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 441 Discuss
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The 'Islets of Langerhans' contain which cells for secreting Glucagon

A
Beta cells
B
Alpha cells
C
Delta cells
D
Gamma cells

Answer & Explanation

Correct Option: B

Alpha cells secrete glucagon (raises blood sugar), whereas Beta cells secrete insulin (lowers blood sugar).
Question 442 Discuss
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Which among the following is a 'Complete' parasite

A
Loranthus
B
Viscum
C
Cuscuta (Dodder)
D
Santalum

Answer & Explanation

Correct Option: C

Cuscuta lacks chlorophyll and depends entirely on the host for both water and nutrients.
Question 443 Discuss
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The 'Blood-Brain Barrier' (BBB) is primarily composed of which type of cells

A
Neurons
B
Astrocytes and specialized capillaries
C
Schwann cells
D
Microglia

Answer & Explanation

Correct Option: B

Astrocytes help maintain the tight junctions in the brain's capillary walls to protect the brain from toxins.
Question 444 Discuss
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Which of the following hormones is known as 'Birth Hormone' and 'Milk Let-down' hormone

A
Prolactin
B
Oxytocin
C
Vasopressin
D
Relaxin

Answer & Explanation

Correct Option: B

Oxytocin stimulates uterine contractions and the release of milk from the mammary glands.
Question 445 Discuss
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Which 'Enzyme' is used in the industry to dissolve blood clots

A
Streptokinase
B
Cyclosporin A
C
Statins
D
Lipase

Answer & Explanation

Correct Option: A

Streptokinase is a 'clot buster' used for patients who have undergone myocardial infarction.
Question 446 Discuss
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In the human skeletal system the 'Hinge Joint' is found in

A
Shoulder
B
Elbow and Knee
C
Neck
D
Wrist

Answer & Explanation

Correct Option: B

Hinge joints allow movement in only one plane, similar to a door hinge.
Question 447 Discuss
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The 'Widal Test' is used for the diagnosis of

A
Tuberculosis
B
Cholera
C
Typhoid
D
Malaria

Answer & Explanation

Correct Option: C

The Widal test detects agglutinating antibodies against Salmonella typhi, the cause of typhoid fever.
Question 448 Discuss
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Which part of the 'Nephron' is impermeable to water

A
Descending limb of Loop of Henle
B
Ascending limb of Loop of Henle
C
Collecting duct
D
Proximal tubule

Answer & Explanation

Correct Option: B

The ascending limb is impermeable to water but allows the transport of electrolytes.
Question 449 Discuss
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Which of the following is a 'Nitrogen-Fixing' free-living aerobic bacterium

A
Rhizobium
B
Azotobacter
C
Clostridium
D
Anabaena

Answer & Explanation

Correct Option: B

Azotobacter can fix nitrogen independently in the soil, unlike Rhizobium which requires a root nodule.
Question 450 Discuss
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The 'Double Helix' model of DNA suggests that the two strands are

A
Parallel and identical
B
Antiparallel and complementary
C
Single stranded and linear
D
Coiled but not bonded

Answer & Explanation

Correct Option: B

Strands run in opposite directions (5' to 3' and 3' to 5') and pair base-to-base (A-T, G-C).
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