281. A colloidal system in which a liquid is dispersed into a liquid is called_________?
A. Percipitate
B. Gel
C. Emulsion
D. Sol

282. Which metal is pure conductor of electricity?
A. Copper
B. Gold
C. Silver
D. lead

283. An example of rhizome is_________?
A. Carrot
B. Tomato
C. Ginger
D. Garlic

284. Which planet is called “red planet”?
A. Mars
B. Venus
C. Jupiter
D. Saturn

285. Which of these is a micronutrient of plants?
A. Oxygen
B. Nitrogen
C. Boron
D. Carbon

286. Diamond is harder than Graphite because of___________?
A. Difference in crystalline Structure
B. Tetrahedral structure of diamond
C. Difference in layer of atoms
D. None of these

287. A seed can germinate in the absence of__________?
A. Oxygen
B. Light
C. Moisture
D. Temperature

288. Tropism mostly refers to as_______?
A. Bird migration
B. Directional growth of a plant
C. Longevity of animal species
D. Behavioral pattern of human

289. “Green House Effect” means:____________?
A. Pollution
B. Prevention of ultraviolet rays
C. Trapping of Solar energy due to atmospheric carbon dioxide
D. D. None

290. Substance whose atoms can be split are known as __________ materials.
A. Fusionable
B. Fissionable
C. Combustible
D. None of these