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SubjectsBiology
पुष्प की संरचना एवं विकास
In Class 12 Biology, this topic from Chapter 1, “Sexual Reproduction in Flowering Plants,” explains how a flower is organized and how it develops as the reproductive structure of an angiosperm. Students study the calyx, corolla, androecium, and gynoecium, along with the roles of anther, pollen grain, stigma, style, and ovary. They also connect flower development with microsporogenesis, megasporogenesis, formation of male and female gametophytes, pollination, and the conditions that lead to fertilization and seed formation.
TOPIC PRACTICE
Up to 2 questions from this page. Select your focus, then start.
The governing concept is the structural organisation of a pollen grain. Its outer wall is called the exine, so option B is correct. Exine contains sporopollenin, an exceptionally resistant material that protects pollen from drying, physical injury, and chemical or biological attack. Intine is the inner wall. Nucellus is tissue inside an ovule, and tapetum is a nutritive layer in the anther.
The governing concept is the two-layered wall of a pollen grain. Intine is the inner wall, making option B correct. It is generally thinner than the exine and is mainly composed of cellulose and pectic substances. During germination, the pollen tube emerges through the intine and grows toward the ovule. Exine is the resistant outer layer, while style and micropyle are parts of other reproductive structures.
QUIZ COMPLETE
