MCQ for ICAR-JRF/SRF, ICAR-UG, NET, IBPS-AFO, CUET-PG, AAO, FCI, IFFCO, FSO, JET, State exams, Agriculture Supervisor, and other agriculture competitive exams.

Atmospheric humidity, also known as relative humidity (RH), is the ratio of the amount of moisture present in the air to the saturation capacity of the air at a particular temperature. It is an important factor that affects crop production as it influences the water requirement of crops, and can also affect transpiration rate, photosynthesis, and absorption of water and nutrients by plants. High relative humidity can also increase the chance of outbreaks of pests and diseases. Most crop plants perform well in a relative humidity range of 40-60%, while very few crops can tolerate high relative humidity (80% and above). High relative humidity can also cause soil evaporation to stop. It is important to understand the effects of relative humidity on crop growth and development in order to optimize crop yields.

Factors affecting crop production – Atmospheric Humidity (Relative Humidity – RH) MCQ

1. What is relative humidity?
a) The amount of moisture present in the air
b) The ratio between the amount of moisture present in the air to the saturation capacity of the air at a particular temperature
c) The amount of moisture present in the soil
d) The amount of moisture present in the water
Answer: b) The ratio between the amount of moisture present in the air to the saturation capacity of the air at a particular temperature

2. What is the meaning of 100% relative humidity?
a) The entire space is filled with water
b) There is no water present in the air
c) The air is at its saturation point
d) The air is dry
Answer: a) The entire space is filled with water

3. How does relative humidity influence the water requirement of crops?
a) It has no effect
b) It increases the water requirement
c) It decreases the water requirement
d) It affects the water requirement
Answer: d) It affects the water requirement

4. What is the suitable range of relative humidity for most crop plants?
a) 30-50%
b) 40-60%
c) 50-70%
d) 60-80%
Answer: b) 40-60%

5. What is the effect of high relative humidity on crop growth and development?
a) It has no effect
b) It increases crop growth and development
c) It decreases crop growth and development
d) It increases the chance of outbreak of pest and disease

Answer: d) It increases the chance of outbreak of pest and disease

6. How does relative humidity affect the transpiration rate of plants?
a) It has no effect
b) It increases transpiration rate
c) It decreases transpiration rate
d) It affects transpiration rate
Answer: d) It affects transpiration rate

7. At what relative humidity level does soil evaporation occur?
a) 100%
b) 80%
c) 60%
d) below 100%
Answer: d) below 100%

8. Which of the following crops are known to perform well in high relative humidity (80% and above)?
a) Rice
b) Wheat
c) Barley
d) Very few crops
Answer: d) Very few crops

9. How does high relative humidity affect the photosynthesis process of plants?
a) It has no effect
b) It increases photosynthesis
c) It decreases photosynthesis
d) It affects photosynthesis
Answer: d) It affects photosynthesis

10. How does relative humidity affect the absorption of water and nutrients by plants?
a) It has no effect
b) It increases absorption
c) It decreases absorption
d) It affects absorption
Answer: d) It affects absorption