Embryo Development

Q.

Receptors for sperm binding in mammals are present on

1. Zona pellucida

2. Vitelline membrane

3. Perivitelline space

4. Corona radiata

Q. How many of the following are haploid?

Primary oocyte, primary spermatocyte, secondary oocyte, spermatids, ova, secondary spermatocyte.

1. Six
2. Three
3. Four
4. Five

Q.

What is the difference between morula and blastula?

Q.

What type of cell is found in the seminiferous tubules?

Q. Select the correct option of haploid cells from the following groups:

1. Primary oocyte, Secondary oocyte, Spermatid
2. Secondary spermatocyte, First polar body, Ovum
3. Spermatogonia, Primary spermatocyte, Spermatid
4. Primary spermatocyte, Secondary spermatocyte, Second polar body

Q. Sequence of development during the formation of embryo sac is:

1. Megaspore → Megaspore mother cell → Archesporium → Embryo sac.
2. Megasporocyte → Archesporium → Megaspore → Embryo sac.
3. Archesporium → Megaspore mother cell → Megaspore → Embryo sac.
4. Archesporium → Megaspore → Megaspore mother cell → Embryo sac.

Q. Which extrambryonic membrane in humans prevents desiccation of the embryo inside the uterus?

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

Q. Gastrulation is characterised by the formation of:

1. Archenteron
2. Inner cell mass
3. Blastocoel
4. Blastoderm

Q. Arrange the events of embryo formation
sequentially and choose the correct option:
I. Blastocyst II. Mature embryo
III. Morula IV. Zygotic cleavage
V. Blastomeres

1. $V\to II\to I\to III\to IV$
2. $IV\to III\to V\to I\to II$
3. $IV\to V\to III\to I\to II$
4. $IV\to III\to I\to V\to II$

Q. Extra embryonic membranes, chorion and amnion are formed by

1. inner cell mass
   
2. trophoblast
   
3. inner cell mass and trophoblast
4. endometrial tissues

Q.

What are diploblastic organisms

Q. Which of the following cells separate from the egg (female gamete) during maturation?

1. Primary oocyte
2. Secondary oocyte
3. Secondary spermatocyte
4. Polar bodies

Q.

Blastopore is the opening of:

1. Archenteron

2. Blastocoel

3. Gastrocoel

4. Coelenteron

Q.

What is another name for nurse cells?

Q. The process by which the embryoblast cells give rise to an embryonic stage consisting of the germinal layers is called ___________.

1. blastulation
2. gastrulation
3. pregnancy
4. implantation

Q. The correct sequence of stages during embryogeny is
I. Globular stage II. Proembryo III. Embryo IV. Heart shaped stage

1. II, III, IV, I
2. II, I, IV, III
3. II, III, I, IV
4. II, IV, I, III

Q.

What is the function of the Sertoli cells?

Q. Select the option which correctly fills up the blanks in the given two statements.

A. Each seminiferous tubule is lined on its inside by two types of cells called ____(i)____ & ____(ii)_____.
B. The seminiferous tubule opens into the ___(iii)_____ through ____(iv)______.

1. A- (i) spermatogonia (ii) Leydig cells

   B- (iii)Vas deferens (iv) Urethral meatus

   
   

2. A- (i)Spermatogenic cells (ii) Sertoli cells

   B- (iii)Vasa efferentia, (iv) Rete testis.

3. A- (i)Spermatocytes, (ii) Oogonia

   B- (iii) Vas deferens, (iv)Epididymis

4. A-(i) Spermatogonia, (ii) secondary oocytes

   B- (iii)Vas deferens, (iv) Vasa efferentia

Q. Gastrulation is a process

1. Which begins the segregation of germ layers.
2. That occurs just after morulation.
3. That occur just after cleavage.
4. Of rapid growth in blastomeres.

Q. What is gastrulation?

Q. In humans, archenteron is formed during __________.
[1 mark]

1. gastrulation
2. neurulation
3. implantation
4. blastulation

Q.

Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?

1. Chorion

2. Allantois

3. Yolk sac

4. Amnion

Q.

What is formed in gastrulation?

Q.

The signals for parturition originate from

1. Placenta only

2. Oxytocin released from maternal pituitary

3. Placenta as well as fully developed foetus

4. Fully developed foetus only

Q. During pregnancy, the foetus shows its first movement in the ________.

1. second month
2. fifth month
3. sixth month
4. ninth month

Q. Which extraembryonic membrane prevents desiccation of the embryo inside the uterus?

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

Q. The diagram given below is that of a developing human foetus. Study the diagram and then answer the questions that follows.

Mention any two functions of the part labelled B in the diagram.

Q.

What is a 16-celled embryo called?

Q. When the body of ovule, embryo sac, micropyle and funicle, all lie in one vertical plane, the ovule is:

1. Amphitropous
2. Orthotropous
3. Campylotropous
4. Anatropous

Q. Triple fusion or Double fertilization is which type of fertilization ?

1. Vegetative fertilization
2. Asexual fertilization
3. Sexual fertilization
4. none of the above