Advertisements
Advertisements
Question
What is self-incompatibility?
Solution
Sexual incompatibility occurs when a pistil with functioning female gametes fails to establish seeds after pollination with viable and fertile pollen capable of fertilising another pistil. Sexual incompatibility can arise between members of different species or within the same species. This is also known as self-incompatibility.
APPEARS IN
RELATED QUESTIONS
Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?
Describe the characteristic features of wind pollinated flowers.
Add a note on pollination mechanism in Salvia.
Fill in the blanks:
The two kinds of pollination are __________ and __________.
Which one of the following is one of the characteristics of self-pollinated flowers?
Fill in the blanks with suitable words.
Different timings for the maturation of gynoecium and androecium is called ________.
Give one word/term for the following:
When stigma and anthers do not grow up to the same height, which favors only cross-pollination.
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Pollination occurs in ______.
Chief pollinators of agricultural crops are ______.
Anemophily type of pollination is found in ______.
Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in ______.
Feathery stigma occurs in ______.
Which of these is a condition that makes flowers invariably autogamous?
Heterostyly as a contrivance for cross-pollination is found 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 ______.
Autogamy can occur in a chasmogamous flower if ______.
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?
Describe any three adaptations in hydrophilous flowers.