Arrange the following terms in the correct developmental sequences:Pollen grain, sporogenous tissu, microspore tetrad, pollen mother cell. Male gametes.

Arrange the following terms in a correct development sequence: Pollen grain, sporogenous tissue, microscope tetrad, pollen mother cell, male gamete.

Short Answer Questions Three mark Each (a) The diagram given below shows the transverse section of a young anther. Identify the parts a, b, c and d. (b) The developmental stages of male gametes in plants consist of microsporogenesis and male gametophyte. Arrange the following terms in their correct developmental sequence. Pollen grain Sporogenous tissue Anther Microspore tetrad Pollen mother cell Male gamete.

QUESTIONS FROM STATE BOARD EXAMINATIONS: Arrange the following words in correct development sequence : Pollen grain, sporogenous tissue, microspore tetrad, microspore mother cell

With the reference to the following figure of stages of a microspore maturing into a pollen grain, answer the question. What is the ploidy level of vegetative or tube cell and generative cell ?

With the reference to the following figure of stages of a microspore maturing into a pollen grain, answer the question. How many mitotic divison takeplace to form two male gametes ?

With the reference to the following figure of stages of a microspore maturing into a pollen grain, answer the question. How many meiotic divisons occurs in the formation of two male gametes ?

An anther has 1200 pollen grains. How many pollen mother cells must have been there to produce them?

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds. Answer 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?

Given below are events that are observed in an artificial hybridisation programme. Arrange them in correct sequential order in which they are followed in hybridization programme. Re-bagging Selection of parents Bagging Dusting of pollen on stigma Emasculation Collection of pollen from male parent.

Short Answer Questions Three mark Each QUESTION FROM STATE BOARD EXAMINATIONS How does the pollen mother cell develop into mature pollen grain? Illustrate the stages with labelled diagrams.