Transport in plants

Question 1

Functions of phloem

Answer 1

transport sucrose and amino acids from leaves to other plants of the plant

Question 2

Disadvantages of wilting..

Answer 2

water available becomes the limiting factor, rate of photosynthesis decreases
Stomata closed, volume of CO2entering leaf deceases and SA of leaf exposed to light energy decreases, rate of photosynthesis decreases

Question 3

Holes in sieve tubes

Answer 3

allow rapid flow of sucrose of sucrose and amino acids through sieve tubes

Question 4

Translocation is..

Answer 4

transport of sucrose and amino acids through the phloem to other parts of the plant

Question 5

Functions of Xylem

Answer 5

Transport water and deserve mineral salts from the roots to the stems and leaves.
Provide mechanical support for the plant

Question 6

Empty hollow lumen of xylem

Answer 6

allows efficient transport of water and dissolved mineral salts from roots to leaves with reduced resistance

Question 7

Xylem cells bundles tgt

Answer 7

provide mechanical support for plant

Question 8

Root pressure is…

Answer 8

pressure resulting from the constant entry of water into roots

Question 9

Capillary action

Answer 9

effect in which water tends to move up inside a narrow tube due due to forces of cohesion and adhesion

Question 10

Wilting is…

Answer 10

Rate of transpiration is higher than the rate of absorption of water by roots. Cells lose turbot and become flaccid, causing plant to wilt

Question 11

Advantages of wilting is…

Answer 11

when leaf folds up, SA of leaf exposed to light energy decreases
Guard cells become flaccid and stomata close
Less water vapour molecules diffuse out of the leaf through stomata via diffusion
Rate of transpiration decreases

Question 12

Transpiration is…

Answer 12

loss of water vapour from stomata of the leaves

Question 13

Companion cells with many mitochondria

Answer 13

release energy needed for companion cells to load sucrose and amino acids from mesophyll cells to sieve tubes via active transport

Question 14

Water drawn up by transpiration can be used for..

Answer 14

Photosynthesis. Keep cells turgid. Replace water loss by cells

Question 15

Importance of transpirtation

Answer 15

draws water and mineral salts from roots to stems and leaves. Cools the plant. As water evaporates to water vapour from mesophyll cells in the leaves, it removes heat through latent heat of vaporisation

Question 16

Transpiration pull is…

Answer 16

suction force caused by transpiration