Name the smallest known cell.
Q.1. Name the smallest known cell.
Ans. Pleuro-Pneumonia Like Organism (PPLO). It is about 0.1 u in diameter.
Q.2. Name the largest known cell.
Ans. An ostrich egg cell is the largest known cell. It is about 170 x 135 mm in size.
Q.3. Name the longest cell of the human body.
Ans. A nerve cell is the longest cell of the human body.
Q.4. Name two unicellular animals.
Ans. Amoeba and Paramecium.
Q.5. Name the nucleic acids present in the cell.
Ans. RNA and DNA.
Q.6. What is the full form of RNA and DNA?
Ans. RNA – Ribonucleic acid.
DNA- Deoxyribonucleic acid.
Q.7. Give examples of prokaryotic cells.
Ans. Cells of bacteria and blue-green algae.
Q.8. What are chromosomes made of ?
Ans. Chromosomes are made of DNA and histone proteins. (Deoxyribonucleic acid).
Q.9. Where are genes located?
Ans. The genes are located on the chromosomes.
Q.10. What is the chemical composition of cell wall in plants and fungi respectively ?
Ans. In plants, cell wall is made-up of cellulose and in fungi it is made-up of chitin (Fungal cellulose).
Q.11. What is the main function of a vacuole?
Ans. Vacuoles are involved in the maintenance of water balance in animals, while in plants they provide turgidity and rigidity to the cell.
Q.12. What is a nucleoid ?
Ans. Naked nuclear material of a prokaryotic cell is called nucleoid.
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