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प्रश्न
Why angiosperm anthers are called dithecous?
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उत्तर
Typical angiosperm anther is broad, terminal and bilobed. Each lobe of the anther has two pollen sacs which fuse (at maturity) to form a single chamber called the thecus, so it is called dithecous.
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संबंधित प्रश्न
As a senior biology student you have been asked to demonstrate to the students of secondary level in your school, the procedure(s) that shall ensure cross-pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each one of them.
Describe the characteristic features of wind pollinated flowers.
What are chasmogamous flowers?
Give the floral adaptations for anemophily.
Fill in the blanks with suitable words.
_______ is a water-pollinated flower.
Name of the parts of the ovary which give rise to:
Fruit wall ______
Describe the advantages and disadvantages of cross-pollination to the plant.
What are the adaptations which are required in self-pollinated plants?
Which one of these statements is incorrect?
The following statements seem to describe the water-pollinated submerged plants.
Identify the set of correct statements:
- The flowers of Vallisneria are colourful and produce nectar.
- The flowers of waterlily are not pollinated by water.
- In most of water-pollinated species, the pollen grains are protected from wetting.
- Pollen grains of some hydrophytes are long and ribbon like.
- In some hydrophytes, the pollen grains are carried passively inside water.
Choose the correct answer from the options given below:
