Pollination Quiz - ICSE Class 5 Science
Free practice quiz: Pollination (ICSE Class 5 Science). 49 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following is the primary function of a stigma in a flower?
- To produce pollen grains
- To attract pollinators with its scent
- To receive pollen grains during pollination
- To protect the developing ovules
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Answer: C. To receive pollen grains during pollination
The stigma is the receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower. It is where pollen germinates. Therefore, its primary function is to receive pollen grains.
Flowers that are pollinated by water usually have:
- Bright colors and strong scents
- Small, inconspicuous flowers with no scent
- Sticky pollen and large stigmas
- Lightweight pollen that floats on the water surface
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Answer: D. Lightweight pollen that floats on the water surface
Water-pollinated (hydrophilous) flowers often produce pollen that is lightweight and adapted to float on the water's surface or be carried underwater. They typically lack bright colors or strong scents as these are not necessary for water pollination.
A flower that produces very little pollen, has a faint scent, and is not brightly colored is unlikely to be pollinated by:
- Wind
- Insects
- Birds
- Bats
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Answer: B. Insects
Insects are typically attracted by bright colors, strong scents, and nectar rewards. Flowers with faint scents and minimal pollen production are not usually adapted for insect pollination.
In water pollination, how is pollen typically dispersed?
- By birds flying over the water
- By wind blowing across the water surface
- By insects crawling on the water
- By gravity, falling into the water
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Answer: B. By wind blowing across the water surface
For many aquatic plants, pollination occurs when pollen is released onto the water's surface and then carried by wind or water currents to the stigmas of other flowers. Some plants release pollen underwater.
Which of the following adaptations helps a flower prevent self-pollination?
- Brightly colored petals
- Production of nectar
- Herkogamy (spatial separation of anthers and stigma)
- Production of abundant pollen
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Answer: C. Herkogamy (spatial separation of anthers and stigma)
Herkogamy is a physical or temporal barrier that prevents self-pollination. For example, if the stigma is positioned far from the anthers, or if they mature at different times (dichogamy), cross-pollination is favored.