Question

Read the following statements and select the right option :
I. The spleen is a large bean-shaped organ, which mainly contains lymphocytes and phagocytic cells.
II. The principal of vaccination is based on the property of memory of the immune system.
III. The graft rejected or failure of organ transplantation is due to cell-mediated immunity .
IV. The yellowish fluid colostrum has an abundant amount of lgA antibodies which provide active immunity to newborn babies.

Answer 1

Explanation:

Select the option with a correct representation of phylum of animal to the below - mentioned features :

I. The body is supported by a skeleton made up of spicules or spongin fibers with choanocytes line the spongocoel.

II. Specialized cells called flame cells help in osmoregulation and excretion.

III. The body bears eight rows of ciliated comb plates which helps in locomotion.

IV. The alimentary canal is complete with the well developed muscular pharynx.