NEET BIOLOGY

Detailed explanation-1: -The macronucleus is the centre of all metabolic activities of the organism. The micronucleus is a storage site for the germline genetic material of the organism.

Detailed explanation-2: -Ciliates contain two types of nuclei: a micronucleus and a macronucleus. The micronucleus serves as the germ line nucleus but does not express its genes. The macronucleus provides the nuclear RNA for vegetative growth.

Detailed explanation-3: -Cilia have important functions in the life of Paramecium, such as locomotion through the surrounding water and ingestion of food into the cytostome (see Wichterman, 1985). The cilia responsible for the ingestion of food are mainly localized in the gullet, which is a funnelshaped depression of the cell surface.

Detailed explanation-4: -The haploid nuclei of each conjugant then fuse together to form diploid micronuclei and cross-fertilization takes place. The conjugants separate to form exconjugants. They are identical, but different from the earlier cells. Each exconjugate undergoes further division and forms 4 daughter Paramecia.

Detailed explanation-5: –The micronucleus has the function of preserving genetic stability and ensuring that the desired genes are passed onto the next generation. It is also called the generative nucleus or germline.