Temperature

What is the importance of the length of the thermal growing season for plant growth?

• It determines the amount of rainfall a plant receives

• It ensures temperatures are warm enough for survival and growth

• It prevents all crops from being damaged by frost

• It increases the rate of evaporation

The period during which crops are not damaged by frost is called the _________.

• frost-free period

• growing season

• dormant period

• harvest time

Which of the following is a result of higher temperatures on evaporation?

• Decreases crop water requirements

• Increases the rate of evapotranspiration

• Reduces the need for sunlight

• Lowers the rate of biochemical reactions

Higher temperatures generally increase the rate of biochemical reactions involved in photosynthesis and plant growth.

• True

• False

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

• To increase crop yield

• To maintain a constant internal body temperature

• To reduce evaporation

• To prevent frost damage

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

• frosts

• droughts

• earthquakes

• heat waves

Which of the following methods can be used to prevent frost damage in orchards during the flowering period?

• Burning gas, oil, or candles in the orchards

• Increasing rainfall

• Reducing sunlight

• Planting more trees

Transparent woven plastic cloth over fields helps to retain _______ air close to the ground and protect crop seedlings.

• warm

• cold

• dry

• moist

What is the effect of brighter light on the rate of photosynthesis?

• Brighter light produces more rapid photosynthesis.

• Brighter light slows down photosynthesis.

• Brighter light has no effect on photosynthesis.

• Brighter light stops photosynthesis completely.

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

• True

• False