Holidays Homework
CLASS-9TH
Sub-Biology
1. What is the structural and functional unit of life?
2. Who discovered the cell?
3. What is a prokaryotic cell?
4. Who stated "omnis cellula e cellula"?
5. Give the term for the incipient nucleus of prokaryotes.
6. Name two types of cells.
7. Name the smallest sized organism.
8. Define diffusion.
9. Give the term for the movement of water from higher water concent
to lower water concentration.
10. Name two forms of osmosis.
11. What is the effect of hypertonic solution on human RBCs.?
12. By which process Amoebe engulfs the food particles.
13. What is the most acceted model of structure of plasma membrane?
Answers
7.Microoraganism is the smallest organism in this word. Size of microorganism is measured by microns.
1. Cell is the structural and functional unit of life.
2. Robert Hocke discovered the cell.
3. A cell with primitive nuclues is called prokaryotic cell.
4. Virchow stated this sentences.
5. Incipient nucleus often called as nucleoid refers to immature nucleus of prokaryotes.
6. i) Eukaryotic cell
ii) Prokaryotic cell.
7. Mycoplasma genitalium is the smallest organism.
8. Spreading of molecules from more abondend place to less abondend place due to own kinetic energy is called diffusion.
9. Osmosis is the process for the movement of water from higher concentration to lower concentration.
10. Two types of osmosis are hypotonic and hypertonic.
11. Because of the differences in the osmotic forces inside and outside of the cell, red blood cells will shrink in ahypertonic solution.
12. The process is known as endosytosis.
13. The model, which was devised by SJ Singer and GL Nicolson in 1972, describes the cell membrane as a two-dimensional liquid that restricts the lateral diffusion of membranecomponents.The fluid mosaicmodel is the most acceptable modelof the plasma membrane. Its main function is to give shape to the cell.
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