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Question (1)

QN002841

Which instrument helped scientists observe tiny living structures that cannot be seen with naked eyes?

(A) Telescope
(B) Thermometer
(C) Microscope
(D) Barometer

Correct Answer: C

Explanation:

A microscope magnifies tiny objects and makes them visible.

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Question (2)

QN002842

Robert Hooke observed cork cells using a microscope that magnified objects approximately:

(A) 20–30 times
(B) 50–100 times
(C) 200–300 times
(D) 500–700 times

Correct Answer: C

Explanation:

Robert Hooke’s microscope magnified objects about 200–300 times.

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Question (3)

QN002843

Why did Robert Hooke name the tiny compartments in cork as “cells”?

(A) They looked circular
(B) They resembled honeycomb-like rooms
(C) They were filled with liquid
(D) They changed shape continuously

Correct Answer: B

Explanation:

The tiny spaces resembled honeycomb-like rooms called cells.

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Question (4)

QN002844

Antonie van Leeuwenhoek is known as the:

(A) Father of Genetics
(B) Father of Botany
(C) Father of Microbiology
(D) Father of Ecology

Correct Answer: C

Explanation:

Antonie van Leeuwenhoek is called the Father of Microbiology.

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Question (5)

QN002845

During the onion peel experiment, safranin stain is added mainly to:

(A) increase the size of cells
(B) improve visibility of cell structures
(C) stop cell movement
(D) remove water from cells

Correct Answer: B

Explanation:

Safranin improves visibility by staining the cells.

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Question (6)

QN002846

A student forgot to add glycerin while preparing the onion peel slide. Which problem is most likely to occur?

(A) Cells become green
(B) Cells dry quickly
(C) Cells divide rapidly
(D) Cells become larger

Correct Answer: B

Explanation:

Glycerin prevents the cells from drying.

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Question (7)

QN002847

Which sequence correctly represents the steps while preparing an onion peel slide?

(A) Staining → washing → mounting → coverslip
(B) Coverslip → staining → washing → mounting
(C) Washing → staining → removing peel → mounting
(D) Mounting → staining → coverslip → washing

Correct Answer: A

Explanation:

The onion peel is stained, washed, mounted, and then covered.

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Question (8)

QN002848

In the onion peel experiment, the coverslip is placed carefully to avoid:

(A) loss of colour
(B) breaking of microscope
(C) trapping of air bubbles
(D) formation of chlorophyll

Correct Answer: C

Explanation:

Air bubbles interfere with clear observation.

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Question (9)

QN002849

Onion peel cells appear closely packed mainly because plant cells possess:

(A) vacuoles
(B) chloroplasts
(C) cell wall
(D) nucleus

Correct Answer: C

Explanation:

Cell walls provide rigidity and compact arrangement.

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Question (10)

QN002850

Which structure controls and regulates all activities of a cell?

(A) Cytoplasm
(B) Cell membrane
(C) Nucleus
(D) Vacuole

Correct Answer: C

Explanation:

The nucleus regulates all activities of the cell.

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Question (1)

Which instrument helped scientists observe tiny living structures that cannot be seen with naked eyes?

Explanation:

Link:

Question (2)

Robert Hooke observed cork cells using a microscope that magnified objects approximately:

Explanation:

Link:

Question (3)

Why did Robert Hooke name the tiny compartments in cork as “cells”?

Explanation:

Link:

Question (4)

Antonie van Leeuwenhoek is known as the:

Explanation:

Link:

Question (5)

During the onion peel experiment, safranin stain is added mainly to:

Explanation:

Link:

Question (6)

A student forgot to add glycerin while preparing the onion peel slide. Which problem is most likely to occur?

Explanation:

Link:

Question (7)

Which sequence correctly represents the steps while preparing an onion peel slide?

Explanation:

Link:

Question (8)

In the onion peel experiment, the coverslip is placed carefully to avoid:

Explanation:

Link:

Question (9)

Onion peel cells appear closely packed mainly because plant cells possess:

Explanation:

Link:

Question (10)

Which structure controls and regulates all activities of a cell?

Explanation:

Link:

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