Class XI

Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from. Siberia and other extremely cold northern regions move to :-
  1. Western Chat
  2. Meghalaya
  3. Corbett National Park
  4. Keolado National Park
A ball is moving in a circle at fixed speed. Which of the following statement is TRUE?(
  1. There is no acceleration present
  2. There must be only one force acting on it
  3. Acceleration is present but has constant magnitude
  4. Acceleration is present and acts tangent to the circle.
Which one of the following is wrongly matched?
  1. Transcription – Writing information from DNA to t–-RNA.
  2. Translation – Using information in m–-RNA to make protein
  3. Repressor protein – Binds to operator to stop enzyme synthesis.
  4. Operon – Structural genes, operator and promoter.
Which one of the following statements is not correct ?
  1. Retinal is the light absorbing portion of visual photo pigments
  2. In retina the rods have the photopigment rhodopsin while cones have three different photopigments.
  3. Retinal is a derivative of Vitamin C.
  4. Rhodopsin is the purplish red protein present in rods only.
In which one of the following processes CO2 in not released ?
  1. Aerobic respiration in plants
  2. Aerobic respiration in animals
  3. Alcoholic fermentation
  4. Lactate fermentation
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