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ZOOLOGY

Zoology questions arranged for revision, taking in animal groups and their characteristics, organ systems, and physiological processes. Working through them helps you connect terminology with function and get comfortable with how animal biology topics are examined.

45 questions

ZOOLOGY

Which condition in females is associated with an absence of menstrual cycles due to lack of ovarian function?

Amenorrhea refers to the absence of menstruation, which can result from ovarian failure or dysfunction. 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 is a correct statement about amniocentesis?

Amniocentesis is a diagnostic technique used to detect genetic disorders in a developing fetus. 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

What is the name of the first rvical vertebra?

The atlas is the first rvical vertebra, supporting the skull. 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 crop is genetically modified for improved vitamin A content?

Golden rice is genetically modified to produce beta-carotene, a precursor of vitamin A, to combat vitamin A deficiency. 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 part of the brain is the largest and is involved in higher-order functions such as thinking and memory?

The rebrum is the largest part of the brain and is responsible for higher cognitive functions like reasoning and memory. 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

What type of circulatory system is found in arthropods?

Arthropods have an open circulatory system, where blood directly bathes tissues and organs. 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 phase of the menstrual cycle is characterized by high progesterone levels and prepares the endometrium for potenti

During the luteal phase, the corpus luteum secretes high levels of progesterone to thicken 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 component of blood is mainly involved in blood clotting?

Platelets (thrombocytes) play a crucial role in blood clotting by forming a platelet plug at the site of injury. 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 receptor mediates the classical genomic actions of estrogen in target tissues?

Estrogen receptor alpha (ERα) is a key mediator of estrogen’s genomic actions in target tissues, influencing gene expression and ll function. 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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