S.Y.B.Sc. Botany Paper-II (Plant Physiology) Quiz For Svm Someshwarnagar

Explanation
The statement is false because the K-pump hypothesis was not proposed by stewards.

Explanation
When the rate of transpiration increases, it leads to an increase in the rate of ascent of sap. This is because transpiration creates a negative pressure or tension in the leaf, which pulls water up from the roots through the xylem vessels. As more water is lost through transpiration, more water is pulled up from the roots to replace it, resulting in an increased rate of ascent of sap. Therefore, it can be concluded that when the rate of transpiration increases, the rate of ascent of sap also increases.

Explanation
Antitranspirants are substances that are used to reduce water loss in plants by forming a thin film on the leaves, which helps to minimize transpiration. In order to effectively reduce water loss, antitranspirants need to have properties that can potentially be toxic to plants. This is because they need to inhibit the normal functioning of the stomata, which are responsible for the exchange of gases and water vapor between the plant and its environment. Therefore, it is true that antitranspirants should be toxic to plants in order to fulfill their intended purpose.

Explanation
The statement suggests that if the leaf size is smaller, then transpiration increases. However, this is not true. In fact, larger leaf sizes tend to have more surface area available for transpiration, leading to higher transpiration rates. Smaller leaf sizes generally have less surface area and therefore lower transpiration rates. Therefore, the correct answer is False.

Explanation
Antitranspirants are substances used to reduce or prevent the loss of water through transpiration in plants. Since they are applied to plants, they should not cause any side effects or pollution. This is because antitranspirants are designed to be safe for plants and the environment. Therefore, the statement is true.

Explanation
In Morphological Dormancy (MD), embryos are not physiologically dormant. Instead, they are physically dormant, meaning their growth and development are temporarily halted. Physiological dormancy refers to a state where the embryo is metabolically inactive and requires specific environmental conditions to break the dormancy and resume growth. Therefore, the given statement is false.

Explanation
Gibberellic Acid (GA3) is a plant hormone that is commonly used to break seed dormancy. Seed dormancy is a natural mechanism that prevents seeds from germinating under unfavorable conditions, such as during the winter or in drought conditions. GA3 can be applied to seeds to stimulate germination by promoting the synthesis of enzymes that break down the inhibitors of germination. This allows the seed to overcome dormancy and begin the germination process. Therefore, the statement that GA3 is used to break seed dormancy is true.

Explanation
Warm stratification is not applied for seeds that mature embryos. Stratification is a process in which seeds are exposed to specific conditions (such as temperature and moisture) to break their dormancy and promote germination. Warm stratification is typically used for seeds with immature embryos, while cold stratification is used for seeds with mature embryos. Therefore, the statement is false.

Explanation
In the transpiration pull theory, loss of water through transpiration creates a suction or pulling force. As water evaporates from the leaves, it creates a negative pressure or tension in the xylem vessels, which pulls water up from the roots. This process is known as transpiration pull and is responsible for the upward movement of water in plants. Therefore, the statement that loss of water doesn't create suction or pulling force is false.

Explanation
Exudation refers to the process of fluid or substances leaking out of a tissue or structure, typically as a response to injury or inflammation. It is not specifically related to water escaping through structures. Therefore, the given statement is false.