Competitive Exams: Botany MCQs (Practice-Test 75 of 104)

  1. Double fixation of CO2 take place both in C4 and CAM plants. Which one of the following statements brings out the main difference between the two?

    1. The two carboxyl sing enzymes in the two plants are different

    2. CO2 fixation in C4 plants is separated by space, whereas in CAM plants, it is separated by time

    3. The two pathways of CO2 fixation are different in these two plants

    4. The compensation points in these two plants are different

  2. Which one of the following statements best supports the fact that photorespiration process commonly occurs in C3 plants?

    1. C3 plants do not possess Karanz anatomy

    2. C3 plants are usually high CO2 compensation species

    3. C3 plants are less efficient in photosynthesis

    4. C3 plants are characterized by RuBP oxygenize activity under high oxygen supply.

  3. Which one of the following enzymes is responsible for the synthesis of DNA from RNA polymerase?

    1. RNA polymerase

    2. DNA polymerase

    3. Reverse transcriptase

    4. DNA lipase

  4. Ammonia is oxidized to nitrite by

    1. Nitrobacter

    2. Nitrosamines

    3. Bacillus denitrificans

    4. Azotobactor

  5. The whole process of aerobic respiration takes place in the

    1. Mitochondria

    2. Mitochondria and paroxysms

    3. Mitochondria and cytosol

    4. Cytosol

  6. Match List I (coenzymes of transfers) with List II (functions) and select the correct answer.

    List-I List-II
    1. Biotin

    2. Coenzyme A

    3. Thymine pyrophosphate

    4. Uri dine diphosphate

    1. Carboxylation

    2. Active aldehyde transfer

    3. Sugar transfer

    4. Acryl group transfer

    • A
    • B
    • C
    • D
      • 1
      • 4
      • 2
      • 3
      • 4
      • 1
      • 2
      • 3
      • 1
      • 4
      • 3
      • 2
      • 4
      • 1
      • 3
      • 2
  7. Which one of the following hem proteins serves as electron carrier in both reparation and photosynthesis?

    1. Phytochrome

    2. Ferredoxin

    3. Cytochrome

    4. Cryptochrome

  8. Match List I with List II and select the correct answer.

    List-I List-II
    1. Richnmond lang effect

    2. Emerson effect

    3. Pasteur effect

    4. Warburg effect

    1. Reversal of red-drop

    2. Inhabitation of glycol sis by oxygen

    3. Inhibition of photosynthesis by oxygen

    4. Senscescence retardation in detached leaves

    • A
    • B
    • C
    • D
      • 1
      • 4
      • 2
      • 3
      • 4
      • 1
      • 3
      • 2
      • 1
      • 4
      • 3
      • 2
      • 4
      • 1
      • 2
      • 3
  9. Which one of the following is a mitochondrial maker enzyme?

    1. Aldolase

    2. Amylase

    3. Succinct dehydrogenate

    4. Pyruvate dehydrogenate

  10. Which one of the following enzymes is used in PCR reaction?

    1. Taq polymerase

    2. RNA polymerase

    3. Rib nuclease

    4. End nuclease

  11. RUBISCO is made up of

    1. 14 subunits

    2. 15 subunits

    3. 16 subunits

    4. 18 subunits

  12. Match the following essential elements (List I) with their respective roles (List II) and select the correct answer.

    List-I List-II
    1. Chlorine

    2. Copper

    3. Molybdenum

    4. Zine

    1. Constituent of plastocyanin

    2. Constituent of nitrate reeducates

    3. Constituent of alcohol dehydrogenate

    4. Required for O2 evolution in photosynthesis

    5. Required for phosphate transfer

    • A
    • B
    • C
    • D
      • 4
      • 1
      • 3
      • 2
      • 1
      • 2
      • 5
      • 3
      • 1
      • 4
      • 5
      • 2
      • 4
      • 1
      • 2
      • 3
  13. Molybdenum deficiency in plants is rare because it is

    1. Absorbed from soil in abundance

    2. The constitute net of the enzyme nitrate reeducates

    3. required by plants only in trace amounts

    4. Not readily absorbed

  14. The osmotic pressures of 0.1 glucose and 0.1 M sucrose solutions are the same because

    1. Both are carbohydrates

    2. These are different compounds having different molecular weights

    3. Both are present in the same concentration

    4. Glucose is reducing sugar while sucrose in non-reducing sugar

  15. The natural rubber obtained as latex from Hevea resiliencies is a

    1. Diterpene

    2. Triterpene

    3. Tetraterpene

    4. Polyterpene