Biology
Assertion (A): The process of removal of anthers in young flowers is termed as 'emasculation'.
Reason (R): Emasculation is mainly performed during artificial pollination to produce the desired variety of the plants.
- 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.
Pollination
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Answer
Both A and R are True.
Reason — Emasculation is the process of removing anthers from a young flower to prevent self-pollination.
It is an important step in artificial hybridization, where the emasculated flowers are manually pollinated with pollen from a selected plant to develop desired varieties.
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Related Questions
Assertion (A): Entomophilous flowers are not brightly coloured and often dull green in colour.
Reason (R): The pollinating agents of entomophilous flowers are usually water, wind and birds.
- A is True and R is False.
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Assertion (A): One polar nucleus fuses with two sperm nuclei of a flower and develop into an endosperm during the process of fertilization.
Reason (R): The large central cell of the embryo sac contains two polar nuclei, which fuse with one male nucleus. This process is termed as 'triple fusion'.
- 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.
Given below is the internal structure of an ovule. Read the information below the diagram and fill in the blanks:
Ovule is located in the inner part of the ovary. It is destined to become the seed and the ovary to become the fruit. The number of ovules in the ovary vary from species to species. It can be one or more.
Each ovule has one or two protective coverings, the integuments. The integuments leave a small opening called the (a) …………… at one end. Enclosed by the integuments is the (b) ………………(a mass of food laden cells), and further inside it, is the embryo sac. Embryo sac contains one (c) …………… and two (d) …………… at one end. Three (e) …………… cells are found at the opposite end of embryo sac.
State the name of the chief pollinating agent against the corresponding plant by choosing from those given in brackets.
- Dahlia……(Crow, butterflies, mosquito).
- Maize…….(Bees, locusts, rain, wind).
- Vallisneria………(Wind, water, ants, rabbits).