Fetus Development

Q.

What is implantation? Where does it occur in human beings?

Q. At the 32-cell stage of division, the embryo is known as a blastula that contains inner cell mass and outer cell mass. What do the inner and outer cell masses eventually become?

1. Placenta / embryo and foetus
2. Embryo and foetus / large part of placenta
3. Chorionic membrane / only amniotic membrane
4. Allantois / only yolk sac

Q. Egg apparatus of embryo sac has egg cell and synergids. The ploidy level and number of respective cells are

1. Egg Cell		Synergids
   Ploidy	Number	Ploidy	Number
   n	1	n	1

2. Egg Cell		Synergids
   Ploidy	Number	Ploidy	Number
   2n	1	2n	2

3. Egg Cell		Synergids
   Ploidy	Number	Ploidy	Number
   n	1	n	2

4. Egg Cell		Synergids
   Ploidy	Number	Ploidy	Number
   2n	2	2n	1

Q.

What are the 4 stages of embryonic development?

Q. Which of the following cannot be detected in developing foetus by amniocentesis techniques?

1. Klinefelter syndrome
2. Jaundice
3. Sex of the foetus
4. Down Syndrome

Q.

Sir actually it is from human reproduction.

The blood flowing through the umbellical cord of mammalian embryo is

a) 100%foetal.

b) 100%maternal.

c) 50% foetal and 50% maternal.

d) none of these.

Q. Given below are two statements regarding embryonic cleavage in humans
Statement 1: With more and more cleavage divisions, the resultant blastomeres become smaller and smaller in embryos.
Statement 2: The consequence of rapid cell division is that the ratio of nuclear volume to cytoplasmic volume decreases.

Choose the correct option

1. Both the statements are true
2. Statement 1 is true but statement 2 is false
3. Statement 1 is false and statement 2 is true
   
4. Both the statements are false

Q.

What is a cleavage furrow?

Q.

What is the ball of cells formed after fertilisation called?

Q. The diagram shows germ layers. The animals having structures shown in the figures (A) and (B) are respectively called:

1. Diploblastic, Triploblastic
2. Triploblastic, Diploblastic
3. Diploblastic, Diploblastic
4. Triploblastic, Triploblastic

Q.

The umbilical artery carries blood from the fetus to the placenta and the umbilical vein carries blood from the placenta to the fetus. Which is the correct statement regarding
differences in blood composition between the umbilical artery and vein?
(A) Blood in the umbilical artery contains less glucose than blood in the umbilical
vein.
(B) Blood in the umbilical artery contains less carbon dioxide than blood in the
umbilical vein.
(C) Blood in the umbilical artery contains more deoxygenated blood in the
umbilical vein.
(D) Blood in the umbilical artery contains less urea than blood in the umbilical
vein.

Q. The transformation of the blastula into the gastrula is characterised by the formation of three germ layers. Which of the following is responsible for the formation of these germ layers?

1. Corona radiata of the zygote
2. Zona pellucida of the blastocyst
3. Trophoblast of the blastocyst
4. Inner cell mass of the blastocyst

Q.

Nematoblasts are found in

1. mesoderm

2. periderm

3. endoderm

4. ectoderm

Q. Human egg is Microlecithal or Alecithal or both?

Q.

Nucellar embryo is

Amphimictic haploid

Amphimictic diploid

Apomictic haploid

Apomictic diploid

Explain.....

Q. Cleavage are repeated mitotic division which start in zygote at:

1. Uterus
2. Fimbria
3. Infundibulum
4. Isthmus

Q.

During cleavage, nucleocytoplasmic ratio is a) maintained b)decreased c)increased d)variable

Q.

What happens if the cytoskeleton is damaged?

Q.

What happens during cleavage?

Q.

What is the difference between blastocyst and blastula?

Q.

Name the layers of the artery whose components are labeled as 1, 2 and 3 below

1. 1.Tunica intima; 2. Tunica media; 3.Tunica adventitia

2. 1. Tunica adventitia; 2.Tunica intima; 3.Tunica media

3. 1.Tunica media: 2. Tunica adventitia: 3.Tunica intima

4. 1.Tunica adventitia: 2. Tunica media: 3. Tunica intima

Q.

Ovum is fertilized in

1. Vagina

2. Uterus

3. Fallopian tube

4. Ovary

Q. .Choose the correct underlying process of the following
Zygote_____(i)______ Morula ______(ii)______Blastula ______(iii)________ Gastrula.

1. (i) Cleavage (ii) Blastulation (iii) Gastrulation
   
2. (i) Blastulation (ii) Cleavage (iii) Gastrulation
3. (i) Cleavage (ii) Gastrula (iii) Blastula
   
4. (i) Blastulation (ii) Cleavage (iii) Gastrulation
   

Q.

Grey crescent develops in.

1. Eye of frog

2. Fertilized egg of frog

3. Brain of rabbit

4. Eye of cockroach

Q. Morula is a developmental stage

1. between the zygote and blastocyst
   
2. between the blastocyst and gastrula
3. after the implantation
4. between implantation and parturition

Q. The embryo sac has ___ egg cell, ___ synergids, ___ antipodal cells and ___ polar cells.

1. 1, 3, 2, 2
2. 2, 1, 3, 2
3. 1, 2, 3, 2
4. 1, 3, 2, 1

Q.

Attachment of developing embryo with the uterus is called _________.

Q.

After ovulation, in a female mammal, the structure which is formed by the ruptured follicle after ovulation is

1. Corpus luteum

2. Graafian follicle

3. Placenta

4. Epididymis

Q.

A newborn baby and hibernating mammal has the cold resisting device due to:-

1. White fat

2. Fat rich in reticular tissue

3. Synapse

4. Brown fat

Q.

Human embryo is protected by________

1. allontois

2. amniotic cavity

3. pleural cavity

4. peritoneal cavity