diffreantiate between
Answers
A) Nucleus- 1. Large in size
2. Bound by the nuclear envelope
3. It contains chromosomes.
4. It is rich in DNA, the genetic m material.
Nucleolus - 1. Very small in size
2. It has no limiting membrane
3. It does not hold any chromosomes
4. It is rich in RNA
D) Inspiration- 1. It is an active process.
2. Contraction of external intercostals muscles and relaxations and internal intercostals muscles occur.
3. Rib cages move forward and outward.
4. Diaphragm contracts and becomes flattened.
5. Increase in volume of thoracic cavity.
6. Air pressure in lungs is less than atmospheric pressure.
Expiration- 1. It is an passive process.
2. Relaxations of external intercostals muscles and Contraction of internal intercostals muscles occur.
3. Rib cages move downward and inward.
4. Diaphragm relaxes and becomes original dome shaped.
5. Decrease in volume of thoracic cavity.
6. Air pressure in lungs is higher than atmospheric pressure.
E) Animal cells
Animals are made up of millions of cells. Animal cells have an irregular structure and are made up of four key parts:
Nucleus – This contains genetic material (DNA), and controls the cell's activity.
Cell membrane – A flexible layer that surrounds the cell and controls the substances that enter and exit.
Cytoplasm – A jelly-like substance where the chemical reactions happen.
Mitochondria – This is where energy is released from the food molecules.
Plant cells
Plants are also made up of millions of cells. Plant cells have a nucleus, cell membrane, cytoplasm and mitochondria too, but they also contain the following structures:
Cell wall – A hard layer outside the cell membrane, containing cellulose to provide strength to the plant.
Vacuole – A space inside the cell that is used to store substances and help the cell keep its shape.
Chloroplasts – Structures that contain the green pigment chlorophyll, which are a key part of photosynthesis.
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