Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What causes the disintegration of the endometrium, leading to menstruation, in the absence of fertilization?
In the absence of fertilisation, the corpus luteum degenerates. This causes disintegration of the endometrium leading to menstruation, marking a new cycle. (Refer to paragraph 1, page 35).
What is the term for the cessation of menstrual cycles around 50 years of age in human females?
In human beings, menstrual cycles cease around 50 years of age; that is termed as menopause. (Refer to paragraph 1, page 35).
During which phase of the menstrual cycle do both LH and FSH attain a peak level?
Both LH and FSH attain a peak level in the middle of cycle (about 14th day). (Refer to paragraph 1, page 35).
Which of the following is essential for the maintenance of the endometrium, particularly for implantation of a fertilized ovum?
The corpus luteum secretes large amounts of progesterone which is essential for maintenance of the endometrium. Such an endometrium is necessary for implantation of the fertilised ovum and other events of pregnancy. (Refer to paragraph 1, page 35).
What is the primary event that defines the ovulatory phase?
The Graafian follicle now ruptures to release the secondary oocyte (ovum) from the ovary by the process called ovulation. (Refer to paragraph 2, page 33).
The reproductive cycle in female primates is known as the:
The reproductive cycle in the female primates (e.g. monkeys, apes and human beings) is called menstrual cycle. (Refer to paragraph 3, page 33).
What is the term for the first menstruation, which begins at puberty?
The first menstruation begins at puberty and is called menarche. (Refer to paragraph 3, page 33).
During which phase of the menstrual cycle do the primary follicles in the ovary grow to become a fully mature Graafian follicle?
The menstrual phase is followed by the follicular phase. During this phase, the primary follicles in the ovary grow to become a fully mature Graafian follicle. (Refer to paragraph 2, page 34).
What is the typical average interval for the repetition of the menstrual cycle in human females?
In human females, menstruation is repeated at an average interval of about 28/29 days. (Refer to paragraph 3, page 33).
Which of the following describes the correct order of layers in the cell envelope of most prokaryotic cells, from outermost to innermost?
The NCERT text states: 'The cell envelope consists of a tightly bound three layered structure i.e., the outermost glycocalyx followed by the cell wall and then the plasma membrane.' Therefore, the correct order is Glycocalyx, Cell wall, Plasma membrane.
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