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प्रश्न
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
विकल्प
Monoecious plant bearing unisexual flowers
Dioecious plant bearing only male or female flowers
Monoecious plant with bisexual flowers
Dioecious plant with bisexual flowers
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उत्तर
Dioecious plant bearing only male or female flowers
APPEARS IN
संबंधित प्रश्न
List the different types of pollination depending upon the source of pollen gain.
Name the part of the flower which the tassels of the corn- cob represent.
Why angiosperm anthers are called dithecous?
Differentiate between the following:
Self pollination and cross pollination.
Can a unisexual flower be self pollinated?
Exine and intine are the parts of
Mention any two contrivances in flowers which favour cross-pollination.
Answer the following question.
Write the difference in the characteristics of the progeny produced as a result of the two processes.
Coelacanth was caught in South Africa. State the significance of the discovery of Coelacanth in the evolutionary history of vertebrates.
- Nucellus
- Antipodals
- Synergids
- Micropyle
For which of the following attractants and rewards are required?
Pollination by water occurs in ______.
Pollination occurs in ______.
Heterostyly as a contrivance for cross-pollination is found in ______.
What is ornithophily?
Describe any three adaptations in anemophilous flowers.
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?
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 | ______ |
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:
In sea grass, pollens are long, ribbon like and without exine exhibiting ______ pollination.
