Plant hormones are chemical plants use for communication, coordination, and development between their many cells.
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Davinia.
Answer: hydrogen bonding among water molecules
Explanation:
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Option B.
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- <u>Phototropism</u> is the process in which plant grow in response to light. Where "Photo'' means light and ''Tropisms'' are responses to external stimuli in this case stimuli against light.
Now, going back to the question
- Plant cells grows faster in the presence of the hormone auxin.
- As a result when a plant senses a light from a direction, auxin molecules accumulates to the side that is further away from the light, due to which the plant cells that are further away from the light experience a greater auxin concentration and grow faster, due to which shoot gets bend towards the direction of the applied light.
- <u>Gravitropism</u> is a process of growth by a plant in response to gravity pulling on it. Roots show positive gravitropism i.e they will grow with the gravitational pull and stems show negative gravitropism that is they will grow against gravitational pull.
- Auxin is a plant hormone which promotes stem elongation and inhibits the growth of lateral buds.
- Auxin helps in maintaining apical dominance, which means in presence of auxin the plant will grow Vertically upward i.e against the gravity. Hence Auxin promotes gravitropism.
Result: Phototropism and Gravitropism is controlled by Hormones
1) cells are the smallest units of life
2) living organisms are made up of cells
3) all cells come from existing cells
A carbon footprint deals with the resource usage but focuses strictly on the greenhouse gases released due to burning of fossil fuels. Greenhouse gas calculation make up a portion of an ecological footprint. An ecological footprint compares the total resources people consume with the land and water area that is needed to replace those resources, it measures the demand human populations put on nature. Both calculations illustrate the impact of human activity on the environment.