Biology 1 Marks Question

Identify True/ False statements. Correct each false statement to make it true.
Presence or absence of hymen is not a reliable indicator of virginity or sexual experience. (True/ False)

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Zygote divides to form _____________ which is implanted in uterus.

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The structure which provides vascular connection between fetus and uterus is called _____________.

Fill in the blanks:
Fertilisation takes place in _____________.

Identify True/ False statements. Correct each false statement to make it true.
Leydig cells synthesise androgens. (True/ False)

Fill in the blanks:
Humans reproduce _____________. (asexually/ sexually)

How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?

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Ovulation is induced by a hormone called _____________.

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Male and female gametes are _____________. (diploid/ haploid)

Identify True/ False statements. Correct each false statement to make it true.
Menstrual cycle ceases during pregnancy. (True/ False)

Fill in the blanks:
Fertilisation is _____________ in humans. (external/ internal)

Fill in the blanks:
The fusion of male and female gametes is called _____________

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Humans are _____________. (oviparous, viviparous, ovoviviparous)

Fill in the blanks:
The process of release of ovum from a mature follicle is called _____________.

Identify True/ False statements. Correct each false statement to make it true.
Oogenesis takes place in corpus luteum. (True/ False)

Fill in the blanks:
Zygote is _____________. (diploid/ haploid)

Identify True/ False statements. Correct each false statement to make it true.
Androgens are produced by Sertoli cells. (True/ False)

Identify True/ False statements. Correct each false statement to make it true.
Spermatozoa get nutrition from Sertoli cells. (True/ False)

Identify True/ False statements. Correct each false statement to make it true.
Leydig cells are found in ovary. (True/ False)

Where is acrosome present in humans? Write its function.

Name the embryonic stage that gets implanted in the uterine wall of a human female.

Where does fertilisation normally take place in a human female?

Write the location and function of the Sertoli cells in humans.

Name the type of cell division that takes place in the zygote of an organism exhibiting haplontic life cycle.

How does colostrum provide initial protection against diseases to newborn infants? Give one reason.

What is the role of cervix in the human female reproductive system?

A spermatogonial cell has 30 chromosomes. How many chromosomes will be found in:

1. The primary spermatocyte.
2. The spermatid?

What is acrosome?

Given below are the stages in human reproduction. Write them in correct sequential order.
Insemination, Gametogenesis, Fertilisation, Parturition, Gestation, Implantation

Which type of cell division forms spermatids from the secondary spermatocytes?

When does ovulation occur?

Name the term used for metamorphosis of spermatids?

Given below are the events in human reproduction. Write them in correct sequential order.
Insemination, gametogenesis, fertilisation, parturition, gestation, implantation.

How many primary follicles are left in each ovary at puberty?

What is the fate of trophoblast in mammalian embryo?

During reproduction, the chromosome number (2n) reduces to half (n) in the gametes and again resume the original number (2n) in the offspring, what are the processes through which these events take place?

Name the muscular layer of human uterus.

Female reproductive organs and associated functions are given below in column A and B. Fill in the blank boxes.

Column A	Column B
Ovaries	Ovulation
Oviduct	A
B	Pregnancy
Vagina	Birth

Mention the function of mitochondria in sperm.

Name the part of the genital tract of human female which acts as ‘womb’.

Name the scientific term used for the membrane that surrounds an ovum.

Where does fertilization take place in human female?

Name the stages when oogenesis and spermatogenesis initiate in human female and male, respectively.

What is trophoectoderm?

What is the function of Leydig cells?

Mention the importance of LH surge during menstrual cycle.

What do you call the layer of cells forming the outer wall of the blastocyst?

Spermatids possess haploid chromosome number. Explain.

Explain the function of umbilical cord.

How is the entry of only one sperm and not many ensured into an ovum during fertilisation in humans?