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प्रश्न
Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
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उत्तर
Cross-pollination cannot occur in cleistogamous flowers. Cleistogamous flowers do not open at all. In these flowers, the anthers and stigma are close together; when the anthers dehisce in the flower buds, pollen grains touch the stigma, resulting in pollination. As a result, these flowers are always self-pollinated since they remain closed, and cross pollen cannot land on the stigma. Cleistogamous flowers can pollinate and set seeds without pollinators.
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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.
A flower of tomato plant following the process of sexual reproduction produces 200 viable seeds.
Answer the following questions giving reasons :
(a) What would have been the minimum number of ovules present in pre-pollinated pistil ?
(b) How many microscope mother cells would minimally be required to produce requisite number of pollen grains ?
(c) How many pollen grains must have minimally pollinated the carple ?
(d) How many male gametes would have used to produce these 200 viable seeds ?
(e) How many megaspore mother cells were required in this process ?
Mention two strategies that evolved to prevent self-pollination in flowers.
Write two ways in which pollination may occur in plants.
Define the term Pollinating.
Exine and intine are the parts of
Fill in the blanks with suitable words.
Different timings for the maturation of gynoecium and androecium is called ________.
Name of the parts of the ovary which give rise to:
Fruit wall ______
Give one word/term for the following:
When stigma and anthers do not grow up to the same height, which favors only cross-pollination.
Describe the advantages and disadvantages of cross-pollination to the plant.
In bisexual flowers, maturation of gynoecium before androecium is known as ______.
Type of interaction where an individual sacrifices its own welfare (life) for the benefit of another animal of its own species is ______.
What is a flower? Draw a typical flower and label its different parts.
Differentiate Between Cross Pollination and Self Pollination:
Describe the Advantages and Disadvantages of self-pollination to the Plant.
What are the adaptations which are required in cross-pollinated
What are the adaptations which are required in self-pollinated plants?
Give an account of any two biotic agents for pollination along with their adaptations.
Pollination occurs in ______.
Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in ______.
During Hybridization process anther of the bisexual flower is removed before it dehisces is called ______.
Complete the following table:
| Sr. | Type of pollination | Agent | Kind of flower | Examples |
| (i) | ______ | Wind | ______ | Maize |
| (ii) | Chiropterophily | ______ | Dull colour, with strong fragrance, abundant nectar | Adansonia |
| (iii) | Entamophily | Insects | ______ | Rose/Jasmine |
| (iv) | Ornithophily | ______ | Brightly coloured, large and showy. They secrete profuse, dilute n ectar | ______ |
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:
Which one of the following flower is hypohydrophilous?
What is the definition of pollination?
Geitonogamy is characterized by which of the following?
Autogamy refers to which type of pollination process?
