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pollen grains can be stored for several ...

pollen grains can be stored for several years in liquid nitrogen having a temperature of

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Pollen grains can be preserved as fossil because

Solids can change into liquids on increasing the temperature.

Assertion : Exine of a pollen grain is made up of sporopollenin which is resistant to high temperature, strong acid or alkali as well as enzymatic degradation. Reason : Sporopollenin is absent in the region of germ pores.

Pollen grains have spiny exine to aid in

Which one of the following statements is not true? (a) Stored pollen in liquid nitrogen can be used in the crop breeding programme (b) Tapetum helps in dehiscence of anthers (c) Exine of pollen grains is made of sporopollenin (d) Pollen grains of many species cause severe allergies

The number of pollen grains, produced by each head inflorescene of family Asteraceae having 10 actinomorphic flowers (if each anther produces 20 pollen grains), are

Select the correct statements w.r.t pollen grain (a) Its sporoderm consists of exine and intine (b) Has exine whice helps in fossilization (c) Generally spherical shaped with about 25-50 um in diameter (d0 It can be stored in liquid N2 for years (e) Its viability does not depend on temperature and humidity.

"Pollen grains are protected by a mucilaginous covering and having a specific gravity." This is characteristic of which type of pollination (a) Anemophily (b) Entomophily (c) Hydrophily (d) Zoophily

If specific ehat capacity of a substance in solid and liquid state is proportional to temperature of the substance, then if heat is supplied to the solid intially at -20^(@)C (having melting 0^(@)C ) at contant rate. Then the temperature dependence of solid with time will be best represented by:

ALLEN-SEXUAL REPRODUCTION IN FLOWERING PLANTS-S
  1. pollen grains can be stored for several years in liquid nitrogen havin...

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  2. Which of the following statement is correct ?

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  3. Anther of angiosperm generally composed of

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  4. Many pollen tubes are formed during the germination of pollen grains i...

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  5. Pollinia are sac like structures

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  6. Main function of middle layer in microsporangium is

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  7. In which of the following Pollinia are formed ?

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  8. In monocots male gametophyte is represented by

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  9. How many microspores are formed from 10 microspore mother cells by mei...

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  10. Which type of dehiscence of anther is found in most of the Angiosperms...

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  11. Generally how many megaspores take part in the development of female g...

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  12. Reduction division in angiosperm occurs at the time of ?

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  13. Which structure of ovule, takes part in storage of food ?

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  14. Pericarp develops from

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  15. When ovule is straight so the funiculus, chalaza and micropyle lie in ...

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  16. In pea, which type of ovule is found?

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  17. Microscopic structure of the flower that contains vegetative cell ?

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  18. Polygonum type of embryosac is

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  19. The ploidy level of secondary nucleus of embryosac is :-

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  20. Syngamy means.

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  21. The double fertilization is the only characteristic of :-

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