(a) Explain the different ways apomictic seeds can develop. Give an example of each.
(b) Mention one advantage of apomictic seeds to farmers.
(c ) Draw a labelled mature stage of a dicotyledonous embryo.

(a) Explain one application of each one of the following : (A) Amniocentesis. (B) Lactational amenorrhea. (C) ZIFT. (b) Prepare a poster for the school programme depicting the objectives of : "Reproductive and Child Healthe C are Programme." OR (a) Explain any two ways by which apomictic seed can develop. (b) List one advantage and one disadvantage of a apomictic crop. (c) Why do farmers find production of hybrid seeds costly ?

Why are some seeed refferred to as apomictic seeds ? Mention one adantage and one disadvantage to a farmer who uses them.

Why are some seed referred to as apomictic seeds ? Mention one advantage and one disadvantage to a farmer who uses them.

(a) Give one example of addition homopolymer. (b) Mention one use each of LDP and HDP. (c) What is the monomer unit of natural rubber ?

Explain the process of development which 'B' undergoes in albuminous and exalbuminous seeds. Give one example of each of these seeds.

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : (a) Trace the development of megaspore mother cell upto formation of a mature embryo sac in a flowering plant. (b) Draw a labelled diagram of the structure of mature dicot embryo.

(a) Explain the events taking place at the time of fertilization of an ovum in a human female. (b) Trace the development of the zygote upto the implanation in the uterus. (c) Name and draw a labelled sectional view of the embryonic stage that gets implanted.

(a) What type of linkage is present in proteins ? (b) Give one example each of water soluble and fat soluble vitamins. (c ) Draw pyranose structure of glucose.

(a) What type of linkage is present in proteins ? (b) Give one example each of water soluble and fat soluble vitamins. (c ) Draw pyranose structure of glucose.

(a) How are Parthenocarpic fruits produced by some plants and apomictic seeds by some others ? Explain. (b) When do farmers prefer using apomictic seeds ?