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प्रश्न
What are chasmogamous flowers?
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उत्तर
There are two types of flowers present in plants, namely Oxalis and Viola.
Both chasmogamous and cleistogamous flowers are present in plants. Chasmogamous flowers have exposed anthers and stigmata, similar to the flowers of other species.
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संबंधित प्रश्न
Lever mechanism of pollination is observed in
- Salvia
- Jasmine
- Bougainvillea
- Butea
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.
Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?
List the different types of pollination depending upon the source of pollen gain.
Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.
Mention two strategies that evolved to prevent self-pollination in flowers.
Why does self-pollination not lead to seed formation in self-incompatible species?
Differentiate between the following:
Self pollination and cross pollination.
Define the term Pollinating.
Give one word/term for the following:
When stigma and anthers do not grow up to the same height, which favors only cross-pollination.
Give one word/term for the following:
Pollination of flowers by insects.
Mention any two contrivances in flowers which favour cross-pollination.
- Nucellus
- Antipodals
- Synergids
- Micropyle
Put a tick mark (✓) against the correct alternative in the following statements
Pollen is produced in the
Put a tick mark (✓) against the correct alternative in the following statements
Vegetative propagation is not observed in:
Describe pollination. How many types of pollinations are found?
Differentiate Between Cross Pollination and Self Pollination:
For which of the following attractants and rewards are required?
Which of the following pair has haploid structures?
Which of the following is not a water pollinated plant?
Insect pollinated flowers are ______.
Pollination refers to the ______.
Advantage of cleistogamy is:
Correct definition of pollination is ______
Choose the correct statement from the following:
Consider the following statements depicting adaptation of flowers to carryout successful pollination.
- Stigma is long, sticky and unwettable.
- Sepals, petals or perianth (if present) have waxy coating.
- Stamens with long filament and versatile anthers.
- Tubular corolla is seen.
- Flowers are noctumal.
Which of the above statements clearly depict hydrophily?
Briefly discuss any two methods by which plants avoid self-pollination.
Comparatively a large amount of pollen grains are wasted during ______.
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:
In sea grass, pollens are long, ribbon like and without exine exhibiting ______ pollination.
