Advertisements
Advertisements
प्रश्न
What is self-incompatibility?
Advertisements
उत्तर
Sexual incompatibility occurs when a pistil with functioning female gametes fails to establish seeds after pollination with viable and fertile pollen capable of fertilizing another pistil. Sexual incompatibility can arise between members of different species or within the same species. The condition is also known as self-incompatibility.
APPEARS IN
संबंधित प्रश्न
Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?
Explain the post-pollination events leading to seed production in angiosperms.
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 ?
Can cross-pollination occur in cleistogamous flowers? Give reason for your answer.
Fill in the blank:
Male sex cells in plants are called _________.
Complete the following chart and rewrite.
| Sr.No. | Agencies | type of pollination |
| 1 | Water | .................... |
| 2 | ........................... | Entomophily |
| 3 | Bat | .................... |
| 4 | ....................... | Ornithophily |
(Or)
Explain outbreeding devices in angiospermic plants.
Fill in the blanks with suitable words.
_______ is a water-pollinated flower.
Name of the part of the ovary which gives rise to:
Fruit ______
Mention any two contrivances in flowers which favour cross-pollination.
Differentiate between geitonogamy and xenogamy (allogamy).
Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanations to your answer.
Name the two types of pollination.
Describe pollination. How many types of pollinations are found?
Describe the Advantages and Disadvantages of self-pollination to the Plant.
What are the adaptations which are required in self-pollinated plants?
Very short answer type question:
What is hydrophily?
At which stage pollen grains are shed from the anther in Angiosperms?
A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by ______.
Pollination by water occurs in ______.
A dioecious flowering plant prevents both ______.
Chief pollinators of agricultural crops are ______.
Even in absence of pollinating agents seed-setting is assured in ______.
Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in ______.
In some plants anther and stigma mature at the same time this condition is called ______.
The flower which possesses both androecium and gynoecium is called perfect or ______.
Which of the following plant contain unisexual flower?
The flower which does not open at all are called ______.
Correct definition of pollination is ______
What is hypohydrophily?
