Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology the leaf plant adaptation and modification leaves leaf modification

Which of following is incorrect for trichomes?

  1. Trichomes are leaf modifications which minimize water loss

  2. Usually multicellular

  3. They may even be secretory

  4. Help in water absorption
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  1. Nitrogen

  2. Oxygen

  3. Carbon dioxide

  4. Both a and b
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Trace gases are those present in very small concentrations in the atmosphere. Carbon dioxide is considered a trace gas, whereas Nitrogen and Oxygen are major components.

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

Weather is predicted by considering 

  1. The movement of air

  2. Amount of water vapour

  3. Temperature

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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. 

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

Major component of the atmosphere on venus and mars planets is

  1. Carbon dioxide

  2. Oxygen

  3. Hydrogen

  4. Water vapours
Reveal answer Fill a bubble to check yourself
A Correct answer
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.