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.

A leaf-infecting fungus secretes a chemical that causes the guard cells to remain open thereby enabling the fungus to enter the plant tissue through the stomata. The most likely function of this chemical is

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?

The physiological phenomenon which is considered as necessary evil in plants is ____.

Take two plants, keep plant $\mathrm{A}$ in very dry conditions and plant $\mathrm{B}$ in high humidity. Simultaneously, immerse the roots of both plants in water with a red dye. What would you observe?

Which of the following have sunken stomata?

Cuticle is present in which type of plants?

The part labelled as A and B in the given diagram are 

Leaves of annual plants obtain ${\mathrm{O}}_2$ through

Given below is a diagram of the stomatal apparatus. Match the labels with the corresponding names of the compounds. 

Choose the correct combination.

Transpiration is controlled by factors:

Transpiration plays a significant role in the concept of __________.

Which is produced during water stress that brings about stomatal closure?

Which of the following amphistomatous leaves would dry up last?

Cobalt chloride is blue in anhydrous state. In contact with water vapors it turns
 

The energy source that mainly drives the upward flow of water in plants from roots to the shoots is

**Changes made in the question