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Pollen grains of many species cause seve...

Pollen grains of many species cause severe allergies & bronchial afflictions in some people often leading to chronic respiratory disorder such as :-

A

Asthma

B

Bronchitis

C

Both A & B

D

Emphysema

Text Solution

Verified by Experts

The correct Answer is:
C
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Assertion : Pollen grains of many species cause severe allergies and bronchial afflictions in some people leading to acute respiratory disorders-asthma, bronchitis, etc. Reason : In some members of Rosaceae, Leguminoseae and Solanaceae, pollen grains lose viability within 30 minutes of their release.

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Read the following text and answer the following questions on the basis of the same: A typical anther is bilobed. It is a tetragonal structure consisting of four microsporangia. These microsporangia form pollen sac which on maturity gets filled with a pollen grains. Pollen grains represent the male gametophytes, their cell wall is very hard. Pollen grains of many species cause severe allergies which cause various diseases in human beings. Select the odd one out with respect to wall layers of microsporangium in flowering plants.

In each microsporangium , pollen grains formed , are released with the_____ of anther. These pollen grains of some plants, like_____ cause allergies and bronchial afflictions. Choose the option with the pair of words which correctly fills the above blanks.

Read the following text and answer the following questions on the basis of the same: A typical anther is bilobed. It is a tetragonal structure consisting of four microsporangia. These microsporangia form pollen sac which on maturity gets filled with a pollen grains. Pollen grains represent the male gametophytes, their cell wall is very hard. Pollen grains of many species cause severe allergies which cause various diseases in human beings. The prominent pollen grain aperture called germ pore is present in

Read the following text and answer the following questions on the basis of the same: A typical anther is bilobed. It is a tetragonal structure consisting of four microsporangia. These microsporangia form pollen sac which on maturity gets filled with a pollen grains. Pollen grains represent the male gametophytes, their cell wall is very hard. Pollen grains of many species cause severe allergies which cause various diseases in human beings. Study of pollen grains is called ...........

Read the following text and answer the following questions on the basis of the same: A typical anther is bilobed. It is a tetragonal structure consisting of four microsporangia. These microsporangia form pollen sac which on maturity gets filled with a pollen grains. Pollen grains represent the male gametophytes, their cell wall is very hard. Pollen grains of many species cause severe allergies which cause various diseases in human beings. Assertion (A) : The innermost layer of microsporangium is called tapetum. Reason (R) : Tapetum nourishes the develop into pollen grains.

Name the chronic respiratory disorder caused mainly by cigarette smoking

MOTION-SEXUAL REPRODUCTION IN FLOWERING PLANTS-Exercise - 2
  1. Each cell of sporogenous tissue is potential pollen or microspore moth...

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  2. In over 60% of angiosperms pollen grains are shed at

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  3. Pollen grains of many species cause severe allergies & bronchial affli...

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  4. In a pollen grain the small cell is spindle shaped, with dense cytopla...

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  5. A typical angiosperm embryosac at maturity is :-

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  6. Arising from placenta is megasporangium which is commonly known as :

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  7. Single shield shaped cotyledon of grass is known as:-

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  8. Epicotyl has a shoot apex and few leaf primordia enclosed in a hollow ...

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  9. Although in most species fruits are result of fertilisation, there are...

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  10. Non albuminous seeds are present in :-

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  11. The coconut water from tender coconut that you are familiar with is :...

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  12. One of the male gamete moves towards the egg cell & fuses with its nuc...

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  13. Endosperm development precedes embryo development, the endosperm of an...

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  14. Transfer of pollen grains from the another to the stigma of another fl...

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  15. The part of pistil which acts as landing platform for pollen grain is

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  16. The inner most wall layer of anther is tapetum, the main function of t...

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  17. Two non motile male gametes in angiosperms are produced by :-

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  18. Alerone layer that is protein rich found in some cereals is a part of ...

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  19. In angiosperms functional megaspore generally develops at

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  20. When embroy develops from a haploid cellof embroysac , other than egg ...

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