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501 questions in this collection · Page 6 of 51
Question 51 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The female gametophyte of a typical dicot is also known as:
Located in the nucellus is the embryo sac or female gametophyte.
Question 52 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
In the 8-nucleate stage of the embryo sac, the division is strictly:
These mitotic divisions are strictly free nuclear, that is, nuclear divisions are not followed immediately by cell wall formation.
Question 53 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The three cells grouped together at the micropylar end of the embryo sac constitute the:
Three cells are grouped together at the micropylar end and constitute the egg apparatus.
Question 54 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The large central cell of the embryo sac contains:
The large central cell, as mentioned earlier, has two polar nuclei.
Question 55 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Plants like Commelina produce:
Plants such as Viola, Oxalis, and Commelina produce two types of flowers – chasmogamous and cleistogamous.
Question 56 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Genetic self-incompatibility involves:
Self-incompatibility is a genetic mechanism that prevents self-pollen from fertilizing ovules by inhibiting pollen germination or pollen tube growth in the pistil.
Question 57 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which agent is most common for abiotic pollination?
Pollination by wind is more common amongst abiotic pollinations.
Question 58 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Wind-pollinated flowers often have:
Wind-pollinated flowers often have a single ovule in each ovary and numerous flowers packed into an inflorescence.
Question 59 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
In Vallisneria, female flowers reach the water surface by:
In Vallisneria, the female flower reach the surface of water by the long stalk.
Question 60 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Pollen grains of water-pollinated species are protected from wetting by:
In most of the water-pollinated species, pollen grains are protected from wetting by a mucilaginous covering.