#biology practice questions

BOTANY

Which type of age pyramid indicates a declining population?

An inverted age pyramid indicates a declining population, with a higher number of post-reproductive individuals and fewer young individuals. 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 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -

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ZOOLOGY

Which heart valve prevents the backflow of blood from the aorta into the left ventricle?

The aortic valve prevents blood from flowing back into the left ventricle from the aorta. 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, physiology, human health and related concepts as per latest syllabus.

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BOTANY

What is the primary genetic cause of hemophilia?

Hemophilia is a sex-linked recessive disorder caused by a mutation in the X chromosome. 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 correctly defines vital capacity?

Vital capacity is the maximum amount of air a person can breathe in after a forced expiration. It includes Tidal Volume (TV), Inspiratory Reserve Volume (IRV), and Expiratory Reserve Volume (ERV).

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

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BOTANY

Which of the following occurs at the end of meiosis?

Meiosis results in the formation of four genetically distinct haploid lls. 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 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -

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BOTANY

Which of the following best describes resource partitioning?

Resource partitioning allows species to coexist by utilizing different parts of a resource, reducing direct competition. 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 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -

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ZOOLOGY

Which type of hypersensitivity reaction is responsible for anaphylaxis?

Type I hypersensitivity reactions, mediated by IgE, lead to anaphylaxis, which is a severe allergic reaction. 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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ZOOLOGY

Which type of hypersensitivity reaction is responsible for allergic asthma?

Type I hypersensitivity reactions, mediated by IgE, cause allergic asthma. 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 of the following statements about sterilization methods is incorrect?

Sterilization is a **permanent** method of contraception, not temporary. 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 type of blood vessel has the thickest walls?

**Arteries** have thick walls to withstand high blood pressure as they carry blood away from the heart. 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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BOTANY

Which of the following statements about the xylem is incorrect?

Xylem vessels are dead at maturity and function in water transport. 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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BOTANY

Which of the following statements about the xylem in vascular plants is incorrect?

Xylem primarily transports water and minerals, while phloem is responsible for transporting organic nutrients like sugars. 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: Biology - Botany portion covering relevant concept.

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