Embryo Development

Q.

In which phase do the primary oocytes get arrested during early foetal development?

1. Metaphase of Meiosis II

2. Prophase of Meiosis I

3. Prophase of Meiosis II

4. Metaphase of Meiosis I

Q.

Which of the following is the correct order of stages in human embryonic development?

1. Morula, Foetus, Embryo, Blastocyst

2. Embryo, Blastocyst, Morula, Foetus

3. Morula, Blastocyst, Embryo, Foetus

4. Blastocyst, Foetus, Embryo, Morula

Q.

Gonads develop from embryonic

1. Endoderm

2. Mesoderm

3. Ectoderm

4. Both Mesoderm and Endoderm

Q.

Which one develops from endoderm?

1. Nervous system, urinary bladder and eye

2. Liver, connective tissue and heart

3. Thymus, spinal cord and brain

4. Liver, pancreas and thymus/thyroid

Q.

Organisation of ectoderm, mesoderm and endoderm is known as

1. Implantation

2. Gastrulation

3. Blastulation

4. None of the above

Q.

During gestation, in which stage are all of the major organs and structures within the developing mammal formed?

1. Fetal developmental stage

2. Germinal stage

3. Embryonic stage

4. During parturition

Q. Gonads develop from embryonic

1. Ectoderm
2. Endoderm
3. Mesoderm
4. Both mesoderm and endoderm

Q.

The diagram given below is that of a developing human foetus in the womb. Study the same and answer the questions that follow :

(a) Name the parts '1' to '5' indicated by guidelines.

(b) What term is given to the period of development of the foetus in the womb?

(c) How many days does the foetus take to be fully developed?

(d) Mention two functions of the parts labelled '2' other than its endocrine function.

(e) Name any one hormone produced by the part labelled '2'.

Q. In man, the fetal membrane, which forms the intimate connection with the uterine tissue is

1. Amnion only
2. Chorion only
3. Allantois only
4. Allanto-chorionic structure

Q. What are foetal membranes? Give their names. Mention the function of each membrane.