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Question (1)

QN0029233

A student observes a single-celled organism under a microscope that can perform digestion, respiration, and movement on its own. The organism is most likely:

(A) Human cell
(B) Amoeba
(C) Leaf tissue
(D) Muscle organ

Correct Answer: B

Explanation:

Amoeba is a unicellular organism capable of performing all life processes independently.

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Question (2)

QN0029234

Which structure mainly controls the entry and exit of substances in a cell?

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

Correct Answer: C

Explanation:

The cell membrane regulates movement of materials.

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Question (3)

QN0029235

A scientist counts 150 cells in a sample. If each cell divides once, how many cells will be present afterward?

(A) 150
(B) 225
(C) 300
(D) 450

Correct Answer: C

Explanation:

150 × 2 = 300.

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Question (4)

QN0029236

Which of the following correctly represents the order of organisation in the human body?

(A) Organ → Cell → Tissue → Organ system
(B) Cell → Tissue → Organ → Organ system
(C) Tissue → Cell → Organ system → Organ
(D) Organ system → Tissue → Cell → Organ

Correct Answer: B

Explanation:

Cells form tissues, tissues form organs, and organs form organ systems.

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Question (5)

QN0029237

Bread dough rises after some time mainly because yeast produces:

(A) oxygen
(B) hydrogen
(C) carbon dioxide
(D) nitrogen

Correct Answer: C

Explanation:

Carbon dioxide released by yeast makes the dough fluffy.

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Question (6)

QN0029238

Which microorganism helps in increasing nitrogen content in soil?

(A) Amoeba
(B) Rhizobium
(C) Virus
(D) Mushroom

Correct Answer: B

Explanation:

Rhizobium fixes atmospheric nitrogen.

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Question (7)

QN0029239

If one yeast cell doubles every hour, how many yeast cells will form after 6 hours starting from one cell?

(A) 16
(B) 32
(C) 64
(D) 128

Correct Answer: C

Explanation:

1 → 2 → 4 → 8 → 16 → 32 → 64.

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Question (8)

QN0029240

Which of the following is found in both plant and animal cells?

(A) Cell wall
(B) Chloroplast
(C) Nucleus
(D) Large vacuole only

Correct Answer: C

Explanation:

Both plant and animal cells contain a nucleus.

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Question (9)

QN0029241

A tissue is best defined as a group of:

(A) organs working together
(B) similar cells performing a common function
(C) organ systems
(D) microorganisms living together

Correct Answer: B

Explanation:

Similar cells combine to form tissues.

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Question (10)

QN0029242

Which statement correctly explains why cells are called structural units of life?

(A) Cells produce only energy
(B) All organisms are built from cells
(C) Cells are present only in animals
(D) Cells are visible without instruments

Correct Answer: B

Explanation:

Cells form the structure of all living organisms.

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Question (1)

A student observes a single-celled organism under a microscope that can perform digestion, respiration, and movement on its own. The organism is most likely:

Explanation:

Link:

Question (2)

Which structure mainly controls the entry and exit of substances in a cell?

Explanation:

Link:

Question (3)

A scientist counts 150 cells in a sample. If each cell divides once, how many cells will be present afterward?

Explanation:

Link:

Question (4)

Which of the following correctly represents the order of organisation in the human body?

Explanation:

Link:

Question (5)

Bread dough rises after some time mainly because yeast produces:

Explanation:

Link:

Question (6)

Which microorganism helps in increasing nitrogen content in soil?

Explanation:

Link:

Question (7)

If one yeast cell doubles every hour, how many yeast cells will form after 6 hours starting from one cell?

Explanation:

Link:

Question (8)

Which of the following is found in both plant and animal cells?

Explanation:

Link:

Question (9)

A tissue is best defined as a group of:

Explanation:

Link:

Question (10)

Which statement correctly explains why cells are called structural units of life?

Explanation:

Link:

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