Thorn is a stem structure because it - Vidyadip

MCQ

Thorn is a stem structure because it

A
Develops from trunk
✓
Develops from axillary bud
C
Grows from external surface
D
Is pointed

✓

Answer

Correct option: B.

Develops from axillary bud

b
(b)Thorns are actually modified axillary buds or terminal buds and they possess vascular supply.

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

Read carefully the following statements

$I.$ Funaria possesses unicellular and unbranched rhizoids

$II.$ Gemmae are asexual buds, which originate from small receptacles called gemma cups

$III.$ The Sphagnum plants have magnificent property of retaining water

$IV.$ Mosses along with lichens are the first organisms to colonise rocks

Which of the statements given above are correct?

Match List $I$ with List $II$ :

List $I$	List $II$
$A$. Oxidative decarboxylation	$I$. Citrate synthase
$B$. Glycolysis	$II$. Pyruvate dehydrogenase
$C$. Oxidative phosphorylation	$III$. Electron transport system
$D$. Tricarboxylic acid cycle	$IV$. $EMP$ pathway

Choose the correct answer from the options given below :

Choose correct statement for cytokine and mark correct option :
(i) It is a simple gaseous PGR.
(ii) It synthesised in large amounts by tissues undergoing senescence and ripening fruits.
(iii) Influences of it on plants include horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot seedlings.
(iv) It promotes senescence and abscission of plant organs especially of leaves and flowers.
(v) It synthesised in regions where rapid cell division occurs, for example, root apices, developing shoot buds, young fruits, etc.
(vi) It helps to produce new leaves, chloroplasts in leaves, lateral shoot growth and adventitious shoot formation.
(vii) It help overcome the apical dominance.
(viii) They promote nutrient mobilisation which helps in the delay of leaf senescence.

Heterophylly means

Substances which originate at the tip of stem and root and control the growth of different organs are

Green plants carry out 'photosynthesis', $a$ ...$1$.....process by which they use light energy to drive the synthesis of ...$2$... compound.

$1 - 2$

Restriction in Restriction endonuclease enzyme refers to

In respiration the energy is produced during the process of

Indole $-3$$ -$ acetic acid called as auxin was first isolated from

The sclerenchyma of the hypodermis in the Pinus needle helps in