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Answer
- c
- e
- d
- b
- a
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Match the following.
| Nitrogen-fixing bacteria | Vaccine |
| Tuberculosis | Prion |
| Kuru | Lactobacillus acidophilus |
| Probiotics | Bacteria |
| Edward Jenner | Rhizobium |
| i | Amoeba | (a) | Autotrophs |
| ii | Algae | (b) | Gills |
| iii | Agaricus | (c) | Biocontrol |
| iv | Bt cotton | (d) | Sporulation |
| i | Araucaria | (a) | Bryophyte |
| ii | Riccia | (b) | Fungi |
| iii | Marsilea | (c) | Gymnosperm |
| iv | Ashbya | (d) | Pteridophyte |
- Nostoc – (a) Pest
- Bacillus – (b) Cyanobacteria
- Cotton bollworm – (c) Legume
- Rhizobium – (d) Bio-pesticide
Match the following.
| Barometer | reduce friction |
| Increasing area of contact | Atmospheric pressure |
| Decreasing area of contact | cause of friction |
| Lubricants | increases friction |
| Irregular surface | decreases friction |
| 1. | Insulator | (a) | Coulomb |
| 2. | Conductor | (b) | Electric circuit |
| 3. | Closed path | (c) | Copper |
| 4. | Electric charge | (d) | Rubber |
| Column - I | Column - II | ||
| i | Friction | (a) | Measuring force |
| ii | Spring balance | (b) | Reduce friction |
| iii | Shape of aeroplane | (c) | Nature of surface |
| iv | Lubricants | (d) | Drag |
| v | Fluid friction | (e) | Bird |
| 1. | Solid to liquid | (a) | Condensation |
| 2. | Liquid to gas | (b) | Deposition |
| 3. | Gas to solid | (c) | Melting |
| 4. | Gas to liquid | (d) | Vaporization |
- Sulphuric acid – (a) Weak base
- Sodium hydroxide – (b) Strong acid
- Acetic acid – (c) Strong base
- Ammonium hydroxide – (d) Weak acid
Match the following.
| Column I | Column II | |
| a) | Static friction | Viscosity |
| b) | Kinetic friction | Least friction |
| c) | Rolling friction | Objects are in motion |
| d) | Friction between the liquid layers | Objects are sliding |
| e) | Sliding friction | Objects are at rest |