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

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Solution:

Some trees of hill like oak, ash, elm, hickory, pecan and mountain cedar produce allergic pollen grains which cause allergy to people. The signs and symptoms of pollen allergy are
- sneezing
- itching eyes, nose and throat
- dark circles under the eyes caused by restricted blood flow near the sinuses
- watering eyes
- conjunctivities
Conifer trees produce a large quantity of wind borne pollen grains because many pollen grains are destroyed in the process of pollination done by wind.