Answer:
a spider has 4 pairs of legs, since they have 8 legs
Answer:
Lysosomes are the membrane-bound organelles present in the cytoplasm of eukaryotic cells.
They are called the suicidal bags of the cell.
They contain numerous hydrolytic enzymes which are used to digest complex biomolecule into their simpler units.
Lysosomes can fuse with each to form larger vesicle in order to digest very large compounds or cellular debris.
They play an important role in autophagy and help in recycling the materials in the cell.
They do so by digesting the debris (unwanted or damaged part) and returning the simpler constituents back to the cell. These substances are then reused as the building blocks for new components of the cell.
The plant cell has a cell wall, chloroplasts, plastids, and a central vacuole—structures not found in animal cells. Plant cells do not have lysosomes or centrosomes.
B. <span>A different kind of RNA decodes the information and assembles the building blocks of the protein.</span>
The food chain and food web are used to transfer energy. Plants, who are the primary energy providers in the ecosystem, use their chloroplasts to collect sunlight, which is then partially converted into chemical energy during photosynthesis.
a)
- When herbivores eat (are the primary consumers of) plants as food, this energy is transferred to the primary consumers in the food chain.
- This energy is stored in various organic products in plants. Then, the chemical energy contained in plant products is converted into kinetic energy, degrading the energy by turning it into heat. The secondary consumers come next.
- Further deterioration will occur when these herbivores are consumed by secondary consumers.
- Finally, energy will once more be destroyed when tertiary consumers eat the carnivores. As a result, the energy flow is only in one direction i.e., unidirectional.
b)
- Additionally, the energy flow in a food chain adheres to the 10% law.
- This law states that only 10% of energy is transferred from one trophic level to the next, with the remaining 90% being lost during the digestion process of the organism itself.
c)
- There are typically fewer organisms at the top of an energy pyramid because It has the least quantity of energy, the top level of an energy pyramid has the fewest organisms.
- Most ecosystems only have four trophic levels because there is eventually insufficient energy to maintain further trophic levels.
d)
- For instance, let us assume that a plant at the producer level produces 1000 Kcal of energy.
- When a primary producer eats this plant, it will only get 10% of the energy produced by the plant i.e., 1000/10 = 100 Kcal. the rest 90% will be used up by the plant itself for its metabolism.
- Further when a secondary consumer eats the primary consumer, it will only get 10% of the energy produced by the plant i.e., 100/10 = 10 Kcal.
- Lastly, as the tertiary consumer eats the secondary consumer, it will only get 10/10 = 1kcal.
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