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Long-distance transport of water , miner...

Long-distance transport of water , minerals , and food is generally carried out by

A

diffusion only

B

active transport only

C

mass flow system

D

cytoplasmic streaming supplemented by active transport

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The correct Answer is:
To solve the question regarding the long-distance transport of water, minerals, and food in plants, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Types of Transport in Plants**: - In plants, the transport of substances occurs primarily through vascular tissues, which consist of xylem and phloem. 2. **Understand the Role of Xylem**: - Xylem is responsible for transporting water and minerals from the roots to other parts of the plant. This transport is essential for the plant's hydration and nutrient supply. 3. **Understand the Role of Phloem**: - Phloem is responsible for transporting food (mainly sugars produced during photosynthesis) from the leaves to other parts of the plant where it is needed or stored. 4. **Evaluate the Given Options**: - **Diffusion**: This process involves the movement of substances from an area of higher concentration to an area of lower concentration. However, diffusion is not sufficient for long-distance transport in plants. - **Active Transport**: This process requires energy to move substances against their concentration gradient. While important for certain cellular processes, it does not provide enough energy for long-distance transport on its own. - **Mass Flow System (Bulk Flow)**: This system allows for the movement of substances in bulk due to pressure differences between two points. This is the primary mechanism for long-distance transport of water, minerals, and food in plants. - **Cytoplasmic Streaming with Active Transport**: While cytoplasmic streaming can help in the movement of substances within cells, it is not sufficient for long-distance transport when combined with active transport. 5. **Select the Correct Answer**: - Based on the evaluation, the correct answer for the long-distance transport of water, minerals, and food in plants is the **Mass Flow System (Bulk Flow)**. ### Final Answer: The long-distance transport of water, minerals, and food in plants is generally carried out by the **Mass Flow System**. ---
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