Question

Match the items given in column A with most appropriate one in column B. Rewrite the correct matching pairs.

Column 1	Column 2
Parthenocarpy	Stimulus of contact
Apical dominance	2: 4- D
Weedicides	Formation of fruit without fertilisation
Thigmotropism	Growth temporarily stopped
Dormancy	Auxin

Answer 1

1. Parthenocarpy III. Formation of fruit without fertilization

• Parthenocarpy leads to the formation of seedless fruits without fertilization of the ovule and the pollen grain.
• If the unpollinated flowers are sprayed with IAA (Indole acetic acid) and IBB (Indole butyric acid), it leads to parthenocarpy.

2. Apical dominance V. Auxin

• The presence of IAA in high concentration leads to apical dominance.
• The apical bud does not allow the sprouting of the nearby buds in apical dominance.

3. Weedicides II 2:4-D

• 2:4-D is a synthetic auxin that is used to destroy unwanted plants or weeds.

4. Thigmotrophism I. Stimulus of contact

• Thigmotrophism is seen in tendrils and twiners where the region which is not in contact with the support grows and makes the tendrils curve over the support.

5. Dormancy IV. Growth temporarily stopped

• Under stressful conditions, the growth of buds and seeds are temporarily stopped due to dormancy.

Abscisic acid induces dormancy

Hence, the proper matching of the columns is as follows:

	Column A		Column B
1.	Parthenocarpy	c.	Formation of fruit without fertilization
2.	Apical dominance	e.	Auxin
3.	Weedicides	b.	2:4- D
4.	Thigmotropism	a.	Stimulus of contact
5.	Dormancy	d.	Growth temporarily stopped