Which is the only cell organelle visible in a prokaryotic cell ?
Q.1. Which is the only cell organelle visible in a prokaryotic cell ?
Ans. Ribosomes.
Q.2. Golgi apparatus have a system of membrane-bound vesicles arranged in parallel stacks. What are these called?
Ans. Cisterns.
Q.3. When observed under microscope, small pores are seen in the epidermis of the leaf. What are these pores called ? Write two functions of these pores.
Ans. Stomata.
(i) Help in exchange of gases.
(ii) Transpiration.
Q.4. What is the significance of golgi apparatus ?
Ans. (i) Golgi apparatus stores proteins and enzymes.
(ii) It helps in modification and packaging of products.
(iii) It helps in making of complex sugars from simple sugars.
(iv) It helps in the formation of lysosomes.
Q.5. How do lysosomes perform the functions of defence, digestion and cleansing in the cell ?
Ans. (i) Defence: Fights against foreign particles like viruses.
(ii) Digestion Helps in intracellular digestion of food particles.
(iii) Cleansing: Helps in removing dead, worn est best out cell organelles and eat up the damaged cell.
Q.6. (a) Which major invention led to the discovery of mach the microscopic world ?
(b) Name a single cell which may constitute a whole organism. What are they called ?
(c) Every multicellular organism has come from a single cell. Justify the statement.
Ans. (a) Discovery of microscope by Antony Von Leuwenhoek.
(b) Amoeba, unicellular organisms.
(c) Single cell is the zygote. It is the first cell formed after fertilisation.
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