Download App

STD 11 - 13. Plant growth and development — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 13. Plant growth and development4 Marks
MCQ
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is
  • A
    elongating
  • B
    widening
  • ✓
    differentiating
  • D
    maturing.
✓

Answer

Correct option: C.
differentiating
c
(c) : The protoxylem differentiates in the parts of the primary body that have not completed their growth and differentiation. In fact in the shoot, the protoxylem matures among actively elongating tissues and is, therefore subjected to stresses. In the root, the protoxylem elements persist longer because here they mature beyond the region of maximum growth. In this differentiation annular and spiral thickening take place.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

NEET STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Synergid's filiform apparatus
→
The perianth is the term used when
→
Which of the following is pteridophytes belong to class-Pteropsida?
→
Which statement is wrong regarding geometrical growth ?
(i) On plotting the length of the organ against time, a linear curve is obtained.
(ii) Mathematically, it is expressed as $L_1=L_0+r t$.
(iii) Here, both the progeny cells following mitotic cell division retain the ability to divide and continue to do so.
(iv) If we plot the parameter of growth against time, we get a typical sigmoid or S-curve.
(v) A sigmoid curve is a characteristic of living organism growing in a natural environment.
(vi) It is typical for all cells, tissues and organs of a plant.
(vii) The growth can be expressed as $W _1- W _0 e ^{ n }$
→
$A -$ During formation of reproductive cells meiotic cell division occurs.

$R-$ During meiosis the genetic material is replicated twice and cell divides twice.

→
A single stranded $DNA $ molecule is the genetic material of bacteriophage
→
Basic structure of chromatin is composed of
→
Centromere is concerned with
→
$DNA$ molecule is translocated to which charge ?
→
The pollen grain represents
→