86. The normal temperature of human in the Kelvin scale is-

  1. 273
  2. 290
  3. 300
  4. 310

View Answer/Explanation

Answer – (4)

In degree Celsius, it is 37 °C, so when converted to kelvin it becomes 310 i.e. 273 K+37 °C =  310 K

87. Fruits stored in a cold chamber exhibit longer storage life because-

  1. Exposure to sunlight is prevented
  2. Rate of respiration is decreased
  3. There is an increase in humidity
  4. The concentration of CO2 in the environment is increased

View Answer/Explanation

Answer – (2)

Fruits respire. They give out ethylene which helps in ripening. When fruits are kept in cold storage the rate of ethylene production can be controlled and thus the self-life of fruits can be increased.

88. Which of these are microscopic, unicellular, and prokaryotic organisms-

  1. Monera
  2. Protista
  3. Fungi
  4. Plantae

View Answer/Explanation

Answer – (1)

Monera- are microscopic, unicellular, and prokaryotic organisms. Ex- bacteria, blue-green algae.

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