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501 questions in this collection · Page 11 of 51
Question 101 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The number of microsporangia in a typical dithecous anther is:
The anther is a four-sided (tetragonal) structure consisting of four microsporangia located at the corners.
Question 102 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The term used for the embryo entering a state of inactivity is:
The embryo may enter a state of inactivity called dormancy.
Question 103 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following is an example of albuminous seed?
Albuminous seeds retain a part of endosperm... e.g., wheat, maize, barley, castor.
Question 104 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
In a fertilized embryo sac, the haploid, diploid and triploid structures are:
Synergids are haploid (n), Zygote is diploid (2n), and PEN is triploid (3n).
Question 105 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Panchanan Maheshwari was a distinguished botanist who specialized in which field?
Panchanan Maheshwari... rose to become one of the most distinguished botanists... He worked on embryological aspects and popularised the use of embryological characters in taxonomy.
Question 106 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The inner wall of the pollen grain, the intine, is composed of:
The inner wall of the pollen grain is called the intine. It is a thin and continuous layer made up of cellulose and pectin.
Question 107 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Pollen products are consumed by athletes and race horses primarily because:
Pollen grains are rich in nutrients... Pollen consumption has been claimed to increase the performance of athletes and race horses.
Question 108 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following plants has a single ovule in the ovary?
The number of ovules in an ovary may be one (wheat, paddy, mango) to many (papaya, water melon, orchids).
Question 109 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following plants has many ovules in the ovary?
The number of ovules in an ovary may be one... to many (papaya, water melon, orchids).
Question 110 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
In a typical angiosperm ovule, the micropyle is formed by the absence of:
Integuments encircle the nucellus except at the tip where a small opening called the micropyle is organised.