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 501 Discuss
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The 'Kranz Anatomy' is a characteristic feature of leaves in which group of plants

A
C3 plants
B
C4 plants
C
CAM plants
D
Hydrophytes

Answer & Explanation

Correct Option: B

Kranz anatomy involves bundle sheath cells arranged like a wreath, optimizing CO2 fixation in plants like maize and sugarcane.
Question 502 Discuss
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Identify the hormone that stimulates the 'Contraction' of the gallbladder to release bile

A
Gastrin
B
Secretin
C
Cholecystokinin (CCK)
D
Enterogastrone

Answer & Explanation

Correct Option: C

CCK is secreted by the duodenum in response to fats, triggering gallbladder contraction and pancreatic enzyme secretion.
Question 503 Discuss
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Which specific part of the human 'Brain' is affected first in Alzheimer's disease

A
Medulla
B
Hippocampus
C
Pons
D
Thalamus

Answer & Explanation

Correct Option: B

The hippocampus is critical for memory formation, and its damage leads to the characteristic forgetfulness of Alzheimer's.
Question 504 Discuss
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The 'Pneumotaxic Center' which can moderate the functions of the respiratory rhythm center is located in

A
Medulla oblongata
B
Pons varolii
C
Cerebellum
D
Midbrain

Answer & Explanation

Correct Option: B

The pneumotaxic center in the pons limits inspiration, thereby regulating the respiratory rate.
Question 505 Discuss
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Identify the 'Protozoan' disease transmitted by the bite of a Sandfly

A
Malaria
B
Sleeping Sickness
C
Kala-azar
D
Giardiasis

Answer & Explanation

Correct Option: C

Kala-azar (Visceral Leishmaniasis) is caused by Leishmania parasites and spread by sandflies.
Question 506 Discuss
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In the human circulatory system the 'Left Ventricle' has thicker walls than the 'Right Ventricle' because

A
It needs to pump blood to the entire body against high resistance
B
It contains more deoxygenated blood
C
It is larger in size than the right ventricle
D
It receives blood directly from the lungs

Answer & Explanation

Correct Option: A

The left ventricle provides the force for systemic circulation, requiring significantly more muscular power.
Question 507 Discuss
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Which of the following is a 'Second Messenger' in cellular signal transduction

A
Insulin
B
cAMP (Cyclic AMP)
C
Thyroxine
D
Glucose

Answer & Explanation

Correct Option: B

Second messengers like cAMP or Ca2+ relay signals from surface receptors to the cell's interior.
Question 508 Discuss
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The 'Hepatopancreatic duct' opens into the duodenum and is guarded by the

A
Pyloric sphincter
B
Sphincter of Oddi
C
Cardiac sphincter
D
Ileocaecal valve

Answer & Explanation

Correct Option: B

The Sphincter of Oddi controls the flow of bile and pancreatic juice into the small intestine.
Question 509 Discuss
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Identify the 'Tricky' mineral element required for the photolysis of water during photosynthesis

A
Magnesium
B
Manganese
C
Zinc
D
Copper

Answer & Explanation

Correct Option: B

Manganese (Mn) and Chlorine (Cl) ions are essential for the Oxygen Evolving Complex in thylakoids.
Question 510 Discuss
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Which of the following diseases is characterized by the inflammation of the joints due to accumulation of 'Uric Acid' crystals

A
Osteoarthritis
B
Rheumatoid arthritis
C
Gout
D
Osteoporosis

Answer & Explanation

Correct Option: C

Gout is a metabolic disorder where high blood uric acid leads to crystal deposits in joints, causing pain.
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