#practice question

CHEMISTRY

The ionization enthalpy of elements decreases down a group due to:

Increasing atomic size down a group increases the distance between the nucleus and valence electrons, reducing ionization energy. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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CHEMISTRY

The atomic radius of elements increases down a group due to:

Adding new electron shells down a group increases the distance between the nucleus and valence electrons, increasing radius. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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CHEMISTRY

The electron gain enthalpy of elements becomes less negative down a group due to:

Increasing atomic size down a group moves the added electron farther from the nucleus, reducing attraction. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.

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ZOOLOGY

Which of the following maternal cardiovascular changes is most prominent during pregnancy?

During pregnancy, maternal blood volume and cardiac output increase significantly to meet the heightened metabolic demands. 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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CHEMISTRY

The metallic character of elements in a group:

Down a group, atomic size increases, ionization enthalpy decreases, enhancing metallic character. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.

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BOTANY

Which of the following is incorrect about translation?

Translation does **not** produce **DNA from RNA**; it converts **mRNA into protein**. 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 water cycle is incorrect?

Water is not permanently lost from ecosystems; it continuously cycles through different forms. 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: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.

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ZOOLOGY

What is the main function of the pleural fluid in the lungs?

Pleural fluid reduces friction between the lung surface and the thoracic cavity during breathing. 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

What is the function of lenticels in woody stems?

Lenticels are small openings in the bark of woody stems that facilitate gaseous exchange. 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 a function of the lymphatic system?

The lymphatic system removes interstitial fluid, transports lymphocytes, and helps in immune defense. 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: Human Health and Disease, Topic: Immunity, diseases and health maintenance.

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ZOOLOGY

What is the primary function of the pulmonary artery?

The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs for oxygenation. 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 veins is incorrect?

Not all veins carry deoxygenated blood. **Pulmonary veins** carry **oxygenated blood** from the lungs to the heart. 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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