BIOLOGY 1 Marks Question

Identify True/ False statements. Correct each false statement to make it true.
Spermatozoa get nutrition from Sertoli cells. (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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Male and female gametes are _____________. (diploid/ haploid)

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Humans are _____________. (oviparous, viviparous, ovoviviparous)

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

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

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.
Presence or absence of hymen is not a reliable indicator of virginity or sexual experience. (True/ False)

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

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

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

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The fusion of male and female gametes is called _____________

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Zygote is _____________. (diploid/ haploid)

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Ovulation is induced by a hormone called _____________.

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 do you mean by foetal ejection reflex?

Identify the odd one out in each of the following sets:

1. Rete testis, vas deferens, isthmus, epididymis.
2. Seminal vesicles, ampulla, prostate, bulbourethral glands.

Match Column I with Column II.

S. No.	Column I	S. No.	Column II
A.	Cleavage	1.	Outer layer of the blastocyst that attaches to the endometrium during implantation.
B.	Implantation	2.	Mitotic divisions of the zygote in quick succession.
C.	Inner cell mass	3.	Embedding of the blastocyst in the endometrium of uterus.
D.	Trophoblast	4.	Release of secondary oocyte from the ovary.
E.		5.	Group of cells attached to one end of trophoblast that differentiate into embryo proper.

From which germ layers do the following organs differentiate?

1. Kidney.
2. Urinary bladder.

The diagram shows the female reproductive system. Where do fertilisation and implantation occur?

Where does fertilization take place in human female?

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

What is corona radiata?

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

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?

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

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

What is trophoectoderm?

What is the function of Leydig cells?

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?

How is the first sign of growing foetus noticed?

List the changes that the primary ooctye undergoes in the tertiary follicular stage in the human ovary.

Are there any homologous organs in male and female reproductive system? If yes, give examples.

Name the hormones produced only during pregnancy in a human female. Mention their source organ.

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

Name the cells that nourish the germ cells in the testes. Where are these cells located in the testes?

Sperms have a tail, whereas eggs do not. Why?

Name the hormone that maintains the functions of male accessory ducts and glands.