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 481 Discuss
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Which of the following describes the 'Lamarckian' theory of evolution

A
Natural selection of favorable traits
B
Inheritance of acquired characters
C
Mutation as a driver of species change
D
Genetic drift in small populations

Answer & Explanation

Correct Option: B

Lamarck proposed that organs used frequently become stronger and are inherited by offspring.
Question 482 Discuss
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The 'Blood Pressure' is the pressure exerted by the blood against the walls of

A
Veins only
B
Arteries only
C
Capillaries only
D
Both arteries and veins

Answer & Explanation

Correct Option: B

Clinically, BP refers to systemic arterial pressure unless otherwise specified.
Question 483 Discuss
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Identify the 'Primary' site of gaseous exchange in humans

A
Trachea
B
Bronchi
C
Alveoli
D
Nostrils

Answer & Explanation

Correct Option: C

Gas exchange occurs across the thin respiratory membrane of the alveoli and their surrounding capillaries.
Question 484 Discuss
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Which enzyme is used to 'Join' DNA fragments together

A
DNA Ligase
B
Restriction Endonuclease
C
DNA Polymerase
D
Helicase

Answer & Explanation

Correct Option: A

DNA ligase facilitates the joining of DNA strands by catalyzing the formation of phosphodiester bonds.
Question 485 Discuss
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The 'Poliomyelitis' vaccine was first developed by

A
Edward Jenner
B
Jonas Salk
C
Louis Pasteur
D
Alexander Fleming

Answer & Explanation

Correct Option: B

Jonas Salk developed the inactivated polio vaccine (IPV) in 1955; Albert Sabin later developed the oral vaccine.
Question 486 Discuss
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Which of the following is a 'Unicellular' fungus

A
Mushroom
B
Yeast
C
Bread Mold
D
Penicillium

Answer & Explanation

Correct Option: B

While most fungi are multicellular, yeast is a single-celled eukaryote.
Question 487 Discuss
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The 'Bending' of a plant shoot towards light is due to the accumulation of Auxin on which side

A
Side facing the light
B
Side away from the light (shaded side)
C
Equally on both sides
D
Only at the very tip

Answer & Explanation

Correct Option: B

Auxin stimulates cell elongation on the shaded side, causing the plant to curve toward the light source.
Question 488 Discuss
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Which part of the human brain maintains 'Homeostasis' and body temperature

A
Cerebellum
B
Hypothalamus
C
Thalamus
D
Pons

Answer & Explanation

Correct Option: B

The hypothalamus acts as the body's thermostat and regulates hunger, thirst, and sleep.
Question 489 Discuss
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Identify the 'Primary' pollutant in smog that causes eye irritation

A
Nitrogen Gas
B
PAN (Peroxyacetyl Nitrate)
C
Carbon Monoxide
D
Argon

Answer & Explanation

Correct Option: B

PAN is a secondary pollutant found in photochemical smog and is a powerful eye irritant.
Question 490 Discuss
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Which among the following is 'NOT' a part of a standard nucleotide

A
Nitrogenous base
B
Pentose sugar
C
Phosphate group
D
Amino acid

Answer & Explanation

Correct Option: D

Nucleotides are monomers of nucleic acids; amino acids are monomers of proteins.
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