Practice free Human Reproduction (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The inner cell mass of the blastocyst contains stem cells. What is the significance of these stem cells?
The NCERT states, 'It needs to be mentioned here that the inner cell mass contains certain cells called stem cells which have the potency to give rise to all the tissues and organs.'
Which of the following pairs of hormones are secreted by the placenta as an endocrine tissue?
The NCERT mentions, 'Placenta also acts as an endocrine tissue and produces several hormones like human chorionic gonadotropin (hCG), human placental lactogen (hPL), estrogens, progestogens, etc.'
What significant developmental event occurs by the end of 12 weeks (first trimester) of human pregnancy?
The NCERT states, 'By the end of 12 weeks (first trimester), most of the major organ systems are formed, for example, the limbs and external genital organs are well-developed.'
Increased levels of hormones like estrogens, progestogens, cortisol, prolactin, and thyroxine in maternal blood during pregnancy are essential for:
The NCERT text explains, 'Increased production of these hormones is essential for supporting the fetal growth, metabolic changes in the mother and maintenance of pregnancy.'
Immediately after implantation, the inner cell mass differentiates into three germ layers: ectoderm, endoderm, and soon after, mesoderm. These three germ layers give rise to:
The NCERT states, 'Immediately after implantation, the inner cell mass (embryo) differentiates into an outer layer called ectoderm and an inner layer called endoderm. A mesoderm soon appears between the ectoderm and the endoderm. These three layers give rise to all tissues (organs) in adults.'
Which of the following hormones is NOT directly involved in the neuroendocrine mechanism of parturition?
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.
The initial production of milk towards the end of pregnancy is termed:
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.
Colostrum, secreted during the initial days of lactation, is crucial for the newborn due to its high content of:
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.'
The 'foetal ejection reflex' originates from:
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.'
In the mammary gland, milk is secreted by the cells of:
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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