9th Class Science: The Fundamental Unit of Life

Question: Name the organelles present in liver of animals for detoxifying many poisons and drugs.

Answer: In the liver of animal cells smooth endoplasmic reticulum helps in detoxifying many poisons and drugs.

Question: What is the energy currency of the cell?

Answer: ATP—Adenosine Triphosphate.

Question: What is the function of ribosome?

Answer: Ribosomes help in protein synthesis.

Question: Where are genes located in the cell?

Answer: Genes are located in the chromosomes in the nucleus of the cell.

Question: Name the cell organelles that helps in packaging?

Answer: Golgi apparatus.

Question: Name the cell organelle which helps in the transportation of material.

Answer: Endoplasmic reticulum.

Question: Name the cell organelle due to which leaves, flowers and fruits get their colour.

Answer: Chromoplast.

Question: Name the cell organelle which helps in the formation of lysosome.

Answer: Golgi apparatus.

Question: Name the cleansing organelle in the cell.

Answer: Lysosomes.

Question: Name two cells with cell wall.

Answer: Onion cell (plant cell) and fungi.

Question: Why does mitochondria have largely folded inner membrane?

Answer: Mitochondria is the site for cellular respiration and provides energy to the cell. The largely folded inner membrane provides the increased surface area for ATP-generating chemical reactions.

Question: Which organelle makes the digestive enzyme of lysosome?

Answer: Rough endoplasmic reticulum makes the digestive enzyme of lysosomes.

Question: What are cisterns?

Answer: The Golgi bodies consist Of a system of membrane-bound vesicles arranged in stacks called cisterns.

Question: State two conditions required for osmosis.

Answer:

1. The difference in the concentration of water, one should have higher concentration than the other.
2. Semi-permeable membrane is also required through which water will flow.

Question; What is plasmolysis?

Answer: When a living plant cell loses water through osmosis there is shrinkage or contraction of the contents of the cell away from the cell wall. This phenomenon is known as plasmolysis.