Competitive Exams: Botany MCQs (Practice-Test 49 of 104)

  1. Consider the following statements Cytochrornes are small proteins that contain a cofactor copper Plastocyanin carries electrons on its metal atom iron Which of the statements given above is/are correct?

    1. 1 only

    2. 2 only

    3. Both 1 and 2

    4. Neither 1 nor 2

  2. Which one of the following is the competitive inhibitor of succinct dehydrogenate which participates in Krebs cycle?

    1. Malonate

    2. Succinate

    3. Citrate

    4. Fumarate

  3. A germinating mustard seed converts its lipids into sugars by

    1. TCA cycle

    2. Glyoxylate cycle

    3. Calvin cycle

    4. Glycotate pathway

  4. Consider the following statements:

    1. Mycorrhizae decrease the efficiency of plants to absorb phosphorus from the soil

    2. Only certain prokaryotes synthesize the enzyme nitrogen's

    Which of the above statements s/are correct?

    1. 1 only

    2. 2 only

    3. Both 1 and 2

    4. Neither 1 nor 2

  5. Consider the following compounds:

    1. Pyridoxal phosphate

    2. Tetrahydrofdlate

    3. Thiamine pyrophosphate

    4. Lipoid acid

    Which of the above belong to the coenzymes of Pyruvate dehydrogenate complex?

    1. 1 only

    2. 2 only

    3. Both 1 and 2

    4. Neither 1 nor 2

  6. Which one of the following is the essential nutrient element required in the photosynthetic oxidation of water?

    1. Magnesium

    2. Iron

    3. Manganese

    4. Molybdenum

  7. Consider the following statements:

    1. Cutin is a fatty acid polymer

    2. Starch is composed only of glucose residues

    Which of the statements given above is/are correct?

    1. 1 only

    2. 2 only

    3. Both 1 and 2

    4. Neither 1 nor 2

  8. Which one of the following is the causative factor of guttation?

    1. Temperature

    2. Sunlight

    3. Osmosis

    4. Root pressure

  9. Consider the following plants:

    1. Curcuma longa

    2. Ferula asafoetida

    3. Myristica fragrans

    4. Smilax aristolochiaefolia

    From which of the above plants are underground parts used for obtaining spices or products of commercial value?

    1. 1 and 2

    2. 3 and 4

    3. 1, 2 and 4

    4. 1, 2, 3 and 4

  10. The verbalization effect is perceived by the

    1. Leaf tip

    2. Shoot apex

    3. Root

    4. Petiole

  11. Dormancy is induced by

    1. Brassins

    2. Polyrnines

    3. Abscises acid

    4. Indoleacetic acid

  12. Application of which of the following hormones delays the onset of senescence in detached leaves?

    1. Ethylene

    2. Abscises acid

    3. Gibberellins

    4. Cytokine

  13. Caffeine, a constituent of tea and coffee is actually

    1. A polyamine

    2. An oligosaccharide

    3. An alkaloid

    4. A lipoprotein

  14. In photoperiodic induction to flowering, what is the site of perception?

    1. Partially mature leaves

    2. Older leaves

    3. Entire plant

    4. Apical meristem

  15. The enzyme nitrogen's that fixes atmospheric nitrogen in the root nodules of leguminous plants comprises two subunits, the composition of each respectively being

    1. Fe-protein and Fe-Mo-protein

    2. Mo-protein and Fe-Mo-protein

    3. Va-protein and Fe-Mo-protein

    4. Fe-protein and Fe-Va-protein