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ZOOLOGY

Zoology looks at animal life: structure, function, classification, behaviour and how animals interact with their surroundings. The questions in this category help you revise these topics, recall key terms and diagrams, and see how well the concepts have stuck.

45 questions

ZOOLOGY

Which hormone secreted by the adrenal cortex regulates glucose metabolism?

Cortisol is a glucocorticoid that regulates glucose metabolism by stimulating gluconeogenesis. 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 Physiology - Digestion, Respiration, Circulation, Neural Control and Chemical Coordination, Topic: Organ system functions and hormonal regulation.

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ZOOLOGY

Which hormone deficiency leads to excessive urination and dehydration?

A deficiency of vasopressin (ADH) leads to diabetes insipidus, causing excessive urination and dehydration. 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 Physiology - Digestion, Respiration, Circulation, Neural Control and Chemical Coordination, Topic: Organ system functions and hormonal regulation.

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ZOOLOGY

Which of the following is the causative agent of filariasis?

Filariasis is caused by the filarial worm Wuchereria bancrofti, which affects the lymphatic system. 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 class of vertebrates is exclusively viviparous?

Mammals are distinguished by their viviparous nature, meaning they give birth to live young. 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

Where does the exchange of gases primarily occur in a frog when it is submerged in water?

When submerged in water, frogs rely on cutaneous respiration, where gas exchange occurs through their moist skin. 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: Structural Organisation in Animals and Frog, Topic: Tissues, skeletal and organ systems.

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ZOOLOGY

Which of the following elements is a major component of nucleic acids but is not found in carbohydrates?

Nitrogen is a key component of nucleic acids (DNA & RNA) but is absent in carbohydrates. 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: Principles of Inheritance, Molecular Basis of Inheritance and Biotechnology, Topic: Genetics, DNA techniques and applications.

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ZOOLOGY

What is the primary function of rebrospinal fluid (CSF)?

Cerebrospinal fluid (CSF) cushions the brain and spinal cord while also removing metabolic waste. 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 Physiology - Digestion, Respiration, Circulation, Neural Control and Chemical Coordination, Topic: Organ system functions and hormonal regulation.

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ZOOLOGY

Which hormone from the anterior pituitary is essential for stimulating testosterone production in males?

Luteinizing hormone (LH) stimulates Leydig lls in the testes to produce testosterone. 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 Physiology - Digestion, Respiration, Circulation, Neural Control and Chemical Coordination, Topic: Organ system functions and hormonal regulation.

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ZOOLOGY

Which of the followings is incorrect?

Hardy-Weinberg equilibrium describes the stability of allele frequencies in the absence of evolutionary forces. 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: Evolution, Topic: Theories, Hardy-Weinberg principle and evidences.

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ZOOLOGY

Which of the following statements is correct?

Homo erectus is known as the first hominid to use fire, marking an important stage in human evolution. 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: Evolution, Topic: Theories, Hardy-Weinberg principle and evidences.

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