KCET · BIOLOGY · STD 12 - 1. Sexual Reproduction in Flowering Plants
Among the following statements related to pollens, choose the correct one.
Statement I: In 40% of angiosperms pollen grains are shed at 3-celled stage.
Statement II: Intine is made of cellulose and pectin and it is discontinous with germ pores.
- A Both statements I and II are correct.
- B Both statements I and II are incorrect.
- C Statement I is correct and Statements II is incorrect.
- D Statement I is incorrect and Statement II is correct
Answer & Solution
Correct Answer
(C) Statement I is correct and Statements II is incorrect.
Step-by-step Solution
Detailed explanation
(C) Statement I is correct and Statements II is incorrect.,
In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage. In the remaining species, the generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage). The inner wall of the pollen grain is called the intine. It is a thin and continuous layer made up of cellulose and pectin.
In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage. In the remaining species, the generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage). The inner wall of the pollen grain is called the intine. It is a thin and continuous layer made up of cellulose and pectin.
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from BIOLOGY
- Enzyme which is useful to remove the oily stains in laundry.KCET 2022 Medium
- Roquefort cheese' is ripened by using aKCET 2014 Easy
- The genotype of a husband and wife are \(I ^{ A } I ^{ B }\) and \(I ^{ A } I ^{ O }\) Among the blood types of their children, how many different genotypes and phenotypes are possible?KCET 2021 Medium
- Match the entries in Column-I with those of Column-II and choose the correct answer given below.
Column-I Column-II A. FSH (p) Normal growth B. GH (q) Ovulation C. Prolactin (r) Parturition D. Oxytocin (s) Water diuresis (t) Milk secretion KCET 2013 Hard - Function of contractile vacoule in amoeba isKCET 2023 Easy
- Implantation is influenced byKCET 2017 Easy
More PYQs from KCET
- The reserve material in prokaryotic cells are stored in the cytoplasm in the form ofKCET 2025 Medium
- If the value of a third order determinant is \( 16 \), then the value of the determinant formed by
replacing each of its elements by its co factor isKCET 2019 Easy - Phosphorus pentachlorideKCET 2020 Medium
- \( \int \frac{\sin ^{2} x}{1+\cos x} d x \)KCET 2015 Easy
- If \(2^{x}+2^{y}=2^{x+y}\), then \(\frac{d y}{d x}\) isKCET 2020 Hard
- When an electrolyte is dissociated in solution, the van't Hoff's factor (i) is,KCET 2016 Easy