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Embryogenesis and Ovum (AIPVT)

Description: Proteins Embryogenesis
Number of Questions: 15
Created by:
Tags: Proteins Embryogenesis
Attempted 0/15 Correct 0 Score 0

What kind of eggs do human beings have?

  1. Microlecithal

  2. Mesolecithal

  3. Alecithal

  4. Macrolecithal


Correct Option: C
Explanation:

Human beings have alecithal eggs.

In which of the following organisms are centrolecithal eggs found?

  1. Reptiles

  2. Birds

  3. Tunicates

  4. Human beings


Correct Option: B
Explanation:

Birds have both centrolecithal and telolecithal eggs.

What is the process of discharging semen into female vagina called?

  1. Implantation

  2. Insemination

  3. Fertilisation

  4. Copulation


Correct Option: B
Explanation:

The process of discharging semen into female vagina is called insemination.

Where does fertilisation take place?

  1. Ovary

  2. Cervix

  3. Uterus

  4. Fallopian tube


Correct Option: D
Explanation:

Fertilisation takes place in the second portion of the fallopian tube.

The genetic material in ovum is stored in

  1. germinal spot

  2. ooplasm

  3. germinal vesicle

  4. vitelline membrane


Correct Option: C
Explanation:

Germinal vesicle is the nucleus of the ovum and genetic material is present here.

Antifertilisin is secreted by the

  1. ovary

  2. ovum

  3. sperm

  4. vaginal wall


Correct Option: C
Explanation:

Antifertilisin is secreted by a sperm.

The first holoblastic cleavage in zygote leads to the formation of

  1. blastula

  2. blastomeres

  3. morula

  4. blastocoel


Correct Option: B
Explanation:

The first holoblastic cleavage in zygote leads to the formation of 2 blastomeres.

The outer membrane of ovum is known as

  1. plasma membrane

  2. zona pellucida

  3. corona radiata

  4. vitelline membrane


Correct Option: C
Explanation:

Corona radiata is the outer membrane of the ovum.

The first cleavage of zygote in embryonic development is called

  1. equatorial cleavage

  2. holoblastic vertical cleavage

  3. holoblastic horizontal cleavage

  4. radial cleavage


Correct Option: B
Explanation:

The first cleavage in zygote is called holoblastic vertical cleavage.

At which of the following stages does the embryo get implanted in the uterus?

  1. Blastula stage

  2. Zygote stage

  3. Morula stage

  4. Just after first cleavage


Correct Option: C
Explanation:

The embryo gets implanted in the uterus at 12-16 celled morula stage.

How is blastula different from morula?

  1. Presence of more cells

  2. Presence of more yolk

  3. Presence of cavity

  4. Absence of cavity


Correct Option: C
Explanation:

Blastula differs from morula in presence of cavity.

What is trophoblast?

  1. Cells forming embryo properly

  2. Flattened blastomeres at the surface of embryo

  3. Central cavity inside the morula

  4. Division products of zygote


Correct Option: B
Explanation:

Flattened blastomeres at the surface of embryo are called trophoblats.

The process of destabilisation of the acrosomal sperm head membrane allowing greater binding between sperm and oocyte is called

  1. fertilisation

  2. capacitation

  3. gastrulation

  4. copulation


Correct Option: B
Explanation:

Capacitation involves the destabilidation of the acrosomal sperm head membrane.

Which of the following organs is/are ectodermic in origin?

  1. Spleen

  2. Kidneys

  3. Cornea of lens and eye

  4. Stomach


Correct Option: C
Explanation:

Cornea of lens and eye is derived from ectoderm.

Which of the following statements is correct?

  1. Internal ear is derived from endoderm.

  2. Anterior lobe of pituitary is derived from ectoderm.

  3. Blood vascular system is derived from mesoderm.

  4. Tongue is derived from mesoderm.


Correct Option: C
Explanation:

Blood vascular system is derived from mesoderm.

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