Competitive Exams: Botany MCQs (Practice-Test 101 of 104)

  1. Barring the Himalayan region, India can be divided into following four major vegetation zones:

    1. Tropical deciduous forests

    2. Tropical rain forests

    3. Thorn and scrub forests

    4. Tidal forests

    The correct sequence of the descending order in terms of the areas occupied by these zones is

    1. 1, 2, 3, 4

    2. 1, 2, 4, 3

    3. 2, 1, 3, 4

    4. 2, 1, 4, 3

  2. Consider the following statements: Besides the Sunder bans, mangrove forests are also to be found in

    1. Bhitara Kamka

    2. Godavari delta

    3. Pitchavaram

    4. Kaveri delta

    Of these statements

    1. 1, 2 and 4 are correct

    2. 1, 3 and 4 are correct

    3. 2 and 3 are correct

    4. 1.2, 3 and 4 are correct

  3. The species which have a restricted distribution are known as

    1. Ecospecies

    2. Allopatric species

    3. Sympatric species

    4. Endemic species

  4. Match List I (plants) with List II (typical habitat) and select the correct answer using the codes given below the lists:

    List-I List-II
    1. Utricularia

    2. Anagallis

    3. Loranthus

    4. Rhizophora

    1. Desert

    2. On tree branches

    3. Water

    4. Wheat fields

    5. Mangroves

    • A
    • B
    • C
    • D
      • 3
      • 4
      • 5
      • 2
      • 4
      • 1
      • 2
      • 5
      • 5
      • 1
      • 2
      • 3
      • 3
      • 4
      • 2
      • 5
  5. Consider the following statements: Conservation, preservation and further enhancement of vegetation cover on the earth would

    1. Reduce the greenhouse effect.

    2. Check thickening of the ozone layer.

    3. Save valuable gene pools.

    4. Reduce ecological backlashes.

    Of these statements

    1. 2 and 4 are correct

    2. 1, 2 and 3 are correct

    3. 1, 3 and 4 are correct

    4. 1, 2, 3, and 4 are correct

  6. Which of the following are endangered plants?

    1. Saintpaulia ionantha

    2. Ceratozamia hildae

    3. Punica granatum

    4. Senecio hadrasomum

    Select the correct answer

    1. l, 2 and 3

    2. l, 2 and 4

    3. 2, 3 and 4

    4. 1, 3 and 4

  7. In the initial stage of protoplast culture sorbitol/mannitol is included

    1. As an additional source of carbon

    2. As an additional source of energy

    3. To keep cells alive after the removal of cell wall

    4. As osmotic stabilizer.

  8. Consider the following table: Table of statistics: Oven thy biomass yields of three different components of four tree species (5-year old). (tonnes per hectare) Tree Name Stem Bran ch Leaf Total (tonne/hectare)

    1. Eucalyptus 25 15 10 50

    2. Leucaena 22 13 5 40

    3. Acacia 20 7.5 2.5 30

    4. Casuarina 15 3.5 1.5 20

    Which one of these trees has produced the highest percentage of stem biomass?

    1. Casuarina

    2. Acacia

    3. Leucaena

    4. Eucalyptus

  9. Which one of the following is a phosphate solubilising microorganism?

    1. Bacillus subtills

    2. Acetobacter diazotroph

    3. Rhizobium radicicola

    4. Azotobacter vinelandii

  10. Which of the following pairs are correctly by matched?

    1. Assimilatory root: …Photosynthesis

    2. Fasciculate root: …Food storage

    3. Stilt root: …Mechanical support

    4. Sucking root: …Absorption of moisture from the air

    Select the correct answer

    1. 2, 3 and 4

    2. 1, 2 and 4

    3. 1.3 and 4

    4. 1, 2 and 3

  11. Which one of the following sets consists only of xerophytes plants?

    1. Suhabool, Teak, eucalyptus, mango

    2. Baman, Acacia, zizvphus, teak

    3. Safflower, eucalyptus, asparagus, acacia

    4. Acacia, prosopis, zizvphus, opuntia

  12. Excessive aerenchyma yissues in the plants is mainly an adaptation for

    1. Xerophytes condition

    2. Hydrolytic condition

    3. Epiphytic condition

    4. Niesophvtic condition

  13. In respect of many grasses, the presence of motor cells in the upper epidermis of leaves is to

    1. Increase the surface area of the leaf

    2. Store large amounts of water

    3. Check transpiration by reducing the surface area of the leaf

    4. Bear unicellular trachoma's

  14. Which one of the following is effective in fixing coastal sand belts?

    1. Acacia nilotica

    2. Pongamia pinuata

    3. Casuarina equisetifolia

    4. Terminalia arjuna

  15. Water pollution is best assessed by determining

    1. DO and BOD

    2. BOD and turbidity

    3. Do and acidity

    4. BOD and turbidity