Competitive Exams: Botany MCQs (Practice-Test 72 of 104)

  1. Consider the following steps:

    1. Isolation of tissue from the plant

    2. Digestion of cell walls with cellular enzyme

    3. Preparation of culture medium

    4. Separation of the naked protoplasts culturing them in the medium

    The correct sequence of the steps to be followed to culture protoplasts is

    1. 1, 2, 3, 4

    2. 1, 3, 2, 4

    3. 4, 1, 2, 3

    4. 4, 2, 1, 3

  2. Which of the following chemicals are added in the synthetic media for culturing plant tissues?

    1. Auxins

    2. Cycloheximide

    3. Cytokinins

    4. Casein hydrolysate

    Select the correct answer using the codes given below:

    Codes:

    1. 1, 2 and 3

    2. 2, 3 and 4

    3. 1, 3 and 4

    4. 1, 2, and 4

  3. Entropy

    1. Increases in a community undergoing primary succession

    2. Requires no energy for doing work

    3. Decreases in a community due to the action of decomposers

    4. Requires an excess of energy to do work

  4. As one moves up an ecological pyramid, in general

    1. The biomass increases

    2. Photosynthesis increases

    3. Energy levels decrease

    4. Productivity increases

  5. Which one of the following pairs is correctly matched?

      • Somatic
      • Bud culture embryogenesis
      • Clonalon propagat
      • Organ culture
      • Tissue culture
      • Bipola embryos
      • Protoplast fusion
      • Somatic hybrid
  6. Consider the following micro algae:

    1. Spirulina

    2. Dunaleilla

    3. Spirogyra

    4. Botryococcus

    The micro algae of commercial interest would include

    1. 1, 3 and 4

    2. 1, 2 and 4

    3. 1, 2 and 3

    4. 3 and 4

  7. A community of organisms interacting with a biotic environmental factors constitutes

    1. A niche

    2. A biogeochemical cycle

    3. An ecosystem

    4. A food chain

  8. Mushroom is referred to as a vegetable meat because it

    1. Contains proteins

    2. Contains vitamins and carbohydrates

    3. Contains folic acid and amino acids

    4. Is rich in proteins and minerals

  9. Two good examples of obligate plantanimal Mutualism would include

    1. Mycorrhiza and fairy rings

    2. Lichens and corraloid roots of Cycas

    3. AzolIa-Anabaena symbiosis and sunflower-butterflies

    4. Acacia-ants and Yucca-yucca moth

  10. Which of the following would be helpful in forming algal blooms by the members of cyan bacteria?

    1. Formation of zoospores

    2. Ability to move to the desire position in the water column

    3. Development of gas vacuoles

    4. Formation of biconcave separation discs

    Select the correct answer using the codes given below:

    Codes:

    1. 1, 2 and 3

    2. 1 and 4

    3. 2 and 3

    4. 3 and 4

  11. Which one of the following adaptations is found desert plants?

    1. Absence of root hairs

    2. Presence of spongy stem

    3. Presence of strongly cutinized epidermal cells

    4. Presence of pneumatophores

  12. In the food and energy pyramid, the sequence-from base upwards is

    1. Aquatic insects-fishes-flowering plants-trees

    2. Primitive animals-higher animals-man who plants and animals-carnivorous animals

    3. Plants-animals that eat plants-animals that eat plants and animals-carnivorous animals

    4. Aquatic plants-terrestrial plantscarnivorous animals-large trees-man

  13. The protective ozone shield is to be found in the

    1. Hydrosphere

    2. Ionosphere

    3. Stratosphere

    4. Troposphere

  14. The spread of Eichhornia can be checked by

    1. Spraying 2, 4 − D

    2. Allowing cattle to feed on them

    3. Introducing insects

    4. Clipping off the vegetative buds

  15. Agar-agar is extracted mostly from

    1. Agaricus spp

    2. Argemone spp

    3. Rhodophyceae spp

    4. Phaeophyceae spp