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Phloem Elements Video Lecture | Biology for ACT

FAQs on Phloem Elements Video Lecture - Biology for ACT

1. What are phloem elements?

Ans. Phloem elements are specialized tissues in plants that transport organic nutrients, such as sugars and amino acids, from the leaves to other parts of the plant. They are composed of various cell types, including sieve tube elements, companion cells, phloem fibers, and phloem parenchyma cells.

2. How do phloem elements function in plants?

Ans. Phloem elements function in plants by forming a network of tubes that allow the flow of sap, which contains organic nutrients, throughout the plant. The sieve tube elements, connected by sieve plates, form the main pathway for sap flow, while companion cells provide energy and support for the sieve tube elements.

3. What is the role of sieve tube elements in the phloem?

Ans. Sieve tube elements are the main transport cells in the phloem, responsible for the long-distance movement of sap. These cells are characterized by their elongated shape and lack of organelles, allowing for efficient flow of sap. They are connected end-to-end via sieve plates, which contain pores to facilitate the movement of nutrients.

4. How are companion cells related to phloem elements?

Ans. Companion cells are closely associated with sieve tube elements in the phloem. They provide metabolic support and energy to the sieve tube elements, as they possess a high density of mitochondria and other organelles. Companion cells also help regulate the movement of nutrients in the phloem and maintain the integrity of the sieve tube elements.

5. What is the significance of phloem elements in plant growth and development?

Ans. Phloem elements play a crucial role in plant growth and development. They facilitate the transport of organic nutrients from the sites of synthesis, such as leaves, to areas where they are needed for various metabolic processes, such as growth, storage, and reproduction. Without phloem elements, plants would not be able to efficiently distribute nutrients throughout their bodies, resulting in stunted growth and compromised functioning.

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