ZOOLOGY

ZOOLOGY

Which of the following is primarily responsible for secreting progesterone during the luteal phase of the menstrual cycl

The corpus luteum forms after ovulation and secretes progesterone, which prepares the endometrium for implantation. 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 Reproduction and Reproductive Health, Topic: Gametogenesis, menstrual cycle and reproductive strategies.

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ZOOLOGY

Which of the following statements about hormonal contraceptive pills is incorrect?

Hormonal contraceptive pills do not permanently stop menstruation; their effects are reversible. 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 Reproduction and Reproductive Health, Topic: Gametogenesis, menstrual cycle and reproductive strategies.

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ZOOLOGY

Which endocrine gland is responsible for the secretion of insulin and glucagon?

The pancreas contains the Islets of Langerhans, which secrete insulin and glucagon to regulate blood glucose levels. 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 among the following is the most abundant protein in the biosphere?

Ribulose bisphosphate carboxylase-oxygenase (RuBisCO) is the most abundant protein in the biosphere. 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 frog locomotion is incorrect?

The hind limbs in frogs are longer and more muscular than the forelimbs to aid in jumping. 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 animals belongs to the phylum Arthropoda?

Limulus (King crab) belongs to phylum Arthropoda and is considered a living fossil. 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

During which process do frogs burrow in the summer to avoid extreme heat?

Frogs undergo aestivation, also known as summer sleep, to escape extreme heat. 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 bones is a part of the pelvic girdle?

The ilium is a part of the pelvic girdle, while the humerus, scapula, and clavicle are part of the appendicular 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: Structural Organisation in Animals and Frog, Topic: Tissues, skeletal and organ systems.

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ZOOLOGY

Which of the following is incorrect?

Hardy-Weinberg equilibrium is disrupted by mutations, gene flow, genetic drift, and natural selection. 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 term is used to describe the autonomous replication of a plasmid inside a bacterial ll?

Autonomous replication allows plasmids to multiply independently of the bacterial chromosome. 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 hybrid plant is formed by the fusion of protoplasts of tomato and potato?

Pomato is formed by the fusion of protoplasts from tomato and potato plants through somatic hybridization. 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 gene cloning is incorrect?

Gene cloning has numerous applications in medical research, including gene therapy and pharmaceutical production. 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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