Competitive Exams: Botany MCQs (Practice-Test 12 of 104)

  1. From which one of the following plants, the insecticide pyrethrum is prepared?

    1. Vetiveria

    2. Cymbopogon

    3. Chyrysanthemum

    4. Tephrosia

  2. Match List I with List II and select the correct answer:

    List-I List-II
    1. The amount of energy accumulation in green plants through the process of photosynthesis

    2. The total organic matter synthesized by the producers in the process of photosynthesis per unit time & area

    3. Rate of storage of organic matter in plant tissues in excess of the respiratory utilization during the measurement period

    4. Rate of energy storage at consumer level

    1. Gross primary productivity

    2. Primary productivity

    3. Secondary productivity

    4. Net primary productivity

    • A
    • B
    • C
    • D
      • 1
      • 2
      • 3
      • 4
      • 2
      • 1
      • 3
      • 4
      • 1
      • 3
      • 4
      • 2
      • 2
      • 1
      • 4
      • 3
  3. Which one of the following combinations would you consider suitable for a good commercial wood?

    1. Tracheids, Vessels, collenchyma, fibers, Medullary rays

    2. Tracheids, vessels, fibers, xylem parenchyma, medullary rays

    3. Xylem parenchyma, vessels, middle lammella, fibers collenchyma

    4. Tracheids, vessels, sclerenchyma, fivers, medullays rays

  4. Match List I (Name of fibre yielding plant) with List II (Nature/Origin of fibers) and select the answer:

    List-I List-II
    1. Cotton

    2. Flax

    3. Kapok

    4. Coconut

    1. Bast fibers

    2. Structural fibers

    3. Surfaces fibers from seed

    4. Fiberous mesocarp

    5. Inner wall of fruit

    • A
    • B
    • C
    • D
      • 4
      • 2
      • 5
      • 1
      • 3
      • 2
      • 4
      • 1
      • 3
      • 1
      • 5
      • 4
      • 2
      • 1
      • 3
      • 4
  5. Petrocrops are highly promising biomass energy sources because these crops

    1. Helps to conserve soil and water

    2. Are a principal source of energy in rural areas

    3. Are an essential renewable energy source

    4. Contain high amount of biocrude chemicals

  6. Phanerophytes are further classified into following four sub-life forms depending upon the height of mature plants:

    1. Nanophanerophytes

    2. Microphanerophytes

    3. Megaphanerophytes

    4. Mesophanerophytes

    The correct sequence of these in descending order in

    1. 1, 2, 3, 4

    2. 4, 2, 3, 1

    3. 3, 4, 2, 1

    4. 3, 2, 1, 4

  7. Match List I (Vegetation areas) with List II (Area of distribution) and select the correct answer:

    List-I List-II
    1. Eastern Himalayas

    2. Western Himalayas

    3. Gangetic Plain

    4. Malabar

    1. Kumaon to Kashmir

    2. Sikkim to NEFA

    3. Gujarat to Kanyakumari

    4. UP to Bihar and Bengal

    • A
    • B
    • C
    • D
      • 4
      • 1
      • 3
      • 2
      • 4
      • 2
      • 1
      • 3
      • 2
      • 3
      • 4
      • 1
      • 2
      • 1
      • 4
      • 2
  8. Consider the following statements: The concept of growing multipurpose trees in Social Forestry and Agro-forestry is for

    1. Food

    2. Fuel

    3. Fruit

    4. Fodder

    Which of the above statements are correct?

    1. 1, 2 and 4

    2. 2, 3 and 4

    3. 1, 3 and 4

    4. 1, 2 and 3

  9. Beta (β) diversity means diversity

    1. Over a large area

    2. Within a site

    3. Over an area consisting of many habitats

    4. Over an area consisting of single habitat

  10. Cybrids are hybrids

    1. Produced by in u/tm fusion of gametes

    2. With full nuclear genomes of the two parents

    3. With full nuclear genome of one and partial nuclear enome of the other parent

    4. With nuclear genome of one and cytoplasm genome of the other parent

  11. Which of the following is NOT a freeliving nitrogen fixing bacterium?

    1. Azotobacter

    2. Rhizobium

    3. Clostridium

    4. Azospirillum

  12. Transgenic plants can act as living bioreactors for the production of chemicals and pharmaceuticals. This is known as

    1. Agriculture farming

    2. Molecular farming

    3. Phannacotechnology

    4. Organic farming

  13. Consider the following statements:

    1. bt gene has been introduced in some plants to provide resistance against attack by insects.

    2. Frost resistant tomato has been developed by incorporating a gene from polar fish.

    3. Transgenic plant products are being well received all over the world

    Which of the above statements are correct?

    1. 2 and 3

    2. 1, 2 and 3

    3. 1 and 3

    4. 1 and 2

  14. Match List I with List II and select the correct answer:

    List-I List-II
    1. Nitrogen fixation

    2. Denitrification

    3. Nitrification

    4. Ammonification

    1. Conversion of NH + 4 into nitrite and nitrate

    2. Conversion of nitrite or nitrate into atmosphere nitrogen

    3. Conversion of atmospheric nitrogen into ammonia

    4. Conversion of organic nitrogen into ammonia

    • A
    • B
    • C
    • D
      • 3
      • 2
      • 1
      • 4
      • 2
      • 1
      • 3
      • 4
      • 3
      • 2
      • 4
      • 1
      • 2
      • 4
      • 1
      • 3