Embryo Development

Q.

Define parturition.

Q.

What is a primary oocyte?

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.

What is the mesoderm layer?

Q.

By origin, brain is

1. Ectodermal

2. Mesodermal

3. Endodermal

4. Ecto-mesodermal

Q.

Which germ layer develops into bones?

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.

What is placenta? State its two role during pregnancy.

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.

Umbilical cord in the growing fetus is connected to ………………………..

1. uterus

2. Placenta

3. cervix

4. ovary

Q. The diagram given alongside is that of a developing human foetus in the womb. Study the same and answer the questions that follow: [5 MARKS]
(a) Name the parts '1' to '5'.
(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 labeled '2' other than its endocrine function.
(e) Name the hormone (any one) produced by the part labeled '2'.

Q.

What is gastrulation?

Q.

Organisation of ectoderm, mesoderm and endoderm is known as

1. Implantation

2. Gastrulation

3. Blastulation

4. None of the above

Q.

What is required for the formation of placenta?

Q. Embryogenesis is a post fertilisation event.

1. False
2. True

Q. Placenta is formed in humans by

1. Amnion
2. Allantois
3. Chorion
4. All the above

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.

The embryo gets nutrition from the mothers blood with the help of special tissue called

1. Placenta

2. Zygote

3. Ovum

4. Sperm

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

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. 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.

Gonads develop from embryonic

1. Endoderm

2. Mesoderm

3. Ectoderm

4. Both Mesoderm and Endoderm

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

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

Q. Match the embryonic layers with their respective structures formed during foetal development.

1. Umbilical cord
2. Placenta
3. Amniotic sac

Q. Extra-embryonic membranes of the mammalian embryo are derived from

1. Inner cell mass
2. Trophoblast
3. Formative cells
4. Follicle cells

Q.

Organisation of ectoderm, mesoderm and endoderm is known as

1. Implantation

2. Gastrulation

3. Blastulation

4. None of the above

Q. Gonads develop from embryonic

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

Q. What is the significance of chorion during embryonic development?

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. The extra embryonic membrane that involve in the formation of the placenta in human is

1. Chorion
2. Allantois
3. Yolk sac
4. Amnion