differentiate between any one of the following pairs in one or two sentences for each: tracheid and vessel; sieve tube and companion cell
Answers
Explanation:
1)The cells of tracheids are imperforated while as the cells of vessels are perforated.
2)Sieve tubes are responsible for the transport of food throughout the plant body while as companion cells are responsible for regulating the activity of the sieve element.
Answer:
•What are Tracheids?
Tracheids are present in the xylem of angiosperms. They are conducting elements. They are also found in gymnosperms and ferns. Tracheid cells have pointed ends.
•What are Vessels?
Vessels are present only in angiosperms. They help in conducting water and minerals in the plants. After secondary cell wall thickening and lignification, dead and tubular cells are formed. These vessels do not contain protoplasm on maturity.
•What are Sieve Tubes?
Sieve tubes are the sieve elements present in angiosperms. They are elongated large cells that have pores in their transverse walls. Moreover, at the young stage, sieve tubes have a nucleus. But with maturity, the nucleus disappears from the sieve tube cells. They have a few number of mitochondria. However, they lack ribosomes, unlike companion cells.
•What are Companion Cells?
Companion cells are elongated cells associated with sieve tube elements of angiosperms. These cells have a lot of mitochondria and ribosomes. Furthermore, they have a nucleus throughout their life time. Hence, these companion cells are metabolically highly active. However, these cells are small cells compared to sieve tubes.
Explanation:
Hope the answer is helpful pls mark me brainliest