What is the main advantage of apomictic seeds in agriculture?
If these hybrids are made into apomicts, there is no segregation of characters in the hybrid progeny. Then the farmers can keep on using the hybrid seeds.
Question 342 of 501
📘 CLASS XII
Which layer of the anther wall nourishes the developing pollen grains?
The innermost wall layer is the tapetum. It nourishes the developing pollen grains.
Question 343 of 501
📘 CLASS XII
The generative cell of a pollen grain is characterized by:
The generative cell is small... It is spindle shaped with dense cytoplasm and a nucleus.
Question 344 of 501
📘 CLASS XII
The vegetative cell of a pollen grain is characterized by:
The vegetative cell is bigger, has abundant food reserve and a large irregularly shaped nucleus.
Question 345 of 501
📘 CLASS XII
In over 60 percent of angiosperms, pollen grains are shed at which stage?
In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage.
Question 346 of 501
📘 CLASS XII
The inner wall of the pollen grain (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 347 of 501
📘 CLASS XII
Germ pores on the pollen grain are areas where:
Pollen grain exine has prominent apertures called germ pores where sporopollenin is absent.
Question 348 of 501
📘 CLASS XII
The basal part of the ovule is represented by the:
Opposite the micropylar end, is the chalaza, representing the basal part of the ovule.
Question 349 of 501
📘 CLASS XII
Which insect group is the dominant biotic pollinating agent?
Among the animals, insects, particularly bees are the dominant biotic pollinating agents.
Question 350 of 501
📘 CLASS XII
Flowers pollinated by flies and beetles typically secrete:
The flowers pollinated by flies and beetles secrete foul odours to attract these animals.
