MCQ
Function of companion cells is:
- ALoading of sucrose into sieve elements.
- BProviding energy to sieve elements for active transport.
- CProviding water to phloem.
- DLoading of sucrose into sieve elements by passive transport.
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$(i)$ Cilium / Flagellum contains an outer ring of nine doublet microtubules surrounding two singlet microtubules.
$(ii)$ Cilia are smaller which work like oars, causing the movement of either the cells or surrounding fluid.
$(iii)$ Flagella are comparatively longer and responsible for cell movement.
$(iv)$ Cilium and flagellum are covered with plasma membrane. Which of the above statements are correct?
What does $A$ and $B$ refer here?