A young boy when brought a pet dog home started to complain of watery eyes and running nose.The symptoms disappeared when the boy was kept away from the pet.
1) Name of type of antibody and the chemicals responsible for such a response in the boy.
2) Mention the name of any one drug that could be given to the boy for immediate relief from such a response.
(a) Draw a diagram of the structure of a human ovum surrounded by corona radiata. Label the following parts: (b) (i) Ovum (ii) Plasma Membrane (iii) Zona Pellucida
Describe the asexual and sexual phases of life cycle of Plasmodium that causes malaria in humans. OR (a) What is plant breeding? List the two steps the classical plant breeding involves. (b) How has the mutation breeding helpes in improving crop varieties? Give one example where this technique has helped. (c) How has the breeding programme helped in improving the public nutritional health? State two examples in support of your answer.
(a) Draw a labelled schematic diagram of the transverse section of a mature anther of an angiosperm plant. (b) Describe the characteristic features of an insect pollinated flower. OR (a) Describe the events of spermatogenesis with the help of a schematic representation. (b) Write two differences between spermatogenesis and oogenesis.
