NTA Abhyas NEET2020BotanyAnatomy of Flowering PlantsPractice
Which is/are correct statement/s?
Options
- AIn flowering plants, tracheids and vessels are the main water transporting elements.
- BIn gymnosperms, tracheids are the chief water transporting elements
- CThe companion cells play an important role in the maintenance of a pressure gradient in the sieve tubes
- DAll of these
Correct answer
D. All of these
Step-by-step solution
Gymnosperms lack vessels in their xylem. Tracheids are elongated or tube-like cells with thick and lignified walls and tapering ends. These are dead and are without protoplasm. The inner layers of the cell walls have thickenings which vary in form. In flowering plants, tracheids and vessels are the main water transporting elements. The vessel is a long cylindrical tube-like structure made up of many cells called vessel members, each with lignified walls and a large central cavity. Companion cells, along with phloem