Advertisements
Advertisements
Question
Give an account of any two biotic agents for pollination along with their adaptations.
Advertisements
Solution
- Angiosperms use biotic agents by feeding the visitors and exploiting their mobility for pollination and also for seed dispersal.
- Biotic agents include Birds, bats, insects, snail, etc.
- Birds: Small birds like Sun birds, humming birds perform ornithophily. Some ornithophilous plants are Bombax, Callistemon (Bottle Brush), Butea, etc.
Ornithophilous plants shows the following adaptations:
- Flowers are usually brightly coloured, large, and showy.
- They secrete profuse, dilute nectar.
- Pollen grains are sticky and spiny.
- Flowers are generally without fragrance, as birds have a poor sense of smell.
iv Bats (Chiropterophily)
Pollination carried out by bats is called chiropterophily.
Adaptations in chiropterophilous flowers:
- Flowers are dull coloured with a strong fragrance.
- They secrete abundant nectar.
- Flowers produce a large number of edible pollen grains.
- Chiropterophily is shown by plants like Anthocephalus (kadamb tree), Adansonia (Baobab tree), Kigelia (Sausage tree).
APPEARS IN
RELATED QUESTIONS
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.
Name the part of the flower which the tassels of the corn- cob represent.
Why does self-pollination not lead to seed formation in self-incompatible species?
What is meant by emasculation?
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.
Select and write the most appropriate answer from the given alternatives for the following subquestion:
A versatile anther is an adaptation for _______ type of pollination.
Feathery stigma occurs in ______.
What is ornithophily?
Which of the following floral adapation are adapted by hydrophilous flowers?
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:
