Name two double membraned cell organelles.
Q.1. Name two double membraned cell organelles.
Ans. Chloroplast and Mitochondria.
Q.2. Name the cell organelles which are without a membrane.
Ans. Ribosomes.
Q.3. Name the single membrane-bound cell organelle which is found in an animal cell.
Ans. Lysosome.
Q.4. What is the role of smooth endoplasmic reticulum in the liver cells of vertebrate animals?
Ans. SER in vertebrate animals plays a crucial role in detoxifying many poisons and drugs.
Q.5. Which type of animal cell lacks both mitochondria and endoplasmic reticulum ?
Ans. RBCs (Red Blood Cells) of mammals.
Q.6. What is endocytosis?
Ans. It is the process of ingestion of material by the cells through the plasma membrane.
Q.7. What is osmosis?
Ans. The movement of water molecules from a region of high concentration, to a region of low concentration across a selectively permeable membrane is called osmosis.
Q.8. Do you agree that “A cell is a building unit of an organism”. If yes, explain why.
Ans. Yes, a cell is a building unit of an organism because it is responsible for building the entire body of an organism.
Q.9. Why mitochondria is called as ‘powerhouse of the cell’ ?
Ans. Because it helps in the oxidation of food and release of energy in the form of ATP.
Q.10. Why plastids are called the ‘kitchens of the cell’ ?
Ans. Because they contain pigments which can trap sun’s energy and convert it into chemical energy, i.e., food called glucose.
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