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प्रश्न
What are chasmogamous flowers?
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उत्तर
There are two types of flowers present in plants, namely Oxalis and Viola.
Both chasmogamous and cleistogamous flowers are present in plants. Chasmogamous flowers have exposed anthers and stigmata, similar to the flowers of other species.
APPEARS IN
संबंधित प्रश्न
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 ?
Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.
Why angiosperm anthers are called dithecous?
Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
Enlist advantages and disadvantages of cross pollination
Fill in the blank:
Male sex cells in plants are called _________.
Find the odd-one out, giving reason:
Ovary, style, pollen grain, stigma
Define the term Pollinating.
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.
State the name of the chief pollinating agent against the corresponding plant by choosing from those given in brackets.
Dahlia_______ .
Give one word/term for the following:
When stigma and anthers do not grow up to the same height, which favors only cross-pollination.
Type of interaction where an individual sacrifices its own welfare (life) for the benefit of another animal of its own species is ______.
Differentiate between geitonogamy and xenogamy (allogamy).
Coelacanth was caught in South Africa. State the significance of the discovery of Coelacanth in the evolutionary history of vertebrates.
Differentiate Between Cross Pollination and Self Pollination:
The question has four options. Choose the correct answer:
Pollination by insect is known as
Explain water pollination in detail with its types.
Give an account of various abiotic agencies used in pollination along with their adaptations for pollination.
For which of the following attractants and rewards are required?
Which of the following pair has haploid structures?
Heterostyly as a contrivance for cross-pollination is found in ______.
The flower which possesses both androecium and gynoecium is called perfect or ______.
The flower which does not open at all are called ______.
In which one of the following pollination is autogamous?
Describe any three adaptations in hydrophilous flowers.
Mention any one example of the hydrophilous flower.
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 | ______ |
