101. Stomata open during day time due to
A. Decrease in pH
B. Decrease in weater potentia
C. Increase in water potential
D. Light
Answer : Option A
102. In tall trees water is absorbed due to
A. Transpiration
B. Root pressure
C. Capillary action
D. Photosynthesis
Answer : Option B
103. Which one is responsible for opening of stomata ?
A. Decrease in \(CO_2\) concentration and increse in \( H^+\) ion concentration.
B. Decrease in \(CO_2\) cone and decrease in \( H^+\) ion concentration.
C. Increase in \(CO_2\) cone and increase in \( H^+\) ion cone
D. More free \( H^+\) ions and less Cl- ions.
Answer : Option C
104. Cell wall shows
A. Semi permeability
B. Differential permeability
C. Complete permeability
D. Impermeability
Answer : Option A
105. Starch of guard cells is converted into PEP through.
106. Energy source responsible for upward flow of water is
107. Guard cells regulate
108. Most water flow in root occurs via apoplast as
A. Cortical cells are living cells
B. Cortical cells are loosely arranged
C. Cortical cells are thin walled
D. All the above
Answer : Option D
109. Major loss of water in transpiration occurs through
110. A negative effect of transpiration is
A. Development of water stress
B. Increase in mineral absorption
C. Maintanance of leaf temperature
D. Causing cooling
Answer : Option D