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4

Third phase of embryo development is ...

A. Cleavage

B. Fertilization

C. Gametogenesis

D. Gastrulation

Correct Answer :

D. Gastrulation


Related Questions

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During ovulation, for favourable sperm travel oestrogen causes

A. Cervical mucus to become stretchy and clear

B. Less cervical mucus production

C. Tenderness of cervix

D. Slight vaginal bleeding

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The middle piece of the sperm contains

A. Protein

B. Nucleus

C. Mitochondria

D. Centriole

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Human female reaches menopause at the age of about ...

A. 25 years

B. 35 years

C. 50 years

D. 70 years

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What is Hirsuitism in females? (Usually with Poly cystic ovarian disease)

A. Unusually tall

B. Abnormal growth of facial and body hair

C. Abnormal voice

D. Short stature

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Membrane that gives protection to embryo from external shocks is

A. Amnion

B. Allantois

C. Chorion

D. Placenta

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The surgical method of contraception in males

A. Hysterectomy

B. Vasectomy

C. Castration

D. Circumcision

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Human embryo is referred to as fetus from beginning of

A. 1st month of pregnancy

B. 2nd month of pregnancy

C. 3rd month of pregnancy

D. 4th month of pregnancy

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When there is no fertilization, the corpus luteum ...

A. Stops secreting progesterone

B. Changes to corpus albicans

C. Starts producing progesterone

D. Begins next cycle

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Cri-du-chat syndrome in humans is caused by the

A. Trisomy of 21st chromosome

B. Fertilization of an xx egg by a normal y-bearing sperm

C. Loss of half of the short arm of chromosome 5

D. Loss of half of the long arm of chromosome 5

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4

The rate of active movement of sperm is ...

A. 1.5 -3.0 mm/min

B. 1.5 - 3.0 cm/min

C. 1.5 -3.0 m/min

D. 1.5 -3.0 m/hr

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4

Forensic investigation of rape case focuses on the presence of fructose in female reproductive system, the only part of the human body producing fructose is

A. Cowper's gland

B. Prostate gland

C. Testes

D. Seminal vesicle

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The pre fertilisation process stage of sperm before entry into the ovum is called as

A. Maturation

B. Insemination

C. Capacitation

D. Fertilization

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Most of major organs of human embryo are formed by the

A. 16th week of pregnancy

B. 15th week of pregnancy

C. 14th week of pregnancy

D. 12th week of pregnancy

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Villi of human placenta develop from ..

A. Chorion

B. Allantois

C. Yolk sac

D. Amnion

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The most important region of the decidua for the nourishment of the conceptus is the deciduas

A. Frondosum

B. Capsularis

C. Parietalis

D. Basalis

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Medical termination of pregnancy is safe till how many weeks of pregnancy?

A. 10 weeks

B. 12 weeks

C. 20 weeks

D. 22 weeks

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In which phase of menstrual cycle ovulation occurs in

A. Luteal

B. Menstrual

C. Proliferative

D. Secretory

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The three primary germ layers, ectoderm, endoderm and mesoderm are differentiated during

A. Blastulation

B. Neurulation

C. Gastrulation

D. Organogenesis

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Corona radiata is held by...

A. Mucopolysaccharide

B. Oligosaccharide

C. Lipopolysaccharide

D. Lipoprotein

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Cryptorchidism is ...

A. Nondescent of testes in scrotum

B. Nondevelopment of testes

C. Removal of scrotum

D. Breaking connection of vas deferens

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Temperature in scrotum necessary for sperm formation is usually ...

A. 2°c above body temperature

B. 2° c below body temperature

C. 4°c above body temperature

D. 4° c below body temperature

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The chemical of the ovum that attracts and holds sperm

A. Fertilizin

B. Antifertilizin

C. Agglutin

D. Antiagglutinin

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At the end of meiosis I, the Oocyte yields

A. Secondary Oocyte and first polar body

B. First polar body

C. Secondary Oocyte

D. Second polar body

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Ovulation occurs under the influence of high titre of

A. LH

B. FSH

C. Estrogen

D. Progesterone

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Embryo at 16-celled stage is called ...

A. Morula

B. Blastula

C. Blastomere

D. Gastrula

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Which layer of embryo is formed first

A. ectoderm

B. Mesoderm

C. Endoderm

D. Mesenchyma

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Failure of the brain to grow in the foetus may result in:

A. Plagiocephaly

B. Craniostenosis

C. Anencephaly

D. Microcephaly

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Decreased motility of sperm <40 % is known as

A. Azoospermia

B. Oligospermia

C. Asthenozoospermia

D. Necrozoospermia

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Third phase of embryo development is ...

A. Cleavage

B. Fertilization

C. Gametogenesis

D. Gastrulation

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4

Combined Oral contraceptives prevent pregnancy by

A. Tubal block

B. Preventing spermatogenesis

C. Forming a barrier between the ovum and sperm

D. Suppressing ovulation