Home
Class 11
BIOLOGY
Assertion. Many visitors to the hills su...

Assertion. Many visitors to the hills suffer from skin and respiratory allergy problems.
Reason. Conifers trees produce a large quantity of wind-borne pollen grains.

A

If both Assertion and Reason are true and Reason is a correct explaintion of Assertion .

B

If both assertion and Reason are ture Reason are ture Reason is not a correct explanation of Assertion .

C

If Assertion is ture but Reason is false .

D

If both assertion and Reason are false .

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • BREATHING AND EXCHANGE OF GASES

    MODERN PUBLICATION|Exercise COMPETITION FILE (ADDITIONAL MULTIPLE CHOICE QUESTIONS:):|30 Videos

  • BREATHING AND EXCHANGE OF GASES

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST|14 Videos

  • BREATHING AND EXCHANGE OF GASES

    MODERN PUBLICATION|Exercise COMPETITION FILE (CBSE - PMT (MAIN EXAMINATION ) QUESTIONS :):|3 Videos

  • BODY FLUIDS AND CIRCULATION

    MODERN PUBLICATION|Exercise Chapter Practice Test|15 Videos

  • CELL : THE UNIT OF LIFE

    MODERN PUBLICATION|Exercise Chapter Practice Test (Section-E)|1 Videos

Similar Questions

Explore conceptually related problems

Assertion (A): Many visitors to the hills suffer from skin and respiratory allergy problems. Reason (R): Conifer trees produce a large quantity of wind- borne pollen grains.

Assertion : Conifer trees produce a large quantity of wind-borne pollen grains Reason : The pollen grains have wings.

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.

Assertion : To compensate the uncertainties and associated loss of pollen grains during pollination by abiotic agents, the flowers produce enormous amount of pollen when compared to the number of ovules available for pollination. Reason : Pollen grains coming in contact with the stigma is a chance factor in both wind and water pollination.

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.