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501 questions in this collection · Page 2 of 51
Question 11 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The junction between the ovule and the funicle is called:
The body of the ovule fuses with the funicle in the region called hilum. Thus, hilum represents the junction between ovule and funicle.
Question 12 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The method of embryo sac formation from a single megaspore is termed as:
Only the functional megaspore develops into the female gametophyte (embryo sac). This method of embryo sac formation from a single megaspore is termed monosporic development.
Question 13 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
How many nuclei and cells are present in a typical mature angiosperm embryo sac?
A typical angiosperm embryo sac, at maturity, though 8-nucleate is 7-celled. It consists of an egg apparatus (3 cells), antipodals (3 cells), and a central cell (1 cell with 2 nuclei).
Question 14 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The cellular thickening at the micropylar tip of synergids that guides the pollen tube is called:
The synergids have special cellular thickenings at the micropylar tip called filiform apparatus, which play an important role in guiding the pollen tubes into the synergid.
Question 15 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Pollination which occurs within the same flower is termed:
In this type, pollination is achieved within the same flower. Transfer of pollen grains from the anther to the stigma of the same flower is called autogamy.
Question 16 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following plants produces both chasmogamous and cleistogamous flowers?
Some plants such as Viola (common pansy), Oxalis, and Commelina produce two types of flowers: chasmogamous flowers and cleistogamous flowers.
Question 17 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
What is the primary advantage of cleistogamy?
Cleistogamous flowers are invariably autogamous as there is no chance of cross-pollen landing on the stigma. They produce assured seed-set even in the absence of pollinators.
Question 18 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called:
Geitonogamy is the transfer of pollen grains from the anther to the stigma of another flower of the same plant. Genetically it is similar to autogamy.
Question 19 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which type of pollination brings genetically different types of pollen grains to the stigma?
Xenogamy is the transfer of pollen grains from anther to the stigma of a different plant. This is the only type of pollination which brings genetically different types of pollen grains to the stigma.
Question 20 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following is a characteristic of wind-pollinated flowers?
Wind pollination requires that pollen grains are light and non-sticky. The flowers often possess well-exposed stamens and large often-feathery stigma to trap air-borne pollen.