Advertisements
Advertisements
Question
What are the different adaptations shown by bird-pollinated flowers?
Advertisements
Solution
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.
RELATED QUESTIONS
Lever mechanism of pollination is observed in
- Salvia
- Jasmine
- Bougainvillea
- Butea
Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?
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 ?
Fill in the blanks:
The two kinds of pollination are __________ and __________.
Coelacanth was caught in South Africa. State the significance of the discovery of Coelacanth in the evolutionary history of vertebrates.
Autogamy can occur in a chasmogamous flower if ______.
Cleistogamous flowers are ______.
Both chasmogamous and cleistogamous flowers are present in ______.
Name the following:
One plant each of Hypohydrophily and epihydrophily.
In sea grass, pollens are long, ribbon like and without exine exhibiting ______ pollination.
