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Answer:
Explanation:
1) There are 5 stimuli in the environment. They are light, gravity, chemical, water and touch. These stimuli give five types of tropism. They are phototropism, geotropism, chemotropism, hydrotropism and thigmotropism.
2) The turning of all or part of an organism in a particular direction in response to an external stimulus.
3) The mentioned article will highligth the six types of trophic movementsin plants.
the six types are :
i) Thigmotropism Haptotropism.
ii) Phototropism.
iii) Geotropism.
iv) Thermotropism.
v) Chemotropism.
vi) Hydrotropism.
4) One important light response in plants is phototropism, which involves growth towrds or away from a light source. Positive Phototropism is growth towards a light souce; negative phototropism is growth away from the light.
5) Take a pea seeding in a empty jar filled with sand. Now place a porous pet filkled with water in the white jar. Roots of the plant will green towards water and bond towards the water source showing hydrotropism.
6) Plant hormones or photohormone are signal molecules, produced within plants, that occur extremelylow concentrations. Plant hormones controll all aspects of plant growth and development, from embroygenesis, the regulation of organ size, pathogen defense, strss tolerence and through reproductive development.
7) Sensitive plant, Mimosa pudica, also called humble plant, plant in the pea family Fabaceae that responds to touch and other stimulation by rapidly closing its leaves and dropping.
8) Plant hormones are organic substances that reulate plant growth and development. Plants produce a wide variety of hormones, including auxins, gibberllins, abscisic acid, cytokinins, salicylic acid, ethylene, jasmonates, brassinosteroids (BR), and peptides.
9) Auxins promote stem elongation, inhibit growth of lateral buds maintains apical domiance, They are produced in the stem, buds, and root tips. This produces a curving of the plant stem tip toward the light, a plant movement known as phototropism. Auxin also plays a role in maintaining apical domiance.