6. Bring out the significance of
Transmission Electron Microscope.
1.It provides two dimensional images.
2.The magnification is 1-3 lakhs times and resolving power is 2-10Å.
3.It is used for studying detailed structure of viruses, mycoplasma, cellular organelles etc.
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7. State the protoplasm theory.
1.Corti first observed protoplasm Felix Dujardin (1835) observed a living juice in animal cell and called it "Sarcode".
2. Purkinje (1839) coined the term protoplasm for sap inside a plant cell.
3.Hugo Van Mohl (1846) indicated importance of protoplasm.
4.Max Schultze (1861) established similarity between protoplasm and sarcode and proposed a theory which later on called "Protoplasm Theory" by O. Hertwig (1892).
5.Huxley (1868) proposed protoplasm as a "Physical basis of life".
Protoplasm as a colloidal system:
1.Fischer in 1894 & Hardy in 1899 Proposed Colloidal theory of Protoplasm (the physical basis of life)
2.It is primarily made of water and various other solutes of biological importance such as glucose, fatty acids, amino acids, minerals, vitamins, hormones & enzymes.
Homogeneous: These solutes are soluble.
Heterogeneous: Mass insoluble in water which forms the basis for its colloidal nature.
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8. Distinguish between prokaryotes and
eukaryotes.
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9. Difference between plant and animal
cell.
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10. Draw the ultra structure of plant cell.
