Tag: chemical coordination in plants

Questions Related to chemical coordination in plants

High concentration of hormone will

biology life processes: control and coordination control and coordination in plants growth in plants chemical coordination in plants animal senses sense organs in animals sense organs in humans

  1. Kill the plant

  2. Cause chlorosis in leaves

  3. Cause stunting in plants

  4. Show no effect on the plant

Show answer
Correct Option: C
Explanation:

When concentration of hormones in the plant body increases, growth of the plants decreases.

So, the correct option is cause stunting in plants’.

State whether the following statements are true or false.
A hormone is produced in small amounts in a tissue, and it causes a physiological action within that same tissue soon after its production.

biology life processes: control and coordination control and coordination in plants growth in plants chemical coordination in plants animal senses sense organs in animals sense organs in humans

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

A hormone is not produced in tissue but instead in an organ. The effect caused by that by that hormone can be seen in various parts of the body including the site of production. For example, insulin produced by pancreas converts the glucose present in the bloodstream into the glycogen.  

So, the correct option is 'False'.

Identify the physiological process induced by two phytohormones having a common precursor which is formed due to catalytic activity of pyruvic dehydrogenase complex
(a) More female flowers in Cucumber
(b) $\alpha$-amylase production in Barley grains
(c) Acceleration of fruit ripening in Tomato
(d) Delay in sprouting of Potato tubers.

biology life processes: control and coordination control and coordination in plants growth in plants chemical coordination in plants animal senses sense organs in animals sense organs in humans

  1. a, b

  2. a, c

  3. c, d

  4. b, d

Show answer
Correct Option: C
Explanation:

Ethylene is a plant hormone. It accelerates fruit ripening in tomato. Maleic hydrazide is a type of auxin, plant hormone. It delays sprouting of potato tubers. Both these hormones have common precursor that is formed due to the catalytic activity of pyruvic dehydrogenase complex.

Thus, the correct answer is option C.

Delaying aging of leaves and opening of stomata are due to the action of _______

biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

  1. Auxins 

  2. Gibberellins

  3. Cytokinins

  4. Abscisic acid

Show answer
Correct Option: C
Explanation:
A. Auxins are the plant hormones which promote cell enlargement and cell differentiation. It also promote fruit growth. It is responsible for phototropic and geotropic responses of plants.
B. Gibberellins are plant hormones which promote cell enlargement and cell differentiation in the presence of auxins. It help in breaking the dormancy in seeds and buds. It also promote fruit growth. It stimulates elongation of shoots of various plants.
C. Cytokinins are plant hormones which promote cell division in plants. It also helps in breaking the dormancy in seeds and buds. The delay the ageing of leaves. It promotes opening of stomata.
D. Abscisic acid (ABA) is a  plant hormone which functions mainly as a growth inhibitor. It promotes the dormancy in seeds and buds [ this is the opposite of breaking the dormancy. It also promotes closing of stomata. It promotes falling of leaves. 
So, the correct answer is 'Cytokinins'.

Cytokinins are known to

biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

  1. Inhibit cytoplasmic movement.

  2. Help in retention of chlorophyll.

  3. Influence water movement.

  4. Promote abscission layer formation.

Show answer
Correct Option: B
Explanation:

Cytokinins perform several other functions:
- Stimulates cell division.
- Stimulates morphogenesis in tissue culture.
- Stimulates the growth of lateral buds.
- Stimulates leaf expansion.
- Enhance stomatal opening

Cytokinin and ethylene have oppsite effect on:-

biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

  1. Leaf senescence

  2. Elogation of stem

  3. Lateral swelling of stem

  4. Winter dormancy

Show answer
Correct Option: A
Explanation:

Cytokinins are the plant hormones that are responsible for cell division and elongation, their help in the delay of leaf senescence as they transport nutrients to these parts. Ethylene is a gaseous hormone and is responsible for transverse growth as swelling of the stem, It hastens the senescence of leaves due to the evolution of ethylene gas.

So, the correct option is 'Leaf senescence'.

Find the correct application of cytokinin.

biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

  1. Acts as anti-transparent and induces closure of stomata

  2. To promote root development on various types of cuttings

  3. In tea plantation for giving bushy appearance

  4. Promotes parthenocarpy in fruits like banana and grapes

Show answer
Correct Option: A

Kinetin was first isolated and identified by

biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

  1. Charles Darwin

  2. Boysen and Jansen

  3. Paal

  4. Miller

Show answer
Correct Option: D
Explanation:

Kinetin is a type of cytokinin, a class of plant hormone that promotes cell division. Kinetin was originally isolated by Miller and Skoog et al., as compound from autoclaved herring sperm DNA that had cell division-promoting activity.

The chief role of CK is 

biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

  1. To check abscission

  2. To check senescence

  3. To mobilize solutes

  4. To check senescence and to mobilize solutes from one part to other

Show answer
Correct Option: D
Explanation:

Cytokinin hormone does the major function of checking senescence and mobilising solutes from one part to another. It promotes the cell division or cytokinesis, in plant roots and shoots.

So, the correct answer is option D.

Phytocytomine is a

biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

  1. Kinetin

  2. Giberellin

  3. Auxin

  4. None of the above

Show answer
Correct Option: A
Explanation:

Phytocytomine is a plant growth regulator. It is a kind of kinetin. It is synthesized from Licheniformis bacillus.