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#marine biology

43 public questions tagged with this topic.

ZOOLOGY

Why do echinoderms exhibit bilateral symmetry in their larval stage but radial symmetry as adults?

Larval Stage: Bilateral symmetry enables free-swimming larvae to balance and move efficiently in open water. Adult Stage: Adult echinoderms live on the seafloor (benthic zone). Pentaradial symmetry allows them to feed and detect surroundings equally from all directions.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, ph

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BOTANY

Which pigment gives brown algae their characteristic color?

Fucoxanthin, a xanthophyll pigment, gives brown algae (Phaeophyceae) their characteristic color. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.

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ZOOLOGY

Which of the following is an example of a cartilaginous fish?

Pristis (Sawfish) belongs to class Chondrichthyes and has a cartilaginous skeleton. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.

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ZOOLOGY

Which feature is unique to phylum Hemichordata?

Hemichordates have a body divided into three parts: proboscis, collar, and trunk. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Animal Kingdom, Topic: Basis of classification and salient features of phyla.

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ZOOLOGY

Which characteristic allows cartilaginous fishes to remain buoyant in water?

Cartilaginous fishes (e.g., sharks) lack an air bladder, but their cartilaginous skeleton reduces weight, aiding in buoyancy. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, ph

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BOTANY

Which of the following statements about Rhodophyceae is correct?

Certain red algae (Rhodophyceae) produce hydrocolloids like carrageen, used commercially. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Plant Kingdom, Topic: Classification and salient features of plant groups.

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ZOOLOGY

Which of the following features is incorrect regarding echinoderms?

Echinoderms do not have a closed circulatory system; they rely on their water vascular system for circulation. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.

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