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Heat stress is the condition of major abiotic or environmental stress in which too much heat is absorbed by plants and restricts their growth and productivity. The several signs associated with heat stress to plants are leaf drop, blossom end rot, overwatering, bolting, and sunburn.

When water (liquid state) is lost through microscopic spores or stomata in plant leaves and changes to gaseous or vapors form, it is called evaporation.

Thus, plant leaves help in releasing vapor through stomata rather than responding to heat stress.

Therefore, the given statement is false.

The method that helps plants take in carbon dioxide (CO2) from the air with the help of gaseous exchange through stomata is called ventilation.

Thus, ventilation is the response of gaseous exchange in plants which is maintained through leaves.

Therefore, the given statement is false.

When there is a stressful situation like environmental stress (heat and high pressure), living cell synthesizes protein in response to the condition. This protein is called heat-shock protein.

Thus, heat-shock proteins are produced in response to severe heat stress and protect from protein degradation in plants.

Therefore, the given statement is true.

The form of fatty acid that comprises multiple carbon-carbon bonds with fewer hydrogen bonds is called unsaturated fatty acid. Examples of unsaturated fatty acids in plants are linoleic, oleic, and alpha-linolenic acids.

Thus, unsaturated fatty acids are required in plants to provide them nutritional advantages.

Therefore, the given statement is false.