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Biology 1525 MCQs [All-Courses]

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Biology covers key concepts of life, organisms, and human systems with exam-focused notes for PPSC, FPSC, KPPSC, BPSC.,NTS, OTS, AJKPSC. Clear, concise topics help students prepare effectively for competitive tests.

All Topics  1525

In an annelids, the contraction of circular muscle results in___________?

A Lengthening of the body.
B Shortening of the body.
C Widening of body
D Thinning of body
Correct Answer: Thinning of body

Diameter of thick filament is____________?

A 7 nm.
B 8 nm
C 16nm
D 10-100 ?m.
Correct Answer: 16nm

Which of the following animal has a hydrostatic skeleton?

A Earthworm
B Round worm
C Tape worm
D Pin worm
Correct Answer: Earthworm

A smallest contractile unit of muscle contraction called sarcomere is the area between two:

A H- zone
B M- Line
C Z- Line
D A band
Correct Answer: Z- Line

Gibberellins is an example of_________________?

A Growth inhibitor
B Growth stimulator
C Growth hormone
D None of these
Correct Answer: Growth stimulator

Which of the following statements is incorrect about skeletal muscle fibers?

A They are multinucleated.
B They are 10 – 100 ?m in diameter & surrounded by sarcolemma
C They contain O2 storing molecules called hemoglobin.
D Their cytoplasm contains high concentration of carbohydrates
Correct Answer: They contain O2 storing molecules called hemoglobin.

Epinasty is controlled by_____________?

A Gibberellins
B Abscisins
C Auxins
D Cytokinins
Correct Answer: Auxins

Why skeletal muscles are called striated muscles?

A They appear darker than smooth muscles by naked eye.
B Alternating dark and light bands appear on their surface when visualized by naked eye.
C Alternating dark and light bands appear on their surface when visualized via a microscope.
D All of these
Correct Answer: Alternating dark and light bands appear on their surface when visualized via a microscope.

Roots of a plant show______________?

A Positive phototropism and negative geotropism
B Negative phototropism and positive geotropism
C Negative tactic movement and positive tropic movement
D Positive geotropism of stem and roots
Correct Answer: Negative phototropism and positive geotropism

The contraction of which of the following muscle fibers, is controlled by hormones?

A A smooth muscle
B A cardiac muscle
C A skeletal muscle.
D All of these
Correct Answer: A smooth muscle
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