouth.
Question 427 Discuss
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The 'Glomerular Filtration Rate' (GFR) in a healthy human adult is approximately

A
125 ml/min
B
500 ml/min
C
1000 ml/min
D
50 ml/min

Answer & Explanation

Correct Option: A

The kidneys filter approximately 180 liters of blood per day, resulting in a GFR of 125 ml/min.
Question 428 Discuss
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In the context of the environment what does 'Eutrophication' refer to

A
Depletion of oxygen in water due to chemical pollutants
B
Nutrient enrichment of water bodies leading to algal bloom
C
Increase in water temperature due to global warming
D
Acidification of water bodies by acid rain

Answer & Explanation

Correct Option: B

Excessive nitrates and phosphates cause rapid algae growth, which eventually depletes oxygen as the algae decompose.
Question 429 Discuss
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Which hormone regulates the 'Calcium' level in the blood by increasing it

A
Calcitonin
B
Parathyroid Hormone
C
Thyroxine
D
Insulin

Answer & Explanation

Correct Option: B

PTH increases blood calcium by stimulating bone resorption and calcium reabsorption in the kidneys.
Question 430 Discuss
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In humans the 'Fovea Centralis' is the region of the retina where

A
Only rod cells are present
B
The optic nerve exits the eye
C
Visual acuity is highest due to high cone density
D
The image is always inverted

Answer & Explanation

Correct Option: C

The fovea is a small pit in the macula that provides the sharpest detail in the visual field.
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