03-12-2012, 12:30 PM
BIOLOGY ASSIGNMENT
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1. What i s the function of following:
a] tassels of corncob.
b]tapetum in the microsporangium.
2.What are the characters of wind pollinated flowers?
3.Name the product of fertilisation that forms the kernel of coconut.How does the kernel differ from coconut water?
4.Why is the process of fertilisation in a flowering plant called as double fertilisation?Explain.
5.Describe the structure of a mature pollen grain and draw a labelled diagram of its two-celled stage.
6.Draw a labelled diagram of anatropous ovule.
7.Trace the development of-
a]a mature ovule from a megaspore mother cell.
b]a microsporophyte cell in an anther to a mature pollen grain.
8.What are chasmogamous flowers?Can cross-pollination occur in cleistogamous flowers?
9.What is meant by emasculation?When and why does a plant breeder employ this technique?
10.What is bagging technique?How is it useful in plant breeding program?
11.Explain the varoius stages in the development of embryo sac from megaspore mother cell in a flowering plant.Draw the L.S.of an ovule showing mature female gametophyte and label its parts.