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?

The process of extraction of separated $DNA$ strands from gel is called elution.
$(a)$ In roots,xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii.
$(b)$ Conjoint closed vascular bundles do not possess cambium.
$(c)$ In open vascular bundles,cambium is present in between xylem and phloem.
$(d)$ The vascular bundles of dicotyledonous stem possess endarch protoxylem.
$(e)$ In monocotyledonous root,usually there are more than six xylem bundles present.
Choose the correct answer from the options given below:

Presence of vessels in the wood is:

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

$T.S.$ of a dicot leaf is given below. Certain parts have been indicated by alphabets. Choose the correct option.

How is the study of plant anatomy useful to us?