Transpiration

Assertion: Waxy and cutin coating on plant parts reduce the transpiration.

Reason    : These adaptation are found in xerophytes.

Assertion: Light is a very important factor in transpiration.

Reason: Light induces stomatal opening and darkness closing of stomata. Therefore, transpiration increases in light and decreases in dark.

Read the following statements and choose the correct option 

Statement A: Stomata are absent in submerged hydrophytes.

Statement B : Respiration occurs by means of air chambers in submerged plants.

Stomatal movements are influenced by a number of environmental factors. Which of the following statements is/are incorrect regarding this?

(i) Blue light keeps stomata open during the day promoting the movement of $K^{+}$ ions into guard cells.
(ii) Increased ${\mathrm{CO}}_2$ concentration reduces the pH of guard cells which promotes conversion of sugar into starch, ultimately causing closure of stomata.
(iii) Abscisic acid, under stress conditions, causes rapid movement of $K^{+}$ ions into guard cells.
(iv) Highly concentrated sucrose or salt solution when applied over to stomata, results in stomatal opening.

Which is not the common factor for transpiration?

Lenticels are involved in

A. Most researchers agree that water is mainly 'pulled' upward through the plant, where transpiration is the driving force.

B. Less than one percent of water reaching the leaves is used in plant growth and photosynthesis.

C. Cobalt chloride paper turns blue on absorbing water.

According to potassium pump theory of Levitt

A. In dry atmosphere, the relative humidity is low, so the rate of transpiration increases

B. Slow breeze promotes the rate of transpiration
C. ABA promotes transpiration
D. A high salt concentration in soil water increases transpiration

The opening of stoma is aided due to the orientation of the microfibrils in the cell walls of the guard cells. These microfibrils are

In which of the following plants, stomata are not equally distributed on both surfaces of leaf?

According to the potassium pump theory which of the following phenomenon is responsible for closing of stomata in the dark?

All of the following properties of water are responsible for transpiration driven ascent of xylem sap in plants, except

Immediate cause of opening or closing of stomata is a change

The cohesion-tension transpiration pull model given by Dixon and Jolly explains

Maximum loss of water in the form of vapour occurs from

All are external environmental factors that affect transpiration, except

According to Dixon and Jolly theory, all given factors contribute to ascent of sap, except

Match the column-I with column-II and select the correct combination.

Which of the following cells play an important role in the transpiration other than guard cells?