Pollen grains have spiny exine to aid in

Pollenn grains have spiny exine to aid in

The hard outer layer of pollen grains called exine is made up of:

Assertion (A): Germ pores are the regions where intine comes out to form a pollen tube after pollination. Reason (B): Germ pores are prominent apertures of pollen grains where exine is thin or absent.

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

Consider the following statements with respect to pollen grains (a) Exine is thin, continuous layer made up of cellulose and pectin (b) Hard outer layer called exine is made of sporopollenin (c) Sporopollenin is present in germ pores (d) Exine exhibits a fascinating array of patterns and designs. Of the above statements

Consider the following statements with respect to pollen grains (a) Exine is thin, continuous layer made up of cellulose and pectin (b) Hard outer layer called exine is made of sporopollenin (c) Sporopollenin is present in germ pores (d) Exine exhibits a fascinating array of patterns and designs. Of the above statements

Name the plant in which the pollen grains are not covered by exine.

Assertion Pollen grains are well preserved during fossilisation. Reason The exine of pollen grain contains sporopollenin.

Pollen grains are able to tolerate extremes of temperature and desiccation because their exine consists of

Pollen grains are able to tolerate extremes of temperature and desiccation because their exine consists of: