Pollen Germination & Tube Formation — NEET Biology
📚 Practice ConceptAs mentioned earlier, following compatible pollination, the pollen grain germinates on the stigma to produce a pollen tube through one of the germ pores. The contents of the pollen grain move into the
Which of the following statements are NOT correct? S1: The vegetative cell in a mature pollen grain is smaller than the generative cell and contains a large, irregularly shaped nucleus. S2: In over 60% of angiosperms, pollen grains are shed at a 2-celled stage, where the generative cell divides to form two male gametes during the growth of pollen tube in the stigma. S3: The generative cell possesses abundant food reserves and is primarily responsible for forming the pollen tube upon germination. S4: The inner wall of the pollen grain, called the intine, is made of sporopollenin and extends through the germ pores to form the pollen tube. S5: In plants which shed pollen in the 3-celled condition, the pollen tubes carry the two male gametes from the beginning. S6: The primary function of the vegetative cell is to provide nourishment to the generative cell and support the growth of the pollen tube.
View solution & NCERT explanation
Correct answer: A — S1, S3 and S4
Let's evaluate each statement: S1: The vegetative cell is bigger, has abundant food reserve, and a large irregularly shaped nucleus, while the generative cell is small. This statement incorrectly states that the vegetative cell is smaller. This statement is incorrect. S2: In over 60% of angiosperms, pollen grains are shed at the 2-celled stage. In such plants, the generative cell divides to form the two male gametes during the growth of the pollen tube in the stigma. This statement is correct. S3: The vegetative cell, not the generative cell, has abundant food reserves and is responsible for forming the pollen tube. The generative cell is small, spindle-shaped, and produces male gametes. This statement is incorrect. S4: The inner wall of the pollen grain, the intine, is made up of cellulose and pectin. The outer layer, the exine, is made up of sporopollenin. The pollen tube emerges from the germ pore, formed by the intine. This statement incorrectly attributes sporopollenin to the intine. This statement is incorrect. S5: In plants which shed pollen in the three-celled condition, pollen tubes carry the two male gametes from the beginning, as the generative cell has already divided. This statement is correct. S6: The vegetative cell is bigger and has abundant food reserve, indicating its role in providing nutrition for the generative cell and the growing pollen tube. This statement is correct. Therefore, statements S1, S3, and S4 are NOT correct. This question assesses the understanding of the distinct characteristics and functional roles of the vegetative and generative cells within a pollen grain and details of pollen wall composition and pollen tube formation.
What does NCERT say about As mentioned earlier following?
Has this concept appeared in NEET?
Which chapter is this from?
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