Competitive Exams: Botany MCQs (Practice-Test 54 of 104)

  1. Consider the following statements:

    1. The seeds of Zea mays would germinate immediately after falling from the plant if favorable conditions of moisture, temperature and aeration are available

    2. Seed-coat dormancy is exhibited by

    Cassia and Gossypium

    Which of the statements given above is/are correct?

    1. 1 only

    2. 2 only

    3. Both 1 and 2

    4. Neither 1 nor 2

  2. Consider the following plants:

    1. Isoetes

    2. Marsilea

    3. Sagittaria

    4. Salvinia

    Which of the above are hydrophytes?

    1. 1 and 2

    2. 2, 3 and 4

    3. 1 and 3

    4. 1, 2, 3 and 4

  3. In angiosperms, the wall around the microspore tetrads is deposited with

    1. Callose

    2. Cellulose

    3. Pectocellu lose

    4. Sporopollenin

  4. In Oak tree, the pollination is brought about by

    1. Bats

    2. Insects

    3. Squirrels

    4. Wind

  5. Which one of the following chemical ions plays an important role in the growth of pollen tube

    1. Calcium

    2. Chlorine

    3. Magnesium

    4. Sulphate

  6. The pollen grains are usually surrounded by an in tine layer made up of

    1. Glycoprotein's

    2. Lipoproteins

    3. Lipids

    4. Polysaccharides

  7. Antipodal cells are absent in the embryo sac of

    1. Allium

    2. Fritillaria

    3. Polygonum

    4. Oenothera

  8. The major site of lipid synthesis in most cells is

    1. Cytoplasmic ribosome's

    2. Outer membrane of mitochondria

    3. Endoplasmic reticulum

    4. Golgi membranes

  9. Which one of the following enzymes is subject to allotter inhibition?

    1. Aconitase

    2. a-ketoglutarate dehydrogenase

    3. Citrate synthetase

    4. Phosphofructo-kinase

  10. To ensure that the transferred gene expresses in all tissues of plant, which of the following promoters should be used?

    1. Ribulose 1, 5-bisphosphate carboxylase small subunit gene

    2. Histone 3 gene

    3. Phosphoenal pyruvate carboxylase gene

    4. Cauliflower mosaic virus, 35 S RNA gene

  11. Determination of the order of bases in a DNA molecule making up the gene is known as the

    1. Gene probing

    2. Gene splicing

    3. Gene mapping

    4. Gene sequencing

  12. The successive nucleotides of RNA are covalently linked through

    1. Glycoside bonds

    2. Hydrogen bonds

    3. Phosphodiester bonds

    4. Peptide bonds

  13. Using tissue culture technique, the secondary metabolite shikonine is obtained from

    1. Cathranthus roseus

    2. Digitalis Lanata

    3. Lithospermum erythrorhizon

    4. Dioscorea deltoidea

  14. Match List (Scientists) with List II (Discoveries) and select the correct answer using the codes given below

    List-I List-II
    1. Nilsson Ehle and East, H

    2. Meselson, M and stahl, F

    3. Kornberg, A

    4. Avery, D T Mac Lead, C M and McCarty, M

    1. DNA as transforming principle

    2. Quantitative investigative

    3. Semi-conservative replication of DNA

    4. Discovery of DNA polymerase enzyme

    • A
    • B
    • C
    • D
      • 2
      • 3
      • 4
      • 1
      • 1
      • 3
      • 4
      • 2
      • 2
      • 4
      • 3
      • 1
      • 1
      • 4
      • 3
      • 2
  15. Flowers complete, actinomorphic with gynobasic disc, sepals 5 with valvate aestivation, petals 5 with imbricate aestivation, stamens indefinite, polyadeiphous, ovary superior, carpels 5 or more, syncarpous, multilocular ovules arranged on axile placenta ion and style single. In which family a plant of this description can be found?

    1. Annonaceae

    2. Magnoliaceae

    3. Malvaceae

    4. Rutaceae