Identify the xylem element. A) Trachieds B) Sieve cells C) Sieve tubes D) Companion cells

C) Cell theory

A) Dermal layer

C) Both xylem and phloem

C) Sieve cells

Correct option is D) Lignin

Correct option is C) Phloem

Companion cells:  a. These are narrow elongated and living.  b. Companion cells are laterally associated with sieve tube elements.  c. Companion cells have dense cytoplasm and prominent nucleus.  d. Nucleus of companion cell regulates...

(A) Plasmodesmata

i. F: It is most electronegative. It shows only a negative oxidation state of -1. ii. Cs: Alkali metals have only one electron in their valence shell and hence, exhibits only positive...