Competitive Exams: Botany MCQs (Practice-Test 57 of 104)

  1. The diagram given below show the relation between influence of light intensity and CO2 concentration on the rate of photosynthesis of Chlorella: Which one of the following statements explains the diagram correctly?

    1. At low light intensity, the lightdependent reaction is rate limiting but at high light intensity, CO2 is rate limiting

    2. The number of chlorophyll molecules limits the rate of photosynthesis

    3. Photosynthesis is independent of light intensity provided there is no total darkness

    4. Chlorophyll responds equally to light intensities and CO2 concentration, thereby limiting the rate of photosynthesis.

  2. Which of the following pairs are correctly matched? Principal wavelength Physiological of light event

      • 700 nm
      • Photo system I
      • 650 nm
      • Photo system II
      • 690 nm
      • Photo system III
      • 620 nm
      • Phycocyanin

    Select the correct answer using the codes given below:

    1. 1, 2 and 4

    2. 1, 3 and 4

    3. 2 and 4

    4. 1 and 3

  3. The primary reaction in photosynthesis is photochemical and takes place in the chloroplast. It is accomplished by a chain of electron carriers with phosphorylation of ADP to ATP. The actual site for this reaction is

    1. Intrathylakoid space

    2. Thylakoid membrane

    3. Chloroplast envelope

    4. Stoma

  4. The number of double bonds in the phytoi chain of chlorophyll-a molecule is

    1. One

    2. Three

    3. Five

    4. Seven

  5. During photorespiration. In plants, ribulose bisphosphate is degraded to carbon dioxide after combining with oxygen. The correct sequence in which these products appear from ribulose bisphosphate in photerespiratoiy pathway, is

    1. senne, glyoxylate, glycine, glycolate

    2. glycolate, glyoxylate, glycine, nne

    3. glycine, serine, glycolate, glyoxylate

    4. glyoxylate glycolate, serme, glycine

  6. Which of the ibliowing pairs are correctly matched?

      • DNP
      • Respiratory uncouple
      • Kranz anatomy
      • C4 plants
      • Antimycin A
      • Inhibitor of protein synthesis
      • TCA cycle
      • Metabolic mill

    Select the correct answer using the codes given below:

    1. 1, 2 and 3

    2. 1, 3 and 4

    3. 1, 2 and 4

    4. 2, 3 and 4

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

    List-I List-II
    1. 6-ribulose 1, 5-diphosphate + 6 CO2 l2phosphoglycenc acid

    2. 5-fructose 1, 6 diphosphate 5 fructose 6 phosphate + 5P1

    3. 2-fructose 6-phosphate + 2-erythrose 4-phosphate 2-sedoheptulose 7 phosphate + 2 phosphoglyceialdehyde

    4. 6-ribulose 5-phosphate + 6 ATP 6 ribulose 1, 5-diphosphate + 6 ADP

    1. Transaldolase

    2. Epimerase

    3. Carboxylation enzyme

    4. Phosphoribulo-kinase

    5. Phosphatase

    • A
    • B
    • C
    • D
      • 3
      • 5
      • 1
      • 4
      • 2
      • 1
      • 3
      • 4
      • 1
      • 5
      • 2
      • 3
      • 3
      • 2
      • 4
      • 5
  8. Chemiosmosis refers to the view that an ion flowing down its electrochemical gradient drives ATP synthesis. The ion in question is

    1. Phosphate

    2. Sodium

    3. Iron

    4. Hydrogen

  9. In the first step glycol sis, the phosphorylation of glucose is coupled to

    1. The reduction of NAD +

    2. The synthesis of ATP

    3. The hydrolysis of ATP

    4. The loss of electron

  10. The most abundant enzyme protein on the Earth is

    1. Nitrogenase

    2. PEP carboxylase

    3. Rubisco

    4. Nitrate reductase

  11. Chlorosis is caused by the deficiency of

    1. Chlorine and boron

    2. Nitrogen and calcium

    3. Magnesium and iron

    4. Potassium and phosphorus

  12. The process of release of water through and intact plant is called

    1. Guttation

    2. Exudation

    3. Oozing

    4. Leakage

  13. Replication of DNA on its lagging strand is initiated by

    1. DNA polymerase III

    2. RNA primer

    3. DNA polymerase I

    4. DNA ligase

  14. The replication fork during DNA replication

    1. Is the at which the single-stranded regions appear

    2. Refers to the leading strand

    3. Refers to the site of base pair formation

    4. Is seen in transcription

  15. The RNA synthesized on DNA template in the nucleus differs from the mRNA in the cytoplasm in that it contains

    1. Segments transcribed form exons

    2. Segments transcribed form introns

    3. Uracil

    4. Thymine