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Ask QuestionPosted by Syed Ahamad 4 years, 4 months ago
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Kumar Shivam 4 years, 4 months ago
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Yogita Ingle 4 years, 5 months ago
Auxins
- IAA and indole butyric acid (IBA) have been isolated from plants and NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic) are synthetic auxins.
- They help to initiate rooting in stem cuttings, promote flowering, prevent fruit and leaf drop at early stages, induce parthenocarpy (example- tomato).
- In most higher plants, the growing apical bud inhibits the growth of the lateral (axillary) buds, a phenomenon called apical dominance.
- Auxins are widely used as herbicides.
Example- 2, 4-D is widely used to kill dicotyledonous weeds.
Gibberellins
- Gibberellins are denoted as GA1, GA2, GA3.
- All gibberellins are acidic.
- They help to increase in length of axis, elongate and improve shape of fruits, delay senescence,
- Spraying juvenile conifers with GAs hastens the maturity period, thus leading to early seed production.
- Gibberellins also promotes bolting, defined as internode elongation just prior to flowering, in beet, cabbages.
Cytokinins
- Cytokinins were discovered as kinetin from the autoclaved herring sperm DNA.
- Natural cytokinins are synthesised in regions where rapid cell division occurs, for example, root apices.
Posted by Ramandeep Kaur 4 years, 5 months ago
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Yogita Ingle 4 years, 6 months ago
The presence or absence of pigments is the main basis of classification of algae.
Chlorophyceae: Chlorophyll a and b are present in them and impart green colour. Chlorophyceae are also called ‘blue-green algae’.
Phaeophyceae: Chlorophyll a and c and fuxoxanthin are present. Fucoxanthin imparts brown colour. Phaeophyceae are also called ‘brown algae’.
Rhodophyceae: Chlorophyll a and d and phycoerythrin are present. Phycoerythrin imparts red colour. Rhodophyceae are also called ‘red algae’.
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Ramandeep Kaur 4 years, 5 months ago
Yogita Ingle 4 years, 8 months ago
Two Kingdom Classification
(Carolus Linneaus):
- Animal Kingdom
- Plant Kingdom
Five Kingdom Classification
(Robert H. Whittaker 1969):
This is the most accepted system of classification. The five kingdoms are as follows:
- Monera
- Protista
- Fungi
- Plantae and
- Animalia
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Shreyashi Singh 3 years, 10 months ago
1Thank You