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Function of filiform apparatus is to
Filliform apparatus is the finger-like pojections of synergids which are helps in the absorption and conduction of food materials from nucleus into embryo sac and directs the pollen tube towards embryo sac by secreting some chemicals.
Non-albuminous seed is produced in
Non-albuminous or non-endospermic seeds are those in which cotyledons are usually smaller and less developed. Such seeds are termed when most or all of the endosperm is used up much before germination. Thus, out of all examples given in the option, the non-albuminous seed is produced in pea (i.e, Pisum sativum)
Which one of the following statement is correct?
Tapetum is the innermost layer of microsporangium. It nourishes the pollen grains. The inner wall of pollen grain is called intine. Endothecium is the wall around the microsporangium, which provide protection and help in dehiscence of anther to release the pollen. Sporogenous tissue is diploid. It undergoes meiotic division to form microspore tetrads.
Product of sexual reproduction generally generates
Sexual reproduction leads to new genetic combination leading to variation in new products. Longer viability of seeds prolonged dormancy and large biomass are not related to sexual reproduction.
An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is
Sporopollenin is a fatty substance present in the exine of pollen grains. It is resistant to microbial and chemical decomposition and can withstand the extreme environmental conditions. Due to presence of sporopollenin, pollen grains are well preserved during fossilization.
Even in absence of pollinating agents seed-setting is assured in
Commellina benghalensis or kankauoa bears aerial, chasmogamous (stigma and anthers exposed to pollinating agents), insect pollinated flowers and underground cleistogamous flowers. Cleistogamous flowers are bisexual flowers which never open, i.e., always remain closed. In such flowers the anthers and stigma lie very close to each other. When anthers dehisce in the flower buds, pollen grains come in contact with the stigma of the same flower, i.e., autogamy occurs. So, these flowers produce assured seed set, even in the absence of pollinators.
The coconut water and the edible part of coconut are equivalent to
The coconut water obtained form the tender coconut is nothing but free nuclear endosperm (made up of thousands of nuclei) and the surrounding white kernel is the cellular endosperm.
Filiform apparatus is a characteristic feature of
Filiform apparatus is finger-like projection of the cell membrane of synergids or help cells at the micropylar end of the ovule. Filiform apparatus is rich in polysaccharides and chemottracts pollen tube towards micropyle.
What would be the number of chorosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?
The outermost cell layer of the endosperm (3n) of seed is called aleurone layer. Since the cells of aleurone layer are triploid, the number of chromosomes would be = 63, as root tip cells (2n) has 42 chromosomes.
Wind pollination is common in
Pollination by wind (anemophily) is more common amongst abiotic pollinations. Wind pollination is quite common in grasses.
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