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Poll

Which cell does not have perforated cell wall?

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Poll Results

33.33%(a) tracheids ( 2 voters )
66.67%(b) companion cells ( 4 voters )
0%(c) sieve tubes
0%(d) vessels
Based On 6 Votes

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NCERT Important Questions Class 9 Science biology Chapter 6
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Chapter 6 Tissues
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2 Answers

  1. [B] Companion cells
    Tracheids and vessels are the xylem elements and are related to the transport of water. They are long tube-like structures with partially or completely breached walls to form water pipes (in vehicles) and pits in the cell wall (in tracheids) to conduct water. Sieve tubes are thin tube-like structures whose end walls are perforated with many holes and are called sieve plates. They are phloem elements and are the main food carrier elements. Associate cells contain many mitochondria and ribosomes and are the supporting units of sieve tubes.

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