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 451 Discuss
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Which of the following describes 'Biological Control' of pests

A
Using chemical pesticides frequently
B
Using natural predators and parasites to manage pest populations
C
Manually removing pests from crops
D
Using genetically modified pest-resistant crops

Answer & Explanation

Correct Option: B

Bio-control is an eco-friendly method using organisms like ladybugs to eat aphids.
Question 452 Discuss
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The deficiency of which 'Vitamin' causes Pernicious Anemia

A
Vitamin B6
B
Vitamin B12
C
Vitamin B1
D
Vitamin B2

Answer & Explanation

Correct Option: B

Lack of Vitamin B12 (Cobalamin) leads to the production of large, immature RBCs.
Question 453 Discuss
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Identify the 'Excretory' organ in the Earthworm

A
Malpighian tubules
B
Nephridia
C
Flame cells
D
Kidneys

Answer & Explanation

Correct Option: B

Earthworms use tubular structures called nephridia to remove nitrogenous waste and maintain fluid balance.
Question 454 Discuss
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Which among the following is an example of 'Active Immunity'

A
Antibodies passed from mother to child
B
Injection of Antivenom after snake bite
C
Immunity developed after vaccination
D
Injection of readymade antibodies for Hepatitis

Answer & Explanation

Correct Option: C

Active immunity is produced when the person's own immune cells respond to an antigen (via infection or vaccine).
Question 455 Discuss
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What is the primary role of 'Ribosomes' in the cell

A
ATP production
B
Protein synthesis
C
Lipid storage
D
Digestive enzyme secretion

Answer & Explanation

Correct Option: B

Ribosomes translate mRNA into polypeptide chains, the building blocks of proteins.
Question 456 Discuss
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Which of the following is 'NOT' a part of the male reproductive system in humans

A
Epididymis
B
Vas deferens
C
Fallopian Tube
D
Prostate gland

Answer & Explanation

Correct Option: C

Fallopian tubes (oviducts) are part of the female reproductive system where fertilization occurs.
Question 457 Discuss
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The 'Islets of Langerhans' secrete Insulin from which cells

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

Answer & Explanation

Correct Option: B

Beta cells are the most numerous cells in the islets and are responsible for regulating glucose levels.
Question 458 Discuss
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In a plant 'Xylem' is responsible for the transport of

A
Water and minerals only
B
Food and minerals
C
Water and food
D
Hormones only

Answer & Explanation

Correct Option: A

Xylem sap consists of water and inorganic ions moved from roots to leaves via transpiration pull.
Question 459 Discuss
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The 'Acid Rain' is primarily caused by the atmospheric presence of

A
CO and CO2
B
SO2 and NO2
C
CH4 and CFCs
D
Ozone and Oxygen

Answer & Explanation

Correct Option: B

Sulfur and Nitrogen oxides react with water vapor to form sulfuric and nitric acids.
Question 460 Discuss
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Which of the following enzymes is responsible for 'Nitrogen Fixation' in Rhizobium

A
Nitratase
B
Nitrogenase
C
Ammoniase
D
Denitrificase

Answer & Explanation

Correct Option: B

Nitrogenase is an oxygen-sensitive enzyme that catalyzes the reduction of atmospheric N2 to NH3.
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