Which of the following structures help a cactus plant to reduce water loss through transpiration?

Flowers

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Small roots

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Petioles

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Spines

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Solution

The correct option is D Spines
The desert plants grow in water scarce areas. Hence, the leaves of cactus is modified into spines or needle like leaves to conserve water by minimising transpiration. A waxy coating is also found on the stem of these plants which reduces evaporation of water. The fleshy stems store water and food in cactus.

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Fill in the blanks :

(a) Transpiration is the loss of water as water..................... from the .............parts of the plant.

(b) Closing of...................and shedding of leaves reduce.................

(c) Transpiration helps in creating .......................force and in eliminating excess...............................

Name the following :

(a) Openings on the stem through which transpiration occurs.

(b) The process by which the intact plant loses water in the form of droplets.

(d) A plant in which the stomata are sunken.

(e) The apparatus to record the rate of transpiration in a cut shoot.

(f) Any two parts of a leaf which allow transpiration.

(g) The structure in a leaf that allows guttation.

(h) Loss of water as droplets from the margins of certain leaves.

Complete the following sentences with the help of the given words: waxy, spines, stem, absent, transpiration

(1) In a cactus plant, the leaves are either ___ or reduced to spines and these help plants to reduce water loss through ___.

(2) ___ performs photosynthesis in the cactus plant.

(3) Stem is covered with a thick ___ layer to retain water.

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