Answers of Quiz 2082 (Robert Hooke and Cell)

1. On 18/28 July 1635 in England
2. In 1665
3. Hooke's Law is a principle of Physics that states that the force (F) needed to extend or compress a spring by some distance (X) is proportional to that distance. That is: F = kX, where k is a constant factor characteristic of the spring: its stiffness, & X is small compared to the total possible deformation of the spring.
4. On 3 March 1703
5. Cell is the smallest unit of life. It is called basic building block of all living things. It is also called basic structural, functional & biological unit of all known living organisms.
6. Small room
7. Cytology or Cell Biology
8. Cell Membrane, Cytoplasm, Nucleus
9. Cell Wall, Cell Membrane, Cytoplasm, Nucleus
10. Plasma Membrane or Cell Membrane
11. Cytoplasm of human cell possess: Endoplasmic reticulum, Golgi Complex, Mitochondria, Centrioles, Ribosomes & Vacuoles. Plant Cells also possess Plastids.
12. Nucleus is filled with a gel like substance called Nucleoplasm. Nucleoplasm contains Nucleoli & a network of thread like structures called Chromatin Network. Each thread is called Chromosome. Chromosomes are composed of DNA. DNA plays significant role in inheritance of characters as well as in controlling or regulating cell activities.
13. Mitochondria
14. Ribosome
15. 46 chromosomes (22 homologous chromosome pairs & a pair of sex chromosomes)
16. Trillions of cells
17. Fertilized egg
18. Tissue
19. Organ
20. System
21. Organism (animal or plant)
22. Single-celled organisms are called unicellulars.
23. Organisms formed of many cells are called multicellulars.
24. There are two main types of cell division: Mitosis & Meiosis. In Mitosis, a parent cell divides into two daughter cells in a way that the number of chromosomes in the daughter cells remains the same. Mitosis is responsible for development & growth of organisms. In Meiosis, a parent cell divides into four daughter cells in a way that the number of chromosome in each daughter cell reduce to half. In animals Meiosis produces gametes (sperms & eggs) while in plants it gives rise to spores.

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