Biology
A biology teacher asked her students to mention two conditions that favour cross-pollination.
Atul said: Herkogamy and Heterostyly.
Ritu said: Bisexuality and self-sterility.
Rahul said: Homogamy and Herkogamy.
Anaya said: Unisexuality and Dichogamy.
Who were correct?
- Atul and Anaya
- Atul and Ritu
- Anaya and Rahul
- Ritu and Rahul
Answer
Atul and Anaya
Reason — Cross-pollination is the transfer of pollen from the anther of one flower to the stigma of a flower on a different plant. Adaptations for cross pollination are: -
Herkogamy – Physical barrier between anther and stigma.
Heterostyly – Styles and stamens of different lengths in flowers.
Unisexuality – Male and female flowers on different plants.
Dichogamy – Anthers and stigma mature at different times.
Related Questions
Wing and keel petals are found in the flowers of:
- Pea plants
- Vallisneria
- Maize plants
- Dahlia
Which of these does not belong to the embryo sac of a flower?
- Generative nucleus
- Antipodal cells
- Polar Nuclei
- Synergids
Look at the table given below and identify the kind of pollination that usually occurs in the flower mentioned.
Flower Kind of pollination Hibiscus P Hydrilla Q Wheat R - P — Entomophily, Q — Hydrophily, R — Anemophily
- P — Hydrophily, Q — Elephophily, R — Anemophily
- P — Ornithophily, Q — Anemophily, R — Elephophily
- P — Ornithophily, Q — Hydrophily, R — Entomophily
Assertion (A): Autogamy and allogamy are the two kinds of self-pollination.
Reason (R): Self-pollination occurs within the same flower or two flowers of the same plant.
- A is True and R is False.
- A is False and R is True.
- Both A and R are True.
- Both A and R are False.