Tag: plant hormones

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

Cytokinin and ethylene have oppsite effect on:-

  1. Leaf senescence

  2. Elogation of stem

  3. Lateral swelling of stem

  4. Winter dormancy
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

Kinetin was first isolated and identified by

  1. Charles Darwin

  2. Boysen and Jansen

  3. Paal

  4. Miller
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

The chief role of CK is 

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Which of the following contains cytokinin?

  1. Coconut milk

  2. Young kernels of maize

  3. Fruit of cucurbits

  4. Both (A) and (B)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Coconut milk and young kernels of maize contains cytokinin. Cytokinis are a class of plant growth substances that promote cell division, or cytokinesis in plant roots and shoots. It is an adenine derivative.

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

Which one of the following is not true about kinetin?

  1. It promotes bud growth.

  2. It defers senescence.

  3. It helps in retention of chlorophyll.

  4. It inhibits the cell division.
Reveal answer Fill a bubble to check yourself
D Correct answer
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 a compound from autoclaved herring sperm DNA that had cell division-promoting activity.

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

Kinetin was isolated by ...............

  1. Skoog and Miller

  2. Darwin and Lamarck

  3. Boysen and Jensen

  4. Went and Smit
Reveal answer Fill a bubble to check yourself
A Correct answer
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 a compound from autoclaved herring sperm DNA that had cell division-promoting activity. It was given the name kinetin because of its ability to induce cell division, provided that auxin was present in the medium. Kinetin is often used in plant tissue culture for inducing formation of callus and ti regenerate shoot tissues from callus.

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

Which of the following is not properly matched?

  1. Explant - excised plant part used for callus formation

  2. Cytokinins - root initiation in callus

  3. Somatic embryo - embryo produced from a vegetative cell

  4. Anther culture - haploid plants

  5. Callus - undifferentiated mass of cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plant cells are totipotent means, each cell retains total potential to generate a new plant. Callus is an undifferentiated mass of cell generated in plant tissue culture from meristematic cells from which entire plant can be regenerated. The small piece of meristematic tissue which is used in tissue culture to generate callus is called an explant. The ratio between auxin and cytokinin is an important factor deciding initiation of roots and shoots. Phytohormone cytokinin promotes growth of shoot whereas auxin promotes growth of roots. Anther culture is done for production of haploids because anthers contain haploid microspores which can be used to generate new plants. Somatic embryos are produced by direct fusion of somatic cells one with nucleus and another without nucleus.