Competitive Exams: Botany MCQs (Practice-Test 69 of 104)

  1. ‘Congress grass’ belongs to the genus

    1. Veriveria

    2. Cynodon

    3. Parthenium

    4. Lanrana

  2. Match List I (genera) with List II (family) and select the correct answer using the codes given below the lists:

    List-I List-II
    1. Dianthus

    2. Cucumis

    3. Cletnatis

    4. Vigna

    1. Fabaceae

    2. Cucurbitaceous

    3. Caryophyllaceous

    4. Ranunculaceae

    • A
    • B
    • C
    • D
      • 3
      • 2
      • 4
      • 1
      • 3
      • 2
      • 1
      • 4
      • 2
      • 3
      • 1
      • 4
      • 2
      • 3
      • 4
      • 1
  3. The two largest among the families of flowering plants in the Indian flora would include

    1. Solanaceae and Palmae

    2. Graminae and Leguminosae

    3. Cruciferae and Labiatae

    4. Liliaceae and Rutaceae

  4. Which one of the following is the correct sequence describing photosynthetic electron transport from PS II to PS I?

    1. P680 − Q-plastoquinone, cytochrome f, plastocyanin, P700

    2. P680 − Q-cytochrome f, plastoquinone. Plastocyanin, P700

    3. P680 − Q-plastocyanin, plastoquinone, cytochronie f, P700

    4. P680 − Q-plastocyanin, cytochrome f, plastoquinone f, P700

  5. Photosynthetic oxygen-producing cells differ from non-oxygen producing cells in that the former

    1. Produce one ATP whereas the latter produce two

    2. Produce no NADPI-1 whereas the latter do

    3. Reduce ferredoxin whereas the latter do not

    4. Contain and use both photo systems I and II

  6. The enzyme RuBISCO plays a dual function in chloroplasts during photosynthesis and produces either 3-phosphoglyceric acid or glycolic acid under different environmental conditions. Under which one of the following conditions would glycolic acid be formed?

    1. In C3 plants when the CO2 concentration is higher than that of oxygen

    2. In C3 plants when the oxygen concentration is higher than that of CO2

    3. In C4 plants when the oxygen concentration is higher than that of CO2

    4. In C4 plants when the CO2 concentration is higher than that of oxygen

  7. Ornithine, canavanine and homogenize are examples of

    1. Carboxylic acids that do not contain amino groups

    2. Protein-forming amino acids

    3. Non-protein-forming amino acids

    4. Alkaloids and drugs containing a benzene ring

  8. Which one of the following combinations is applicable to bacterial photosynthesis?

    1. Chlorophyll a and c; oxygen evolution; light absorption at wavelengths greater than 700 nm

    2. Chlorophyll a; no oxygen evolution; light absorption at wavelengths between 400 and 500 nm

    3. Bacteriochlorophyll; oxygen evolution; light absorption at wavelengths shorter than 700 nm

    4. Bacteriochiorophyll; no oxygen evolution; light absorption at wavelengths greater than 700 nm

  9. Hyper saline and hyper thermal aquatic/environments are inhabited mostly by

    1. Eubacteria

    2. Archaebacteria

    3. Cyanobacteria

    4. Microfungi

  10. Which one of the following pairs of elements would initiate and promote pollen germination?

    1. Carbon-ana iron

    2. Calcium and boron

    3. Boron and iron

    4. Iron and calcium

  11. Normally, a dorsiventral leaf contains more stomata on its lower epidermis than on its upper epidermis. Which of the following explanation (s) is/are true in this regard?

    1. Such an arrangement permits water vapor to come out of the leaf more easily under the influence of gravity.

    2. 2. The molecular weights of CO2 and 02 are 44 and 32 respectively. At night there is no photosynthesis to remove the respiratory C02, which due to its greater density comes out more easily through the stomata at the lower surface of the leaves.

    3. This reduces the chances of excessive water loss through the stomata because the lower surface is shaded away from the direct illumination of sunlight.

    Select the correct answer using the codes given below:

    Codes:

    1. 1 alone

    2. 2 alone

    3. 3 alone

    4. 2 and 3

  12. The most potent biofertilizer for sugarcane is

    1. Azotobacier

    2. Acetobacrer

    3. Clostridium

    4. Rhizobium

  13. Match List I (nutrient) with List Ii (deficiency symptom in leaf) and select the correct answer using the codes given below the lists:

    List-I List-II
    1. Phosphorus

    2. Potassium

    3. Manganese

    4. Calcium

    1. Lower leaves yellow between veins; purplish color of petiole

    2. Discoloration of leaf, starting from margins and extending towards mid-rib

    3. Dead tissues around the margins and in between the veins of the leaves

    4. Development of chlorosis in patches in dicots and in stripes in monocots

    • A
    • B
    • C
    • D
      • 1
      • 2
      • 3
      • 4
      • 2
      • 1
      • 3
      • 4
      • 1
      • 2
      • 4
      • 3
      • 2
      • 1
      • 4
      • 3
  14. Match List I with List II and select the correct answer using the codes given below the lists:

    List-I (Significance of the phenomenon in cell-water relations) List-II (Quantity)
    1. Degree of hydration of protoplasm

    2. Stretches cell walls and may lead to their enlargement if the walls are sufficiently plastic

    3. Increases the free energy of water molecule

    4. Indicates the direction of diffusion of water

    1. Wall pressure

    2. Water potential

    3. Turgor pressure

    4. Osmotic potential

    • A
    • B
    • C
    • D
      • 1
      • 3
      • 2
      • 4
      • 4
      • 3
      • 1
      • 2
      • 4
      • 1
      • 2
      • 3
      • 3
      • 4
      • 2
      • 1
  15. Consider the following events in DNA replication

    1. Formation of RNA primers by RNA polymerase

    2. Removal of RNA primers and formation of Okazak fragments

    3. Formation of DNA strands on RNA primers by poly Ill-copoly III complex

    4. Recognition of initiation point by initiation proteins

    5. Dissociation of hydrogen bonds and opening of a ‘bubble’ in the duplex by unwinding proteins

    6. Filling up of the gaps between Okaaki fragments and formation of DNA strand

    The correct sequence of these events is

    1. 4, 5, 1, 3, 2, 6

    2. 4, 1, 5, 2, 3, 6

    3. 4, 5, 2, 1, 3, 6

    4. 4, 5, 1, 2, 3, 6