Pith cells are found in

Distinguish between the following: Protoxylem and metaxylem.

Which of the following shows physiological xerophytic characters?

Draw illustrations to highlight the anatomical differences between:
$(a)$ Monocot root and dicot root
$(b)$ Monocot stem and dicot stem

Distinguish between the following: Stele and vascular bundle.

Read the following four statements $(A-D)$:
$(A)$ Both photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane.
$(B)$ In dicot stems,a new cambium originates from cells of pericycle at the time of secondary growth.
$(C)$ Stamens in flowers of Gloriosa and Petunia are polyandrous.
$(D)$ Symbiotic nitrogen fixers occur in free-living state also in soil.
How many of the above statements are right?