Chemical coordination in plants Biology - Chemical coordination in plants

(i) _____________ are positively thigmotropic because they grow towards the support in response to contact. (ii) _____________ inhibits the effect of other hormones. (iii)_____________ Response to stimuli is a characteristic feature of all living organisms. (iv) _____________ synthesize auxins from the amino acid Tryptophan. (v) _____________ is the directional growth movement of the plant part in response to a chemical stimulus.

Stems show _____________ phototropism, while roots show _____________ phototropism.

Abscisic acid is formed from _____________ .

Abscisic acid was discovered by _____________ .

_____________ is most widely used for the artificial ripening of fruits.

The figure given below show the stages of ripening in a banana. Answer the question that follow:
Name the plant hormone responsible for the above changes.

The tea plants are never allowed to grow lengthwise. This is done by cutting their apical buds, a process known as pruning. In this way, tea plants get a dense growth and easy yield. Answer the following question :
Name one plant hormone which inhibits the said phenomenon.

The tea plants are never allowed to grow lengthwise. This is done by cutting their apical buds, a process known as pruning. In this way, tea plants get a dense growth and easy yield. Answer the following question :
What plant hormone is responsible for the scientific phenomenon mentioned in 1.1.

The tea plants are never allowed to grow lengthwise. This is done by cutting their apical buds, a process known as pruning. In this way, tea plants get a dense growth and easy yield. Answer the following question :
Name the scientific phenomenon that is being overcome by pruning.

Name the following.
Main auxin found in most plants.

The figure given below shows the stages of ripening in a banana. Answer the question that follow:
Mention two characteristic features of this hormone.

Differentiate between:
Phototropism and chemotropism

Name the stimulus which causes the following movements in plants.
phototropism,thigmotropism, hydrotropism and geotropism

Differentiate between:
Thigmotropism and geotropism

Match the items in column A with those of column B.

Column A	Column B
(a) Auxin	(i) apical dominance
(b) Gibberellin	(ii) cell division
(c) Cytokinin	(iii) fruit ripening
(d) Ethylene	(iv) internodal elongation

What is meant by positive and negative tropic movements in plants? Explain them by giving suitable examples.

How is movement in plants different from that in animals?

With the help of an experiment, prove that roots are more positively hydrotropic than geotropic.

The response of plants to gravity is known as geotropism. How are plant parts sensitive to gravity? Describe with the help of a diagram.

List five plant growth hormones and briefly describe their roles.

What are tropic movements? Briefly explain various types of tropic movements in plants.

Ethylene promotes the growth of the lateral buds.

Cytokinins promote cell division only in meristematic cells.

Gibberellins play no role in overcoming dormancy.

The presence of high concentration of auxins promotes root growth.

Auxin promotes cell division.

Choose the Odd One Out :
(i) Ethylene, Cytokinins, Phototropism, Gibberellins, Auxins
(ii) Geotropism, Abscisic Acid, Hydrotropism, Thigmotropism, Chemotropism
(iii) Seed Dormancy Breaking (Gibberellins), Leaf Abscission (Ethylene), Root Elongation (Cytokinins), Phototropism, Apical Dominance (Auxins)
(iv) Fruit Ripening (Ethylene), Flower Induction (Gibberellins), Cell Division (Cytokinins), Hydrotropism, Stomatal Closure (Abscisic Acid)
(v) Drought Resistance (Abscisic Acid), Cell Elongation (Auxins), Seed Dormancy (Abscisic Acid), Chemotropism, Stem Elongation (Gibberellins)

Choose the Odd One Out :
Auxin, Oxytocin, Gibberellin, Cytokinin

Choose the Odd One Out :
Thigmotropism, Albinism, Chemotropism, Geotropism.

Choose the Odd One Out :
Auxin, Cytokinin, Thyroxine, Abscisic acid.

Choose the Odd One Out :
2,4-D, 2,4,5-T, NAA, Gibberellic acid.