What does the filiform apparatus do at the entrance into ovule?
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Solution
Filiform apparatus helps in the entry of pollen tube into a synergid in ovule.
Filiform apparatus is in form of finger like projection comprising a core of microfibrils enclosed in a sheath.The filiform apparatus resembles transfer cells meant for short distance movement of metabolites. The filiform apparatus responsible for the absorption of food from the nucleus.
Cotyledons and testa respectively are edible parts in
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Solution
Cotyledons and testa respectively are edible parts in groundnut and pomegranate. A cotyledon is a significant part of the embryo within the seed of a plant. Upon germination, the cotyledon may become the embryonic first leaves of a seedling. Testa is often thick or hard outer coat of a seed.
An example of a seed with endosperm, perisperm, and caruncle is
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Solution
An example of a seed with endosperm, perisperm, and caruncle is castor. Castor seed is the source of castor oil,which has a wide variety of uses.
Apomictic embryos in citrus arise from
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Solution
Apomixis is an asexual type of reproduction in which the plant embryos grow from egg cells without being fertilized by pollen-the male part of the plant. In citrus, apomictic embryos arise from maternal sporophytic tissue like nucellus and integuments in ovule. This type of embryony is called adventive embryony.
Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called
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Solution
Geitonogamy is the process of transfer of pollen grains from the anther to the stigma of another flower of the same plant. Example, maize.
The scutellum observed in a grain of wheat or maize is comparable to which part of the seed in other monocotyledons?
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Solution
Scutellum is the modified cotyledon observed in a grain of wheat or maize. It lies between embryo and the endosperm.
Wind pollinated flowers are
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Solution
Pollination by wind is called anemophily. Wind pollinated flowers are small in size,producing large number of dry pollen grains. Pollens are small, dry and light in weight.Grasses are anemophilous plants.
In which one of the following pollination is autogamous?
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Solution
Cleistogamy is autogamous pollination. When pollination and fertilization occur in unopened flower bud, it is known as cleistogamy. It ensures self-pollination and prevents cross-pollination.
Wind pollination is common in
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Solution
Wind pollination is common in grasses. Grasses produce large amount of pollen which reach to opposite sex for reproduction by the help of wind .
Both, autogamy and geitonogamy are prevented in –
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Solution
Papaya is dioecious i.e.male and female flowers occurs in separate plants so that it prevents both autogamy and geitonogamy (method of self pollination).