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Question (11)

QN008359

Why are sponges considered one of the simplest animals?

(A) They possess organs
(B) They lack tissues and organs
(C) They have jointed appendages
(D) They possess a backbone

Correct Answer: B

Explanation:

Sponges show multicellularity without true tissues.

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Question (12)

QN008360

Which major evolutionary advancement is seen in cnidarians compared to poriferans?

(A) Presence of tissues
(B) Development of seeds
(C) Presence of feathers
(D) Formation of fruits

Correct Answer: A

Explanation:

Cnidarians possess tissue-level organisation.

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Question (13)

QN008361

Why do flatworms show better directional movement than cnidarians?

(A) Presence of exoskeleton
(B) Bilateral symmetry
(C) Presence of flowers
(D) Segmented body

Correct Answer: B

Explanation:

Bilateral symmetry allows better coordination and movement.

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Question (14)

QN008362

Which feature in roundworms increased efficiency of digestion?

(A) Single opening
(B) Body cavity
(C) Two openings — mouth and anus
(D) Tentacles

Correct Answer: C

Explanation:

Separate mouth and anus improve digestion efficiency.

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Question (15)

QN008363

Which advantage does segmentation provide in annelids?

(A) Prevention of locomotion
(B) Greater flexibility and movement control
(C) Elimination of respiration
(D) Reduction in coordination

Correct Answer: B

Explanation:

Segmentation helps precise and flexible movement.

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Question (16)

QN008364

Arthropods survive successfully in dry environments mainly because of

(A) Soft body covering
(B) External skeleton
(C) Absence of appendages
(D) Lack of muscles

Correct Answer: B

Explanation:

Exoskeleton prevents water loss and provides protection.

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Question (17)

QN008365

Which feature is common to both arthropods and molluscs?

(A) Notochord
(B) Cellular organisation only
(C) Organ system level organisation
(D) Absence of body covering

Correct Answer: C

Explanation:

Both groups show organ system level organisation.

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Question (18)

QN008366

Which evolutionary trend is observed from porifera to echinodermata?

(A) Decrease in body complexity
(B) Gradual increase in body organisation
(C) Loss of coordination
(D) Elimination of movement

Correct Answer: B

Explanation:

Animal body organisation became more complex over time.

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Question (19)

QN008367

Why are protochordates important in animal evolution?

(A) They possess flowers
(B) They represent transition towards chordates
(C) They lack support structures
(D) They are unicellular

Correct Answer: B

Explanation:

Protochordates possess notochord at some stage of life.

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Question (20)

QN008368

Which structure acts as a precursor to the vertebral column in chordates?

(A) Tentacle
(B) Exoskeleton
(C) Notochord
(D) Rhizoid

Correct Answer: C

Explanation:

Notochord later develops into vertebral column in vertebrates.

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Question (11)

Why are sponges considered one of the simplest animals?

Explanation:

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Question (12)

Which major evolutionary advancement is seen in cnidarians compared to poriferans?

Explanation:

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Question (13)

Why do flatworms show better directional movement than cnidarians?

Explanation:

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Question (14)

Which feature in roundworms increased efficiency of digestion?

Explanation:

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Question (15)

Which advantage does segmentation provide in annelids?

Explanation:

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Question (16)

Arthropods survive successfully in dry environments mainly because of

Explanation:

Link:

Question (17)

Which feature is common to both arthropods and molluscs?

Explanation:

Link:

Question (18)

Which evolutionary trend is observed from porifera to echinodermata?

Explanation:

Link:

Question (19)

Why are protochordates important in animal evolution?

Explanation:

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Question (20)

Which structure acts as a precursor to the vertebral column in chordates?

Explanation:

Link:

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