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Question (1)

QN007559

What is the limit of resolution of the human eye?

(A) 1 mm
(B) 0.1 mm
(C) 10 mm
(D) 0.01 mm

Correct Answer: B

Explanation:

The limit of resolution of the human eye is 0.1 mm.

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Question (2)

QN007560

Which scientist first observed cells using a self-designed microscope in 1665?

(A) Rudolf Virchow
(B) Matthias Schleiden
(C) Robert Hooke
(D) Theodor Schwann

Correct Answer: C

Explanation:

Robert Hooke first observed cells in cork.

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Question (3)

QN007561

If an eyepiece lens has magnification 10X and the objective lens also has magnification 10X, what will be the total magnification?

(A) 20X
(B) 10X
(C) 100X
(D) 1000X

Correct Answer: C

Explanation:

Total magnification = 10 × 10 = 100X.

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Question (4)

QN007562

A microscope field of view is 4000 µm wide. If 20 onion cells fit along the diameter, what is the approximate size of one onion cell?

(A) 20 µm
(B) 40 µm
(C) 200 µm
(D) 400 µm

Correct Answer: C

Explanation:

Cell size = 4000 ÷ 20 = 200 µm.

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Question (5)

QN007563

Which feature of a microscope refers to the measure of clarity of an image?

(A) Contrast
(B) Magnification
(C) Resolution
(D) Rotation

Correct Answer: C

Explanation:

Resolution refers to image clarity.

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Question (6)

QN007564

Electron microscopes use which of the following to produce highly magnified images?

(A) Gamma rays
(B) Light rays
(C) Sound waves
(D) Electron beams

Correct Answer: D

Explanation:

Electron microscopes use electron beams.

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Question (7)

QN007565

The movement of water through a selectively permeable membrane is called:

(A) Diffusion
(B) Osmosis
(C) Respiration
(D) Transpiration

Correct Answer: B

Explanation:

Osmosis is movement of water through a selectively permeable membrane.

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Question (8)

QN007566

Diffusion is correctly defined as:

(A) Movement of water only through membrane
(B) Movement of particles from lower to higher concentration
(C) Net movement of particles from higher to lower concentration
(D) Movement of solute through membrane only

Correct Answer: C

Explanation:

Diffusion occurs from higher to lower concentration.

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Question (9)

QN007567

A potato piece placed in plain water swells because:

(A) Salt enters the cells
(B) Water moves out of the cells
(C) Water enters the cells by osmosis
(D) Starch is formed inside cells

Correct Answer: C

Explanation:

Water enters potato cells through osmosis.

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Question (10)

QN007568

A plant cell placed in a hypertonic solution will most likely:

(A) Burst
(B) Remain unchanged
(C) Gain water rapidly
(D) Lose water and shrink internally

Correct Answer: D

Explanation:

Water moves out of the cell in a hypertonic solution.

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Question (1)

What is the limit of resolution of the human eye?

Explanation:

Link:

Question (2)

Which scientist first observed cells using a self-designed microscope in 1665?

Explanation:

Link:

Question (3)

If an eyepiece lens has magnification 10X and the objective lens also has magnification 10X, what will be the total magnification?

Explanation:

Link:

Question (4)

A microscope field of view is 4000 µm wide. If 20 onion cells fit along the diameter, what is the approximate size of one onion cell?

Explanation:

Link:

Question (5)

Which feature of a microscope refers to the measure of clarity of an image?

Explanation:

Link:

Question (6)

Electron microscopes use which of the following to produce highly magnified images?

Explanation:

Link:

Question (7)

The movement of water through a selectively permeable membrane is called:

Explanation:

Link:

Question (8)

Diffusion is correctly defined as:

Explanation:

Link:

Question (9)

A potato piece placed in plain water swells because:

Explanation:

Link:

Question (10)

A plant cell placed in a hypertonic solution will most likely:

Explanation:

Link:

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