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Question (1)

QN0036122

Which statement best explains why reproduction is important for the continuity of a species?

(A) It helps an individual organism obtain food
(B) It replaces organisms that die and maintains the population
(C) It increases the size of individual cells
(D) It prevents all variations in organisms

Correct Answer: B

Explanation:

Reproduction maintains the continuity of a species by producing new individuals.

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Question (2)

QN0036123

A DNA-copying process produces two cells that are similar but not completely identical. What is the most appropriate explanation?

(A) DNA has no role in inheritance
(B) DNA copying is a completely random process
(C) Biochemical reactions involved in DNA copying are not absolutely accurate
(D) Cellular apparatus destroys part of the DNA

Correct Answer: C

Explanation:

DNA copying is not absolutely accurate, so small variations can arise.

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Question (3)

QN0036124

A population of bacteria is living comfortably at 25°C. The temperature suddenly rises to 40°C. Which population is most likely to survive?

(A) A population in which every bacterium is genetically identical
(B) A population containing some heat-resistant variants
(C) A population having no DNA
(D) A population in which DNA copying never occurs

Correct Answer: B

Explanation:

Heat-resistant variants may survive when environmental temperature increases.

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Question (4)

QN0036125

Which of the following correctly matches the organism with its mode of asexual reproduction?

(A) Amoeba — budding
(B) Yeast — budding
(C) Plasmodium — fragmentation
(D) Spirogyra — multiple fission

Correct Answer: B

Explanation:

Yeast reproduces asexually by forming small buds.

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Question (5)

QN0036126

An organism divides into two daughter cells, but the division can occur in almost any plane. Which organism is most likely being described?

(A) Leishmania
(B) Amoeba
(C) Plasmodium
(D) Yeast

Correct Answer: B

Explanation:

Amoeba can undergo binary fission in any plane.

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Question (6)

QN0036127

A unicellular organism divides to produce many daughter cells simultaneously. Which process is involved?

(A) Binary fission
(B) Budding
(C) Multiple fission
(D) Regeneration

Correct Answer: C

Explanation:

Multiple fission produces many daughter cells simultaneously.

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Question (7)

QN0036128

A student observes a microorganism having a whip-like structure at one end. Its cell division occurs in a definite orientation related to this structure. Which organism could it be?

(A) Amoeba
(B) Leishmania
(C) Yeast
(D) Spirogyra

Correct Answer: B

Explanation:

Leishmania has a whip-like structure and undergoes binary fission in a definite orientation.

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Question (8)

QN0036129

A piece of Spirogyra breaks into four fragments and each fragment develops into a complete organism. Which process is illustrated?

(A) Budding
(B) Fragmentation
(C) Multiple fission
(D) Pollination

Correct Answer: B

Explanation:

Spirogyra reproduces by fragmentation when its filament breaks into pieces.

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Question (9)

QN0036130

Why can simple cell-by-cell division not normally produce new individuals in highly organised multicellular organisms?

(A) Their cells contain no DNA
(B) Their cells cannot divide
(C) Their cells are specialised and arranged into tissues and organs
(D) Their cells are always dead

Correct Answer: C

Explanation:

Specialised cells form organised tissues and organs, so simple cell-by-cell division is impractical.

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Question (10)

QN0036131

A planarian is cut into several pieces, and each piece develops into a complete organism. Which statement is correct?

(A) This is always the normal reproductive method of Planaria
(B) This demonstrates regeneration
(C) This is binary fission
(D) This is sexual reproduction

Correct Answer: B

Explanation:

Regeneration allows pieces of Planaria to develop into complete organisms.

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Question (1)

Which statement best explains why reproduction is important for the continuity of a species?

Explanation:

Link:

Question (2)

A DNA-copying process produces two cells that are similar but not completely identical. What is the most appropriate explanation?

Explanation:

Link:

Question (3)

A population of bacteria is living comfortably at 25°C. The temperature suddenly rises to 40°C. Which population is most likely to survive?

Explanation:

Link:

Question (4)

Which of the following correctly matches the organism with its mode of asexual reproduction?

Explanation:

Link:

Question (5)

An organism divides into two daughter cells, but the division can occur in almost any plane. Which organism is most likely being described?

Explanation:

Link:

Question (6)

A unicellular organism divides to produce many daughter cells simultaneously. Which process is involved?

Explanation:

Link:

Question (7)

A student observes a microorganism having a whip-like structure at one end. Its cell division occurs in a definite orientation related to this structure. Which organism could it be?

Explanation:

Link:

Question (8)

A piece of Spirogyra breaks into four fragments and each fragment develops into a complete organism. Which process is illustrated?

Explanation:

Link:

Question (9)

Why can simple cell-by-cell division not normally produce new individuals in highly organised multicellular organisms?

Explanation:

Link:

Question (10)

A planarian is cut into several pieces, and each piece develops into a complete organism. Which statement is correct?

Explanation:

Link:

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