Q.Rearrange the following zones as seen in the root in vertical section and choose the correct option.
A. Root hair zone
B. Zone of meristems
C. Rootcap zone
D. Zone of maturation
E. Zone of elongation

A root shows four distinct regions in a fixed order as one moves from the tip upward. The root cap sits right at the apex, shielding the tender growing point as it pushes through the soil. Just above it lies the zone of meristematic activity, made of small, thin-walled, densely packed cells that divide repeatedly. These cells then enter the zone of elongation, where rapid enlargement drives the increase in root length. As elongated cells begin to differentiate, some epidermal cells put out fine, thread-like root hairs early in this stretch, giving the root hair zone, and further up the cells complete their differentiation in the zone of maturation.

• Order from tip to base: root cap, meristematic zone, elongation zone, root hair zone, zone of maturation
• This matches C, B, E, A, D

A vertical section of a root always displays the same four functional regions in the same order, because each region is a later stage in the life history of the same cells as they are pushed away from the apex.

• The root cap is the thimble-like structure right at the tip that protects the delicate growing point as the root forces its way through the soil.
• Immediately above it lies the zone of meristematic activity, where small, thin-walled cells with dense protoplasm divide repeatedly to keep supplying new cells.
• These cells pass into the zone of elongation, where rapid cell enlargement is chiefly responsible for the growth of the root in length.

• The root hair zone actively absorbs water and minerals through these hair-like outgrowths.
• Beyond this, the cells finish differentiating in the zone of maturation, where the tissues reach their mature, functional form.

Reading the regions from the tip therefore gives root cap, meristematic zone, elongation zone, root hair zone and zone of maturation, that is, C, B, E, A, D.

Method: Reason From "What Job Comes First?" Instead of Recalling the Sequence

For this kind of rearrange-the-zones MCQ, you do not need to have memorized the exact order beforehand, you can derive it by asking which job logically has to happen before which other job, then eliminate the wrong options.

Start from first principles: a root grows by pushing its tip through abrasive soil, so whatever protects that tip must be the outermost, first thing encountered, the root cap.

Next, ask where new cells come from to keep pushing the root forward. They must be produced just behind the cap, in a zone of active division, the meristematic zone.

Next, newly divided cells are small, so for the root to actually get longer, they must expand, meaning a zone of elongation must follow the meristem.

Next, once cells have elongated, the epidermis in that region begins sprouting fine absorptive hairs to draw in water, so the root hair zone comes right after elongation, not before, since hairs need already-elongated, maturing cells to grow from.

Finally, further back, the tissues finish specializing into their permanent form, giving the zone of maturation.

So the logical chain is protect, produce, lengthen, absorb, finish maturing, that is, root cap, meristem, elongation, root hair, maturation, which is exactly C, B, E, A, D.

Now use this derived sequence to test the options directly, rather than trying to recall which lettered option is correct. Only option (a), C-B-E-A-D, matches the logical order just derived, and the others scramble the sequence, for example option (b) starts with root hairs, which cannot come before elongation, and can be eliminated on sight.

This reasoning method is more reliable under exam pressure than pure recall, because it rebuilds the answer from cause and effect rather than memory alone.