Plant Growth Regulators

Q. Plant growth regulators are involved in

1. Cell division and cell enlargement

2. Pattern formation and tropic growth

3. Flowering, fruiting and seed formation

4. All of these

Q.

Match the following columns.
$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \text{A}& \text{Zeatin}& 1& \text{Flowering hormone}\\ \text{B}& \text{Florigen}& 2& \text{Synthetic auxin}\\ \text{C}& \text{IAA}& 3& \text{Cytokinin}\\ \text{D}& \text{NAA}& 4& \text{Natural auxin}\end{array}$

1. A-4, B-1, C-2, D-3

2. A-3, B-1, C-4, D-2

3. A-3, B-4, C-1, D-2

4. A-2, B-1, C-4, D-3

Q.

Pick out the correct statements.
I. Cytokinins especially help in delaying senescence.
II. Auxins are involved in regulating apical dominance.
III. Ethylene is especially useful in enhancing seed germination.
IV. Gibberellins are responsible for immature falling of leaves.

1. I and III

2. I and II

3. II and IV

4. I and IV

Q.

Plant hormones are

1. Growth inhibitors

2. Growth regulators

3. Growth promoters

4. All of these

Q.

Match the following columns
$\begin{array}{cccc}& ColumnI& & ColumnII\\ A.& Humanurine& 1.& Cytokinin\\ B.& Gibberellafujikuroi& 2.& Auxin\\ C.& HerringfishDNA& 3.& Ethylene\\ D.& Ripeningoffruits& 4.& Abscisicacid\\ E.& Agedleavesofplants& 5.& Gibberellins\end{array}$

1. (A)→(2), (B)→(5), (C)→(1), (D)→(3), (E)→(4)

2. (A)→(2), (B)→(3), (C)→(4), (D)→(5), (E)→(1)

3. (A)→(1), (B)→(5), (C)→(2), (D)→(4), (E)→(3)

4. (A)→(3), (B)→(2), (C)→(1), (D)→(5), (E)→(4)

5. (A)→(5), (B)→(4), (C)→(3), (D)→(2), (E)→(1)

Q.

Which of the following is a CORRECT statement?

1. Robert Hooke isolated auxins

2. Zeatin is isolated from corn kernels

3. GA's discovered first in plants

4. Ethylene is strictly a plant growth inhinitor

Q.

One hormone hastens maturity period in juvenile conifers, second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses. They are respectively

1. Gibberellin, Auxin, ABA

2. Gibberellin, Auxin, Ethylene

3. Auxin, Gibberellin, Cytokinin

4. Auxin, Gibberellin, ABA.

Q. Which of the following is NOT an auxin?

1. IAA
2. IBA
3. Zeatin
4. NAA

Q. Which of the following is/are true for plant growth regulators?

1. Plant growth regulators are also known as phytohormones.
2. The regulators are signal molecules produced within the cell.
3. They occur in extremely low concentrations.
4. Phytohormones are required in high concentrations.

Q. Select the functions of plant hormones or phytohormones:

1. Flowering
2. Shedding
   leaves
3. Fruiting
4. Seed
   formation
5. Cell
   division
6. Tropic
   growth
7. Flower colour
8. Cell
   elongation