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Zoology MCQs for NEET — Practice Questions with Answers

Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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What is one of the ways transgenic animals are specifically designed to aid in the study of normal physiology and development?

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Explanation

The NCERT text says, 'Transgenic animals can be specifically designed to allow the study of how genes are regulated, and how they affect the normal functions of the body and its development, e.g., study of complex factors involved in growth such as insulin-like growth factor.'

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Which of the following represents a principle of gene therapy as described in the provided text?

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Explanation

The text states, 'It does so by replacing a defective mutant allele with a functional one or gene targeting which involves gene amplification.' Option o2 directly reflects this principle.

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The use of viruses as vectors in gene therapy leverages their natural ability to:

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Explanation

The text specifies, 'Viruses that attack their hosts and introduce their genetic material into the host cell as part of their replication cycle are used as vectors to transfer healthy genes or more recently portions of genes.' This highlights their natural gene delivery mechanism.

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Which of the following hormones is NOT directly involved in the neuroendocrine mechanism of parturition?

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Explanation

The context states: 'The process of childbirth is called parturition which is induced by a complex neuroendocrine mechanism involving cortisol, estrogens and oxytocin.' Progesterone levels typically drop before parturition, but it's not listed as directly inducing the process in this neuroendocrine mechanism.

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The initial production of milk towards the end of pregnancy is termed:

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Explanation

The context states: 'The mammary glands of the female undergo differentiation during pregnancy and starts producing milk towards the end of pregnancy by the process called lactation.' Lactogenesis refers to the initiation of milk production.

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Colostrum, secreted during the initial days of lactation, is crucial for the newborn due to its high content of:

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Explanation

The context mentions: 'The milk produced during the initial few days of lactation is called colostrum which contains several antibodies absolutely essential to develop resistance for the new-born babies.'

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The 'foetal ejection reflex' originates from:

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Explanation

The text states: 'The signals for parturition originate from the fully developed foetus and the placenta which induce mild uterine contractions called foetal ejection reflex.'

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In the mammary gland, milk is secreted by the cells of:

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Explanation

The context describes: 'The glandular tissue of each breast is divided into 15-20 mammary lobes containing clusters of cells called alveoli... The cells of alveoli secrete milk.'

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Where is the milk secreted by alveolar cells stored before being expressed?

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Explanation

The text states: 'The cells of alveoli secrete milk, which is stored in the cavities (lumens) of alveoli.'

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Which of the following accurately describes the pathway of milk from its production site to the nipple?

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Explanation

Based on the description: 'The alveoli open into mammary tubules. The tubules of each lobe join to form a mammary duct. Several mammary ducts join to form a wider mammary ampulla which is connected to lactiferous duct and opens at the nipple.'

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