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FAQs on Mind Map - Transport in Plants - NEET
| 1. What is the process of transport in plants? |  |
Ans. Transport in plants refers to the movement of water, nutrients, and other substances throughout the plant's body. It occurs through two main pathways: the xylem and the phloem. The xylem transports water and minerals from the roots to the leaves, while the phloem transports sugars and other organic compounds from the leaves to the rest of the plant. This process is essential for the plant's growth, nutrition, and overall function.
| 2. How does water move in plants? | |
Ans. Water moves in plants through a process called transpiration. Transpiration occurs when water evaporates from the leaves through small openings called stomata. This creates a negative pressure, or tension, in the xylem, pulling water up from the roots. Additionally, water molecules are cohesive, meaning they stick together, allowing them to form a continuous column in the xylem. This cohesion, along with the tension created by transpiration, helps to pull water upwards against gravity.
| 3. What are the factors affecting the rate of transpiration in plants? | |
Ans. Several factors can affect the rate of transpiration in plants. These include:
1. Temperature: Higher temperatures increase the rate of transpiration as it accelerates the evaporation of water from the leaves.
2. Humidity: Higher humidity levels reduce the rate of transpiration since the air already contains a significant amount of moisture.
3. Wind: Increased air movement increases the rate of transpiration by removing the water vapor surrounding the leaves.
4. Light intensity: Higher light intensity can increase the rate of transpiration as it stimulates the opening of stomata.
5. Leaf surface area: Plants with larger leaf surface areas tend to have higher rates of transpiration.
| 4. How do plants transport nutrients from the roots to other parts of the plant? | |
Ans. Plants transport nutrients from the roots to other parts of the plant through the process of active transport. Active transport involves the movement of ions against their concentration gradient with the help of carrier proteins in the root cells. This requires energy in the form of ATP. Once the nutrients are absorbed by the root cells, they are transported through the xylem or phloem to other parts of the plant. The xylem transports water and minerals, while the phloem transports organic compounds like sugars.
| 5. What is the role of the endodermis in plant transport? | |
Ans. The endodermis is a specialized layer of cells in the roots that plays a crucial role in plant transport. It forms a barrier called the Casparian strip, which prevents the passive movement of water and solutes between cells. This forces water and nutrients to pass through the selectively permeable plasma membrane of the endodermal cells. It allows the plants to regulate the uptake of minerals and water, ensuring that only necessary substances are transported to the xylem and ultimately to the rest of the plant.
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