(a) What is transpiration?
(b)(i) Name two types of transpiration
(ii) List two factors which affect the rate of transpiration.
(c) Describe the mechanisms of opening and closing of the stomata.
(d) State:
(i) two similarities and (ii) two differences between transpiration and sweating.
(a) Transpiration: - This is the loss of water; in vapour form; from the aerial parts/stomata/lentice/stem/leaf of a petal.
(b) (i) Types of transpiration: - stomatal transpiration. - lenticular transpiration - cuticular transpiration
(ii) Factors affecting rates of transpiration: - light intensity/light - temperature - wind - availability of soil water/water -humidity - leaf surface area - leaf structure/thick cuticle - sunken stomata/hairy/spiny - root system (deep/shallow roots)
(c) Mechanism of stomata! opening: -
(d) (i) Similarities between transpiration and sweating: -
(ii) Differences:
Transportation | sweating |
Occurs in plants through stomata/lenticles | occurs in mammals/skin/through sweat pores |
Transpiration involves only loss of water | loss of water, salts and nitrogenous waste |
water is lost in the form of vapour | water is lost in liquid form |
occurs during the day | occurs both day and night |
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