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(a) Draw a diagrammmatic sketch of a tr...

(a) Draw a diagrammmatic sketch of a transverse section of an anther of an angiosperm . Lebel its different walls and the tissue forming microspore mother cells.
(b) Describe the process of microsporogenesis upto the formation of a microsperm.
(c) Write the function of 'germ pore' in a pollen grain of an angiosperm.

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(b) [Only microsporogenesis point is to be written].

(c) Germ pore plays important role in plant fertilization. It helps in the formation of polen tube and release the male gemete during fertilization.
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(a) Draw a diagrammmatic sketch of a transverse section of an anther of an angiosperm .Label its different walls and the tissue forming microspore mother cells. (b) Describe the process of microsporogenesis upto the formation of a microspore. (c) Write the function of 'germ pore' in a pollen grain of an angiosperm.

(a) Describe is sequence the process of microsporogenesis in angiosperms. (b) Draw a labelled diagram of a two celled final structure formed.

Draw a labelled diagram of the sectional view of a mature pollen grain in angiosperms. Explain the functions of its different parts.

If a typical angiospermic anther has 25 microspore mother cells in its each sporangium, calculate the total number of microspore tetrads, pollen grains and male gametes respectively produced by this anther.

A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds. Answser the following questions giving reasons : (a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil ? (b) What would have been the minimum number of ovules present in the ovary ? (c) How many megaspore mother cells were involved ? (d) What is the minimum number of microspore mother cells involved in the above case ? (e) How many male gametes were involved in this case ?

Select the correct statement w.r.t anther. (a) Anther lobes are attached to each other by a band of vasculated sterile tissue. (b) Fibrous bands are present in Hydrocharitaceae. (C) Microsporangia on maturity get filled with pollen grains (d) Homogeneous mass of meristematic cells in microsporangium form microspore mother cells. (e) Cells of middle layers nourishes the developing pollen grains

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