Questions 1 and 2:

A pine cone is a natural hygrometer. When it is humid outside, the pine cone’s scales close up. When it is dry, the pine cone’s scales open up. How is this an indication of humidity?
__________
It’s very humid out. You put on sunglasses and get into an air-conditioned car. Your sunglasses fog up. Why does this happen?

Question

02-02-2021
Biology

contestada

Questions 1 and 2:

A pine cone is a natural hygrometer. When it is humid outside, the pine cone’s scales close up. When it is dry, the pine cone’s scales open up. How is this an indication of humidity?
__________
It’s very humid out. You put on sunglasses and get into an air-conditioned car. Your sunglasses fog up. Why does this happen?

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podgorica podgorica · Answer 1 · 2021-02-07T12:10:11+01:00

Answer:

a) Scales of pine closes and opens up with the variation in moisture content of air.

b) Cold sunglass meets warm moisture laden air and hence water droplet are suspended on the surface of sunglass.

Explanation:

a) Being a natural hygrometer, pine cone through its physiological activities indicate the presence of humidity in air.

The ridges of the pine consists of scales and the seed is inside it. In a humid environment, the scales absorbs moisture and swell and close the cone. This also prevents the seed from rotting due to excess moisture. With the reduction in moisture content of air, moisture in the scales of pine cone evaporates and the cone open up.

b) Sunglass gets cold since it is inside the airconditioned temperature of car. When the sunglass is placed outside the car window, moisture laden hot wind strikes the cold sunglass and it suspends its moisture there on the surface of glass as water droplets.