Assertion : Tapetum helps in the libertion of microspores from tetrad
Reason : Tapetum shows callose activity

Assertion: The male of Cycas change in size when the microspores became mature. Reason: The microspores are dispersed by wind.

Read the following text and answer the following questions on the basis of the same: A typical anther is bilobed. It is a tetragonal structure consisting of four microsporangia. These microsporangia form pollen sac which on maturity gets filled with a pollen grains. Pollen grains represent the male gametophytes, their cell wall is very hard. Pollen grains of many species cause severe allergies which cause various diseases in human beings. Assertion (A) : The innermost layer of microsporangium is called tapetum. Reason (R) : Tapetum nourishes the develop into pollen grains.

Assertion : Pollen grains are the immediate product of meiosis of the microspore mother cell. Reason : The pollen grain have diploid number of chromosomes.

Assertion : Reduction division, in Selaginella, occurs during microspore formation only. Reason : It has been proved experimentally by Zacharich in 1963.

Assertion : Reduction division, in Selaginella, occurs during microspore formation only. Reason : It has been proved experimentally by Zacharich in 1963.

Assertion :- Inner most layer of microsporangium or pollen sac, tapetum is of physiological significance. Reason :- All kind of nutrition of developing pollen grains go through tapetum.

Assertion : Each cell of sporgenous tissue is a potential pollen mother cell (PMC) or microspore mother cell. Reason : Each cell of the sporgenous tissue is capable of giving rise to a microspore tetrad

Assertion : In most angiosperms, microspores of a tetrad grow and separate from one another shortly after meiosis. Reason : In the members of families Orchidaceae and Asclepiadaceae, all the pollen grains of a sporangium remain united to form a compact structure called pollinium.