81. In night, when photosynthesis is stopped, plants
(A) take in Carbon Dioxide
(B) take in Oxygen
(C) give off Carbon Dioxide
(D) give off Oxygen
The answer is: (C) give off Carbon Dioxide ☑
82. During photosynthesis, plants
(A) take in Carbon Dioxide
(B) take in Oxygen
(C) give off Carbon Dioxide
(D) give off Oxygen
The answer is: (D) give off Oxygen ☑
83. __________ are called the powerhouses of the cell.
(A) Mitochondria
(B) Vesicles
(C) Lungs
(D) Liver
The answer is: (A) Mitochondria ☑
84. Mitochondria contain their own supply of
(A) DNA
(B) Amino acids
(C) Vitamins
(D) Oxygen
The answer is: (A) DNA ☑
85. The first chemical explosive, Gunpowder, is a mixture of
(A) Sulfur, Charcoal and Nitrogen Oxide
(B) Sulfur, Charcoal, and Potassium Nitrate
(C) Sulfur and Charcoal
(D) Charcoal and Potassium Nitrate
The answer is: (B) Sulfur, Charcoal, and Potassium Nitrate ☑