Companion cells in plants are associated with
Vessels
Sperms
Sieve elements
Guard cells
It’s obvious.
Lignin is the main constituent of
The first formed primary phloem is referred as …$A$… The later formed primary phloem is referred as …$B$…
Choose the correct combination of $A$ and $B$
Find set of cells connected by pit fields between their common longitudinal walls
Phloem in gymnosperms lacks
Describe importance of companion tissues.
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