Out of these three persons, who is affected with communicable disease? In what way the disease spread?

Vidya got a plant which was affected with a viral disease. Her objective is to raise a disease free plant from this infected plant through tissue culture. Which part of the plant should be selected as the explant?

After diagnosing the blood of a foetus, a doctor comments that the foetus has some immunological diseases and it may be due to the malfunctioning of an endocrine gland. a) Name the gland. b) Which are the hormones produced by this grand ? c) What are the main functions ofthese hormones ?