From Zygote to Blastocyst

Q.

Where is Morula formed?

Q.

What type of cells are in a blastocyst?

Q.

Morula differs from the blastula in the

1. Absence of cavity

2. Presence of cavity

3. Absence of yolk

4. None of these

Q.

State whether true or false:
In non-mammalian species, there is no inner cell mass. Instead, the blastula consists of just one cell layer.

1. True

2. False

Q.

Morula is a developmental stage___________

1. between the zygote and blastocyst

2. after the implantation

3. between the blastocyst and gastrula

4. between implantation and parturition

Q.

At the time of implantation, the human embryo is called:

1. embryo

2. blastocyst

3. zygote

4. foetus

Q. Select the correct explanation for the labels A, B, C and D.

1. A represents the fertilised zygote.
2. B represents the stage of morula formation.
3. C represents the blastocyst.
4. D represents the blastocyst implantation.

Q.

The embryo at the 16-celled stage is known as

1. morula

2. blastula

3. blastomere

4. gastrula

Q.

Cleavage in the fertilised egg of humans

1. Starts in uterus

2. Is meroblastic

3. Is discoidal

4. Starts when egg is in fallopian tube

Q.

A zygote is completely divided into two by a cleavage furrow. This type of cleavage is________

1. equatorial

2. radial

3. meroblastic

4. holoblastic

Q.

The embryonic period finishes at the end of -

1. 8 weeks

2. 4 weeks

3. 2 weeks

4. 12 weeks

Q. Which one of the following statements about morula in humans is correct?

1. It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
2. It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
3. It has far less cytoplasm as well as less DNA than in an uncleaved zygote
4. It has more cytoplasm and more DNA than an uncleaved zygote