Test: Transpiration - Class 10 MCQ

Guard cells are responsible for regulating the opening and closing of stomata. This control is essential for managing water loss through transpiration and allowing gas exchange for photosynthesis.

One of the primary purposes of transpiration is to cool the plant. As water evaporates from leaf surfaces, it helps to lower the leaf temperature, preventing overheating.

Increased atmospheric carbon dioxide levels can lead to stomatal closure, which decreases the rate of transpiration. This is a plant's response to reduce water loss when CO2 levels are elevated.

As air temperature increases, the rate of transpiration also increases. Warmer air can hold more water vapor, facilitating the evaporation process from plant surfaces.

Guttation is the process where water appears as tiny droplets along the margins or tips of leaves, usually occurring when the plant takes up more water than it can transpire.

Cuticular transpiration refers to water vapor escaping directly from the surface of leaves and stems through the cuticle, contributing to overall water loss in plants.

Stomatal transpiration occurs primarily through the stomata, which are tiny openings on the leaf surface. These openings facilitate the release of water vapor, making leaves the key organs for this process.

Developing needle-like leaves is an adaptation that helps reduce water loss in plants, as these structures have a smaller surface area, minimizing transpiration.

Lenticular transpiration occurs through lenticels, which are small openings found on older stems, allowing for gas exchange and water vapor loss.

The key difference is that transpiration involves the loss of water vapor from the plant, while bleeding refers to the loss of liquid cell sap through cuts in the plant stem, often occurring when plants are under stress.

Transpiration specifically refers to the loss of water vapor from the aerial parts of plants, while evaporation is the process of water turning into vapor from surfaces, such as lakes or rivers.

High humidity levels in the air would decrease the rate of transpiration because the moist air reduces the gradient for water vapor to escape from the plant.

Transpiration is the process by which plants release water vapor from their aerial parts, such as leaves and stems. This process plays a crucial role in regulating water loss and maintaining plant health.

Many plants in dry climates develop thick, waxy cuticles to minimize water loss through transpiration. This adaptation helps them retain moisture in arid environments.

In Setup A, water vapor condensed on the inner walls of the bell jar, demonstrating that transpiration is occurring. This setup illustrates how water vapor released by plants can lead to condensation.

A potometer measures the rate of transpiration by tracking the movement of air bubbles in a capillary tube, which correlates with the water uptake by the plant. This indirectly reflects the rate of water loss through transpiration.

Aqueous transpiration is not a recognized type of transpiration. The main types are stomatal, cuticular, and lenticular transpiration, each involving different processes of water vapor release.

In Setup B, the cobalt chloride paper, which starts blue, turns pink upon exposure to water vapor, indicating that transpiration is occurring, as the paper changes color in response to moisture.

High humidity levels actually reduce the rate of transpiration because the air is already saturated with moisture, making it harder for water vapor to escape from the plant.

Turgor pressure helps push water out of the cells into intercellular spaces, where it can then evaporate into the atmosphere through the stomata, facilitating transpiration.