Medical
Biology
Transport In Plants
Complex tissue Xylem
Phloem
Question
(a) An outline sketch of a tree is shown in the diagram below. Study the same and answer the questions that follow :
(i) Name the phenomenon that is labelled A in the diagram.
(ii) Explain the phenomenon occurring in A.
(iii) What is the importance of this phenomenon in plants ?
(iv) Explain the role of any three external factors that will increase the rate of the phenomenon.
(v) What do the direction of arrows in B and C indicate ?
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Solution
Answer-
(1) Transpiration
(2) Transpiration is the process of evaporation of water from aerial parts like leaves, and stems.
Roots consume some amount of water from the soil and the rest evaporates in the atmosphere. Parts of plants such as stems, small pores on leaves, and flowers evaporate the water into the atmosphere. In other words, it is the process in which water evaporates in the atmosphere from plant leaves and other parts.
Roots consume some amount of water from the soil and the rest evaporates in the atmosphere. Parts of plants such as stems, small pores on leaves, and flowers evaporate the water into the atmosphere. In other words, it is the process in which water evaporates in the atmosphere from plant leaves and other parts.
(3) It helps in water transport, cools the plant and maintains turgidity of the cells.
(4) Factors that increase transpiration :
(A) Temperature.
(B) Air movement.
(C) Light intensity.
(5) Water movement in plants is through osmosis from the roots to the stems and other aerial parts is indicated by the arrow.