WebIntine of pollen grain composed of cellulose and pectin. Explanation: The pollen grain is the male gametophyte of the flowering plants. It consists of two layers, the outer layer called exine and the inner layer called intine. The intine is the innermost layer of the pollen grain, which surrounds the cytoplasm and the male gametes. WebThere are prominent apertures on the exine. These apertures are called germ pores. Sporopollenin is absent at germ pores. Because of the presence of sporopollenin, pollen grains are well preserved as fossils. Intine: The inner wall of the pollen grain is called intine. This layer is thin and continuous layer. It is made up of cellulose and pectin.
Describe the structure of pollen grain. - Biology Shaalaa.com
WebWhat is intine made up of? The intine, or inner layer, consists primarily of cellulose and pectins. The exine, or outer layer, is composed of a highly decay-resistant chemical called sporopollenin. ... while intine is the inner layer of a pollen … WebEach pollen grain is a minute body with varying shape and structure which are formed in the anthers of angiosperms. It consists of two layers:-. 1) Intine or inside layer is a thin … dr nathan carpenter
Pollen grain represents the male gametohhytes. pollen grain are made …
WebIntine is made up of cellulose and pectin. 3%. Solution: In 60% of flowering plants, the pollen grains are shed at two-celled stage (tube cell + generative cell). Further, development of male gametophyte (pollen grain) occurs on stigma. Pollen grain gives rise to pollen tube which absorbs nourishment from the cells of style for its growth. Web16. Assertion : Pollen wall is made up of two walls the intine and the exine. Reason : Both the walls have depositions of sporopollenin. 17. Assertion : Pollen grains of many insect pollinated species are sticky. Reason : In the anemophilous flower, the pollen grains are powdery and non-sticky. 18. Assertion : Nucellus functions as a nutritive ... WebOct 24, 2024 · Name the organic materials the exine and intine of an angiosperm pollen grains are made up of. Explain the role of exine. asked Aug 17, 2024 in Biology by Devakumari ( 52.3k points) dr nathan carnell frederick