Fertilization in Humans

Q.

The number of nuclei present in a zygote

1. None

2. One

3. Two

4. Four

Q.

How is polyspermy blocked?

Q.

Can two sperms fertilize the same egg?

Q.

What is the significance of meiosis?

Q.

Meiosis takes place in

1. Megaspore

2. Gemmule

3. Conidia

4. Meiocyte

Q.

What Are the Stages of Follicular Development?

Q.

What is the process of gastrulation?

Q.

Is a 30 mm follicle too big?

Q.

Zygote is______. (diploid/haploid)

Q.

Gametes have haploid number of chromosome. Give reason.

Q. Where does the fertilization occur in human females?

1. Cervix
2. Uterus
3. Vagina
4. Oviduct

Q.

Sets of reproductive terms are given below. Choose the set that has an incorrect combination.

1. sperm, testis, sperm duct, penis

2. menstruation, egg, oviduct, uterus

3. sperm, oviduct, egg, uterus

4. ovulation, egg, oviduct, uterus

Q. Fertilisation is the process of fusion of sperm and ovum.

1. True
2. False

Q.

Explain the process of human reproduction.

Q.

During Oogenesis why does the Oocyte arrest its cell division at various places, why cant it form an ovum straight away?

Q.

Mention the functions of the following:

Graafian follicle

Q. Explain reproduction in human beings ?

Q. State True or False. The testes in humans are present outside the body, in the scrotal sacs because sperm develop at around 35 degree celsius which is slightly less than the normal body temperature.

1. False
2. True

Q.

Fertilization of the human egg normally occurs in the

Q.

Which tissue of animals and plants exhibit meiosis?

Q. What is endometrium and where is it located? [2 MARKS]

Q. The number of nuclei present in a zygote is

1. None
2. Two
3. One
4. Four

Q.

What are LH and FSH?

Q. How does the uterus prepare itself for the implantation of the embryo, & what happens when the implantation doesn't take place?

Q.

Identify the statements as true/false.
Fertilization occurs in cervix.

1. True
2. False

Q.

Regarding the assertion and reason; choose the correct option_____.

Assertion [A]: Prophase I of Meiosis I is the longest phase during the formation of gametes.

Reason [R]: It has five sub stages Leptotene, Zygotene, Pachytene, Diplotene and

Diakinesis; during which the number of chromosomes are doubled.

1. Assertion [A] is True and Reason [R] is False.

2. Reason [R] is True and Assertion [A] is False.

3. Assertion [A] is True and Reason [R] is True but is an incorrect explanation to [A].

4. Assertion [A] is True and Reason [R] is True and is a correct explanation to [A].

Q. (a) What is implantation?
(b) Where does it occur in human beings? [2 MARKS]

Q.

Write a note on human fallopian tubes.

Q.

Which is the specialized tissue present above uterus connected to umbilical cord ?

1. Endometrium

2. Cervical wall

3. Placenta

4. Fallopian tubes

Q. What happens when egg gets fertilized?