Competitive Exams: Botany MCQs (Practice-Test 42 of 104)

  1. Which one of the following types of vegetations allows quick absorption of maximum rain water?

    1. Wet evergreen forests

    2. Grasslands

    3. Scrub forests

    4. Deciduous forests

  2. Consider the following statements regarding allelopathy:

    1. It is the phenomenon of seed dormancy due to the presence germination inhibitors on the surface of seed coat.

    2. It is the phenomenon of the production of organic substances by one plant having handful effect on the other.

    3. It helps proper spacing of the plants to reduce competition.

    4. It helps the xerophytes to grow in small groups to reduce the transpiration.

    Of these statements:

    1. 1, 2 and 3 are correct

    2. 1 and 3 are correct

    3. 2 and 3 are correct

    4. 1 and 4 are correct

  3. Nepenthes Khasiana, a rare and endangered pither plant, occurs in India in

    1. Meghalaya

    2. Madhya Pradesh

    3. Kerala

    4. Himachal Pradesh

  4. Which of the following statements are correct?

    1. callus is the disorganized mass of cells formed under in vitro condition.

    2. totipotency is the ability of a plant organ to regenerate an entire organism when cultured in a suitable medium.

    3. embroyoid is the embroyo-like structure formed under in vitro condition which has the potentiality to develop into a plantlet.

    4. explant is the excised portion of plant tissue or organ which is used in tissue culture study.

    Select the correct answer using the codes given below:

    Codes:

    1. 1, 2 and 4

    2. 1, 3 and 4

    3. 1, 2 and 3

    4. 2, 3 and 4

  5. Which of the following pairs are correctly matched?

      • Somatic hybridization
      • Protoplast fusion
      • Industry
      • Bioreactors
      • Test-tube baby
      • Artificial fertilization
      • Monoclonal
      • Gene therapy

    Select the correct answer using the codes given below:

    Codes:

    1. 2, 3 and 4

    2. 1, 3 and 4

    3. 1, 2 and 4

    4. 1, 2 and 3

  6. ‘Superbug’ a biotechnological feat is useful in the

    1. Treatment of Cancer

    2. Cleaning oil Spillage

    3. Espionage

    4. Biodegradation of plastics

  7. Which one of the following statements regarding Pomato is correct?

    1. It is a product of somatic hybridization

    2. It is obtained by gene manipulation

    3. It is a natural hybrid product of sexual reproduction

    4. It is the fusion product of archegonia and antheridia

  8. Which one of the following gases was primarily responsible for the 1984 Bhopal gas tragedy?

    1. Methane

    2. Methyl cyanide

    3. Methyl isocyanine

    4. Hydrogen cyanide

  9. Depletion of the Ozone layer in the stratosphere is caused by

    1. Carbon monoxide

    2. Hydrocarbons

    3. Nitrogen dioxide

    4. Polychloro-biphenyls

  10. A forestation with the pin pose of environmental, aesthetic and economic development is known as

    1. Integrated afforest ion

    2. Scientific forest conservation

    3. Social forestry

    4. Integrated forest management

  11. A forestation programmes call for the introduction of plants form

    1. Desert regions as these can withstand adverse conditions

    2. Arctic environment because of their short stature and sturdiness

    3. Iso-climatic regions

    4. And environment of maximum heterogene1t

  12. The uniform peeling away of the soil surface by the action of flowing water is Called

    1. Slip erosion

    2. Till erosion

    3. Accelerated erosion

    4. Sheet erosion

  13. Consider the following steps in plant introduction:

    1. Site selection and study.

    2. Quarantine/plant protection inspection.

    3. Species selection and import of seeds.

    4. Seed treatment, nursery development and planting.

    The correct sequence of these steps is

    1. 4, 2, 1, 3

    2. 3, 4, 2, 1

    3. 1, 3, 2, 4

    4. 2, 1, 4, 3

  14. When exposed to sulphur dioxide gas, the green color of the plant leaves will be changed into

    1. Violet

    2. Indigo

    3. Red

    4. yellow

  15. Which one of the following aspects will not alter the gene frequency in a population?

    1. Section

    2. Mutation

    3. Random mating

    4. Random genetic drift