Question:
The chief function of sieve tube element is:
The chief function of sieve tube element is:
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EXPLANATION:
- Sieve tubes are specialized cells found inside the phloem tissue of plants.
- Their prime function is to transport organic materials from photosynthetic( leaves) parts of plants to non-photosynthetic (flowers, fruits) parts of plants.
- To ensure proper growth and nurturing of those parts.
- The sieve tube cells do not have a nucleus, which allows cells to transport more nutrients within them.
- Sieve tubes are arranged from end to end to ensure a continuous flow of organic material from the source to the sink of the plant.
- Other functions given in options like conducting minerals, forming wood, and transporting water from roots & leaves are all performed by other special tissues in plants. They are called "Xylem”.
Updated On: Mar 27, 2024
- to conduct minerals
- to help the plant in forming wood
- to transport water from roots to leaves
- to translocate the organic material from source to sink
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The Correct Option is D
Solution and Explanation
The chief function of sieve tube elements is to translocate the organic material from the source to sink.
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Concepts Used:
Transport of Water and Minerals in Plants
Transportation is the process of movement of water and minerals to all parts of the plant body. Plants have a specialized system that enables them to distribute water and nutrients throughout their body. They use several processes such as translocation, absorption, storage and utilization of water.
Transportation in Plants:
The water and minerals are transported in plants by two types of conducting tissues:
- Xylem: The xylem distributes water and dissolved minerals upward through the plant, from the roots to the leaves.
- Phloem: The phloem carries food downward from the leaves to the roots.
The three modes of transportation:
- Diffusion: The molecules in this system travel from a high-concentration region to a low-concentration region. This procedure does not necessitate the use of any energy.
- Facilitated diffusion: With the help of a carrier, usually a protein, the mechanism transports molecules from an area of higher concentration to a region of lower concentration. Because this process does not require any energy, it is referred to as a passive process.
- Active Transport: With the help of membrane proteins, this mechanism transports molecules from a lower to a higher concentration region. Because it requires ATP to function, this system is referred to as active transport.