Temperature - Importance and Control

What is the importance of the length of the thermal growing season in agriculture?

• It is necessary for temperatures to be warm enough for survival and growth. Some crops can survive low temperatures but do not grow at temperatures below 5°C.

• It determines the amount of rainfall required for crops to grow.

• It affects the color of the crops produced during harvest.

• It is only important for tropical crops and not for temperate crops.

Which of the following crops is mentioned as being damaged by frost, making it unsuitable for areas with late frosts?

• Wheat

• Maize

• Rice

• Barley

Higher temperatures increase the rate of ________, which increases crop water requirements.

• evapotranspiration

• photosynthesis

• translocation

• germination

Biochemical reactions involved in photosynthesis and plant growth are generally increased by higher temperatures.

• True

• False

How do mammals and birds use food energy in relation to temperature?

• Mammals and birds use food energy to maintain a constant internal body temperature. Keeping the animals warm reduces heat losses and increases the amount of food energy put into growth.

• Mammals and birds use food energy only for movement, not for temperature regulation.

• Mammals and birds use food energy to cool their bodies below the surrounding temperature.

• Mammals and birds do not use food energy in relation to temperature at all.

Which of the following is NOT a method to control temperature in agriculture?

• Using greenhouses

• Burning fuel to heat greenhouses

• Using large fans in orchards

• Planting crops only in winter

Low lying areas such as valley bottoms are more likely to have ______ as cold dense air collects there.

• frosts

• droughts

• heat waves

• thunderstorms

In hot weather, buildings may need to be ______ to prevent overheating.

• ventilated

• insulated

• painted

• decorated

What effect does the intensity of light have on the rate of photosynthesis?

• It decreases the rate of photosynthesis

• It has no effect on photosynthesis

• It increases the rate of photosynthesis

• It only affects livestock

Photoperiodism (daylength) affects the growth and development of crops.

• True

• False