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Question (11)

QN0026496

A marine animal has an internal skeleton made of calcium carbonate but lacks a notochord. It is most likely a:

(A) Mollusc
(B) Arthropod
(C) Echinoderm
(D) Annelid

Correct Answer: C

Explanation:

Echinoderms such as starfish possess an internal skeleton made of calcium carbonate.

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Question (12)

QN0026497

Scientists classify organisms based on DNA because DNA similarities indicate:

(A) Similar habitats only
(B) Similar body size
(C) Common ancestry
(D) Similar feeding habits

Correct Answer: C

Explanation:

Similar DNA sequences indicate common ancestry among organisms.

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Question (13)

QN0026498

Two organisms share the same family but belong to different genera. Compared to organisms of the same genus, they will:

(A) Share more characteristics
(B) Share fewer characteristics
(C) Be identical
(D) Belong to different kingdoms

Correct Answer: B

Explanation:

Organisms belonging to different genera share fewer characteristics than those in the same genus.

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Question (14)

QN0026499

A student groups whales and fishes together because both live in water. Why is this classification scientifically weak?

(A) Habitat alone does not reflect evolutionary relationships
(B) Both are unicellular
(C) Both possess exoskeletons
(D) Habitat is never used in classification

Correct Answer: A

Explanation:

Classification based only on habitat does not accurately reflect evolutionary relationships.

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Question (15)

QN0026500

Which adaptation enabled gymnosperms to reproduce successfully without depending on water?

(A) Rhizoids
(B) Spores
(C) Seeds and pollen
(D) Thallus body

Correct Answer: C

Explanation:

Seeds and pollen enable gymnosperms to reproduce without requiring water for fertilisation.

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Question (16)

QN0026501

A newly discovered organism is acellular and reproduces only inside host cells. Why is it excluded from the five-kingdom system?

(A) It lacks locomotion
(B) It lacks tissues
(C) It lacks cellular organisation
(D) It lacks DNA

Correct Answer: C

Explanation:

Acellular organisms such as viruses do not fit into the five-kingdom system.

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Question (17)

QN0026502

An insect and an earthworm both have segmented bodies. Which additional feature confirms that the organism is an insect?

(A) Bilateral symmetry
(B) Presence of jointed appendages
(C) Cylindrical body
(D) Moist skin

Correct Answer: B

Explanation:

Jointed appendages are a distinguishing feature of arthropods, including insects.

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Question (18)

QN0026503

Fossils found in deeper rock layers are generally expected to:

(A) Be more complex than upper-layer fossils
(B) Represent older and simpler life forms
(C) Belong only to plants
(D) Be identical to modern organisms

Correct Answer: B

Explanation:

Deeper rock layers usually contain older and comparatively simpler organisms.

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Question (19)

QN0026504

A plant scientist identifies a flowering plant whose seeds are enclosed within fruits. This feature mainly helps in:

(A) Photosynthesis only
(B) Seed dispersal and protection
(C) Water absorption only
(D) Vegetative reproduction only

Correct Answer: B

Explanation:

Fruits protect seeds and aid in their dispersal to new locations.

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Question (20)

QN0026505

In a forest ecosystem, the disappearance of pollinating insects would most directly affect:

(A) Rock formation
(B) Reproduction in flowering plants
(C) Decomposition of litter
(D) Nitrogen fixation by bacteria

Correct Answer: B

Explanation:

Pollinating insects are essential for reproduction in many flowering plants.

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Question (11)

A marine animal has an internal skeleton made of calcium carbonate but lacks a notochord. It is most likely a:

Explanation:

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Question (12)

Scientists classify organisms based on DNA because DNA similarities indicate:

Explanation:

Link:

Question (13)

Two organisms share the same family but belong to different genera. Compared to organisms of the same genus, they will:

Explanation:

Link:

Question (14)

A student groups whales and fishes together because both live in water. Why is this classification scientifically weak?

Explanation:

Link:

Question (15)

Which adaptation enabled gymnosperms to reproduce successfully without depending on water?

Explanation:

Link:

Question (16)

A newly discovered organism is acellular and reproduces only inside host cells. Why is it excluded from the five-kingdom system?

Explanation:

Link:

Question (17)

An insect and an earthworm both have segmented bodies. Which additional feature confirms that the organism is an insect?

Explanation:

Link:

Question (18)

Fossils found in deeper rock layers are generally expected to:

Explanation:

Link:

Question (19)

A plant scientist identifies a flowering plant whose seeds are enclosed within fruits. This feature mainly helps in:

Explanation:

Link:

Question (20)

In a forest ecosystem, the disappearance of pollinating insects would most directly affect:

Explanation:

Link:

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