Advertisements
Advertisements
प्रश्न
Choose the correct statement from the following:
पर्याय
Cleistogamous flowers always exhibit autogamy.
Chasmogamous flowers always exhibit geitonogamy.
Cleistogamous flowers exhibit both autogamy and geitonogamy.
Chasmogamous flowers never exhibit autogamy.
Advertisements
उत्तर
Cleistogamous flowers always exhibit autogamy.
Explanation:
Cleistogamous flowers never open, so pollen from other plants cannot reach their stigma. This means they are always pollinated by their pollen, ensuring self-pollination (autogamy). This mechanism does not rely on external pollinating agents, making autogamy guaranteed in cleistogamous flowers.
APPEARS IN
संबंधित प्रश्न
With the help of a suitable example, explain protandry.
Why angiosperm anthers are called dithecous?
Can cross-pollination occur in cleistogamous flowers? Give reason for your answer.
Mention two strategies that evolved to prevent self-pollination in flowers.
What is the bagging technique?
What is meant by emasculation?
Add a note on pollination mechanism in Salvia.
Fill in the blank:
Male sex cells in plants are called _________.
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.
When maturation time of reproductive parts in a flower is different.
Give one word/term for the following:
When stigma and anthers do not grow up to the same height, which favors only cross-pollination.
Give one word/term for the following:
Pollination of flowers by insects.
Give four adaptations shown by flowers pollinated by wind.
Answer the following question.
Express the process of pollination in Vallisneria.
Coelacanth was caught in South Africa. State the significance of the discovery of Coelacanth in the evolutionary history of vertebrates.
What is a flower? Draw a typical flower and label its different parts.
Pollination occurs in ______.
Which of the following pair has haploid structures?
During Hybridization process anther of the bisexual flower is removed before it dehisces is called ______.
Insect pollinated flowers are ______.
In the dioecious aquatic plant shown, identify the characteristics of the male flowers that reach the female flowers for pollination:
| Size of the flower | Colour of flower | The characteristic feature of pollen grain | |
| A | small | brightly coloured | Lightweight and non-sticky |
| B | large | colourless | large and sticky |
| C | small | white | small, covered with mucilage |
| D | large | colourless | non-sticky |
Pollination refers to the ______.
What is ornithophily?
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?
Mention any one example of the anemophilous flower.
Describe any three adaptations in hydrophilous flowers.
Mention any one example of the hydrophilous flower.
What are the major abiotic factors that influence habitat?
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 | ______ |
