Tag: biology

Questions Related to biology

Which of following is incorrect for trichomes?

biology the leaf plant adaptation and modification leaves leaf modification

  1. Trichomes are leaf modifications which minimize water loss

  2. Usually multicellular

  3. They may even be secretory

  4. Help in water absorption

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Correct Option: A
Explanation:

  • Trichomes are the epidermal outgrowths on the vegetative and reproductive parts of the plant. 
  • These are hair-like structures which may be unicellular or multicellular.
  • Some trichomes are secretory in nature and are known as glandular trichomes. For example, tannins, resins, gum etc., are some products secreted by trichomes.
  • Trichomes help in the absorption of water and minerals.
It is not a leaf modification, hence, option A is incorrect. So, the correct answer is 'Trichomes are leaf modifications which minimize water loss'.

The electrified region of the upper atmosphere is called the:

biology physical resources air and winds wind energy air as a natural resource

  1. Thermosphere

  2. Mesosphere

  3. Stratosphere

  4. Ionosphere

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Correct Option: D

What is percentages of N2 in atmosphere?

biology physical resources air and winds wind energy air as a natural resource

  1. 78.08%

  2. 77%

  3. 79%

  4. 80%

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Correct Option: A

How much pressure exerted by our atmospher?

biology physical resources air and winds wind energy air as a natural resource

  1. 11.7 pounds per square inch

  2. 13.7 pounds per square inch

  3. 14.7 pounds per square inch

  4. 12.7 pounds per square inch

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Correct Option: C

What is categorized as a trace gas in earth's atmosphere?

biology physical resources air and winds wind energy air as a natural resource

  1. Nitrogen

  2. Oxygen

  3. Carbon dioxide

  4. Both a and b

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Correct Option: C

What is 'pH' of fog down wind?

biology physical resources air and winds wind energy air as a natural resource

  1. 1.7

  2. 1

  3. 4

  4. 2

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Correct Option: A

Subsidence inversion is caused by sinking of air in

biology physical resources air and winds wind energy air as a natural resource

  1. Anticyclones

  2. Cyclones

  3. Hurricanes

  4. Typhoons

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Correct Option: A

What is atmospheric life of CO?

biology physical resources air and winds wind energy air as a natural resource

  1. 1 and a half month

  2. 8 and a half month

  3. 2 and a half month

  4. 5 and a half month

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Correct Option: C

Weather is predicted by considering 

biology physical resources air and winds wind energy air as a natural resource

  1. The movement of air

  2. Amount of water vapour

  3. Temperature

  4. All the above

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Correct Option: D
Explanation:

Accurate weather prediction can be made only if all the air measurements i.e. temperature, humidity and wind direction are considered. 

Moving air is known as the wind which is caused by differences in air pressure. It is the air which moves from an area or high pressure to an area of low pressure and causes the day to day changes in weather. Thus the wind brings in different air masses and different weather patterns. The greater the difference in air pressure, the greater is the wind speed. 
The amount of water vapour present in the atmosphere is known as humidity. The measure of the water vapour present in the atmosphere as compared to vapour content at saturation levels is known as relative humidity. The formation of clouds and rain occurs only at 100% relative humidity and not near the surface. The rising and cooling air forms clouds and increases humidity. The fall of precipitation from the clouds occurs into layers with lower humidity. 
The measure of air's hotness and coldness is known as temperature. Temperature affects the type of precipitation that can form. If the atmospheric conditions are such that precipitation can occur and the temperature is above freezing then rain occurs. If the temperature is below freezing then, snow formation occurs. 
Thus, the correct answer is option D. 

Major component of the atmosphere on venus and mars planets is

biology physical resources air and winds wind energy air as a natural resource

  1. Carbon dioxide

  2. Oxygen

  3. Hydrogen

  4. Water vapours

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Correct Option: A
Explanation:
Carbon dioxide is an important gaseous component of the environment. It is fixed by the green plants by the process of photosynthesis. It is released during expiration by the process of respiration. Venus is twin planet to earth as it has atmosphere. It is the hottest planet as its is made up of 97% carbon dioxide. Mars is also a planet which has atmosphere made up of 95.5% carbon dioxide.
So, the correct answer is option A.