Plant Growth and Development

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Auxins

IAA (Indole-3-acetic acid)

Auxins are plant hormones that regulate growth processes such as cell elongation, root initiation, and apical dominance.

Terms:

IAA

Indole-3-acetic acid, a natural auxin

Auxins are plant hormones that promote cell elongation, root initiation, and apical dominance. They are used in agriculture to promote rooting and control weed growth.

Common Use:

Used in agriculture for rooting and as herbicides.

Practice Related Questions

Growth Regulation

Plant Hormones

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Practice Questions

NEET Questions

1. Tracheids differ from the tracheary elements in

2. Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly-cut coleoptile stumps. Of what significance is this experiment?

3. Deficiency symptoms of nitrogen and potassium are visible first in

4. Which one of the following growth regulators is known as the stress hormone?

5. Typical growth curve in plants is

6. In a ring girdled plant

7. In ginger, vegetative propagation occurs through

8. Transpiration and root pressure cause water to rise in plants by

9. Minerals known to be required in large amounts for plant growth include

10.

The avena curvature is used for bioassay of

11.

In which of the following all three are macronutrients?

12.

Fruit and leaf drop at early stages can be prevented by the application of

13.

Which of the following is made up of dead cells?

14.

Plants having little or no secondary growth are

15.

Which of the following elements is responsible for maintaining turgor in cells?

16. Which of the statements given below is not true about the formation of annual rings in trees?

17. It takes a very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

18.

Which of the following is not an inhibitory substance governing seed dormancy?

19.

The process of growth is maximum during:

20.

Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

21.

Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called:

22. The plant hormone used to destroy weeds in a field is:

23. Match List - I with List - II.

24.

In the exponential growth equation $N_t = N_0 e^{rt},$ e represents:

25. The gaseous plant growth regulator is used in plants to:

26. Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants?

27.

$\newline$ Identify the correct set of statements: $\newline$ $\newline$ (a) The leaflets are modified into pointed hard thorns in Citrus and Bougainvillea. $\newline$ (b) Axillary buds form slender and spirally coiled tendrils in cucumber and pumpkin. $\newline$ (c) Stem is flattened and fleshy in Opuntia and modified to perform the function of leaves. $\newline$ (d) Rhizophora shows vertically upward growing roots that help to get oxygen for respiration. $\newline$ (e) Subaerially growing stems in grasses and strawberry help in vegetative propagation. $\newline$ $\newline$ Choose the correct answer from the options given below:

28.

In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form callus. This phenomenon may be called as:

29.

Spraying of which of the following phytohormones on juvenile conifers helps in hastening the maturity period, that leads to early seed production?

30.

Which hormone promotes internode/petiole elongation in deep water rice?

31.

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: $\newline$ Assertion A: Late wood has fewer xylary elements with narrow vessels. $\newline$ Reason R: Cambium is less active in winters. $\newline$ Choose the correct answer from the options given below:

32.

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: $\newline$ Assertion A: A flower is defined as a modified shoot wherein the shoot apical meristem changes to floral meristem. $\newline$ Reason R: Internode of the shoot gets condensed to produce different floral appendages laterally at successive nodes instead of leaves. $\newline$ Choose the correct answer from the options given below:

33. Formation of interfascicular cambium from fully developed parenchyma cells is an example for

34.

$\newline$ Given below are two statements: $\newline$ $\newline$ Statement I: Parenchyma is living but collenchyma is dead tissue. $\newline$ $\newline$ Statement II: Gymnosperms lack xylem vessels but presence of xylem vessels is the characteristic of angiosperms. $\newline$ $\newline$ In the light of the above statements, choose the correct answer from the options given below: