Embryo Development

Q.

Give two differences between a zygote and a fetus.

Q.

What is the blastula of humans called?

Q.

How many primary oocytes are present when a female infant is born?

Q.

The second maturation division of the mammalian ovum occurs

1. Until after the ovum has been penetrated by a sperm

2. Shortly after ovulation before the ovum makes entry into the Fallopian tube

3. In the Graafian follicle following the first maturation division

4. Until the nucleus of the sperm has fused with that of the ovum

Q.

What happens to the zygote after fertilisation?

1. Turns into single celled zygote

2. Turns into multicelled embryo

3. Turns into multicelled gamete

4. Turns into single celled follicle

Q.

What is neurulation?

Q. The stage of the embryo in which all the body parts can be identified is known as ________.

1. clone
2. test tube baby
3. zygote
4. foetus

Q.

Do oogenesis and spermatogenesis both continue throughout the human lifespan?

Q.

What is the importance of neurulation?

Q.

Name the other name for oviducts.

Q. Development of the embryo takes place outside the female body in animals that undergo external fertilisation.

1. True
2. False

Q. Identify (a) and (b) in the following question:
Sperm + (a) $\to$ Zygote
Zygote $\to$ (b) $\to$ Foetus

1. a-Ovum, b-Embryo
2. a-Ovum, b-Uterus
3. a-Embryo, b- Ovum
4. a-Penis, b-Embryo

Q.

In sexual reproduction, what is the name of the cell that gives rise to the gamete of an organism?

1. Foetus

2. Embryo

3. Zygote

4. Germ cell

Q.

The major advantages of sexual reproduction in higher organisms are:

1. It generates useful variations.
2. It ensure better adaptability.
3. It provides resistance against pathogens.
4. It gives better chances of survival.

Q. difference between zygote and embryo [4 marks]

Q. Identify A, B and C in the following image of male reproductive system.

1. A: Sperm duct
   B: Testis
   C: Penis
2. A: Penis
   B: Testis
   C: Sperm duct
3. A: Sperm duct
   B: Penis
   C: Testis
4. A: Testis
   B: Sperm duct
   C: Penis

Q.

When does extrusion of the second polar body occur?

Q. Identify (a) and (b) in the following question:
Sperm + (a) $\to$ Zygote
Zygote $\to$ (b) $\to$ Foetus

1. a-Embryo, b- Ovum
2. a-Penis, b-Embryo
3. a-Ovum, b-Uterus
4. a-Ovum, b-Embryo

Q.

Differentiate between the following pair on the basis of what is mentioned within bracket:

Sperm duct and fallopian tube (function)

Q. Identify (a) and (b) in the following question:
Sperm + (a) $\to$ Zygote
Zygote $\to$ (b) $\to$ Foetus

1. a-Ovum, b-Embryo
2. a-Ovum, b-Uterus
3. a-Embryo, b- Ovum
4. a-Penis, b-Embryo

Q. When the egg gets fertilized, it gets it's nourishment for the growth via the .

1. oviducts
2. semen
3. placenta
4. ovary

Q. In human female, the blastocyst

1. Gets implanted into uterus 3 days after ovulation
2. Forms placenta even before implantation
3. Gets nutrition from uterine endometrial secretion only after implantation
4. Gets implanted in endometrium by the trophoblast cells

Q.

Differentiate between the following pair on the basis of what is mentioned within the bracket.

Sperm duct and Fallopian tube (Function)

Q.

Define secondary sex organ?