Solve Q 2-5
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Answer 2-
Movements:
Plant cells show two types of movements-Tropic movements and Nastic movements.
1.Tropic movements are growth movements in response to an environment stimulus. This type of movement may occur in reponse to gravity (gravitropism), light (phototropism), chemical (chemotropism), water (hydrotropism) etc.
2.Nastic movements are independent of the direction of stimulus. This type of movement may occur in response to chemicals (chemonasty), temperature (thermonasty), touch (thigmonasty) etc.
So we can conclude that plant cells do not possess muscle cells still they show movements in response to different stimuli.
Stimuli:
The biotic components of the environment are as follows:
1. Plants: Most plants have green leaves. Green plants make their own food using carbon dioxide and water in the presence of light and chlorophyll. This process is called photosynthesis.
2. Animals: Animals cannot make their own food, so they are called heterotrophs. Animals obtain their nutrients by eating plants or the flesh of other animals.
3. Scavengers and decomposers: Animals that feed on the dead bodies of other animals are called scavengers. Example: Hyena and vulture. Tiny organisms that feed on the remains of dead plants and animals to break them down into simpler substances are called decomposers. Example: Bacteria and fungi.
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Answer 2-
Movements:
Plant cells show two types of movements-Tropic movements and Nastic movements.
1.Tropic movements are growth movements in response to an environment stimulus. This type of movement may occur in reponse to gravity (gravitropism), light (phototropism), chemical (chemotropism), water (hydrotropism) etc.
2.Nastic movements are independent of the direction of stimulus. This type of movement may occur in response to chemicals (chemonasty), temperature (thermonasty), touch (thigmonasty) etc.
So we can conclude that plant cells do not possess muscle cells still they show movements in response to different stimuli.
Stimuli:
1. Plants respond to different types of external stimulus in different ways.
Some plants like "touch-me-not" respond to touch (thigmotropism) by showing movement using electrical-chemical means to convey the information from cell to cell.
Plants respond to other stimuli like water, light, gravity etc. by growing towards or away from the stimulus.
2. There are various plant hormones like auxins, gibberellin, cytokinin, abscisic acid, ethylene etc.
- Auxins and gibberellins help in the growth of the stem.
- Cytokinins promote cell division.
- Abscisic acid inhibits growth and cause wilting of leaves.
- Ethylene helps in ripening of fruits.
The biotic components of the environment are as follows:
1. Plants: Most plants have green leaves. Green plants make their own food using carbon dioxide and water in the presence of light and chlorophyll. This process is called photosynthesis.
2. Animals: Animals cannot make their own food, so they are called heterotrophs. Animals obtain their nutrients by eating plants or the flesh of other animals.
3. Scavengers and decomposers: Animals that feed on the dead bodies of other animals are called scavengers. Example: Hyena and vulture. Tiny organisms that feed on the remains of dead plants and animals to break them down into simpler substances are called decomposers. Example: Bacteria and fungi.
For rest of the solutions we request you to ask different questions in different threads, so that our experts can help you in a better way.
Keep asking!!
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