In frog chromosome number is reduced to half

• when 2nd polar body is separated

• when 2nd polar body is divided

• when 3rd polar body is separated

• when 1st polar body is separated

The figure shows different human tissues labelled as A to D. Which option gives the correct identification of the label, its location and one feature.

• D-Unicellular glandular epithelium, goblet cells, secrete saliva

• B-Squamous epithelium, walls of blood vessels, form a diffusion boundary

• A-Cuboidal epithelium, ducts of glands, secretion and absorption

• C-Columnar epithelium, lining of stomach, secretion and absorption

123.

Pacinian corpuscles occur in the skin of certain parts of body in mammals. These are

• type of glands

• pain receptors

• naked tactile receptors

• encapsulated pressure receptors.

Pseudostratified epithelium is found in

• seminiferous tubule

• Fallopian tube

• trachea

• kidney tubules

Assertion : Gap junctions perform cementing function to keep the neighbouring cells together.

Reason : Tight junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small and big molecules, etc.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false

Assertion : A mutual exchange of sperms occurs between two earthworms during mating.

Reason : Mature sperms and egg cells and nutritive fluid are deposited in cocoons produced by gland cells of clitellum.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Microvilli of intestinal epithelium are similar in function with 

• typhlosole in earthworm

• hepatic caecae in cockroach

• intestinal caecum in earthworm

• Malpighian tubules in coackroach

The type of epithelial cells which line the inner surface of Fallopian tubes, bronchioles and bronchi are known as

• squamous epithelium

• ciliated epithelium

• columnar epithelium

• cubical epithelium

Assertion : In cockroach respiratory gases directly comes in contact with the various organs of the body. 

Reason : Cockroaches do not have respiratory pigment.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

Assertion : Pharyngeal nephridia play a role in the conservation of water in the earthworm.

Reason : They help the earthworm in keeping the skin moist for cutaneous respiration.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.