Competitive Exams: Botany MCQs (Practice-Test 38 of 104)

  1. During zygotene stage of meiosis in a spore mother cell, a proteinceous structure which appears between homologous chromosomes is known as

    1. Histone complex

    2. Lysosomal complex

    3. Liposomal complex

    4. Synaptonemal complex

  2. Which one of the following is the carrier of cytoplasm male sterility factors in crop plants?

    1. Nuclear DNA

    2. RNA

    3. Chloroplast DNA

    4. Mitochondrial DNA

  3. Which one of the following is not a common feature of gametophyte selfincompatibility systems?

    1. Pollen is 3-celled

    2. Pistil is wet

    3. Rejection reaction occurs in the style

    4. In vitro germination of pollen is easy

  4. Match List I (Phenotypic segregation ration) with List II (Type of gene action) and select the correct answer using the codes given below the lists:

    List-I List-II
    1. 9: 6: 1

    2. 12: 3: 1

    3. 9: 3: 4

    4. 13: 3

    1. Duplicate gene action

    2. Supplementary gene action

    3. Inhibitory gene action

    4. Masking gene action

    5. Polymeric gene action

    • A
    • B
    • C
    • D
      • 3
      • 2
      • 1
      • 5
      • 5
      • 2
      • 1
      • 3
      • 5
      • 4
      • 2
      • 3
      • 3
      • 4
      • 2
      • 5
  5. Consider the following statements:

    1. The seeds of Shorea robusta remains viable only for a week or so.

    2. The seeds of Lens esculenta can remain viable for several years

    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

  6. Nucellus in fertilized ovuled is known as:

    1. Perisperm

    2. Endothecium

    3. Perithecium

    4. Epistase

  7. Which one of the following pairs is not correctly matched?

      • Primary endosperm nucleus
      • Fusion between sperm and polar nuclei
      • Helobial endosperm
      • Successive nuclear division is followed by cells wall formation
      • Storage proteins in endosperm
      • Globulins and albumins
      • Endosperm cell well
      • Mannans and xyloglucans
  8. Most reactions of fatty acid synthesis occur in

    1. The cytosol, the mitochondrion, the plastid and the E. R.

    2. The mitocondrian, the plastid and the ER.

    3. The glyoxysome, the mitochondrion and the E. R.

    4. The plastid only

  9. Match List I (Region) with List II (Contribution to) and select the correct answer using the codes given below the lists:

    List-I (Region) List-II (Contribution)
    1. Apical cells of 2-celled embryo

    2. Basal cells of 2-celled embryo

    3. Torpedo stage embryo

    4. Globular embryo

    1. Emergence of cotyledons

    2. Differentiation of root and shoot

    3. Root apex and suspensor

    4. Bulk of the embryo proper

    • A
    • B
    • C
    • D
      • 1
      • 2
      • 3
      • 4
      • 1
      • 3
      • 2
      • 4
      • 4
      • 2
      • 3
      • 1
      • 4
      • 3
      • 2
      • 1
  10. With reference to the ‘embryonal suspensor’ which one of the following statements is not correct?

    1. It serves as a conduit for nutrients and growth factors from the maternal tissue to the embryo

    2. It is highly polyploid and polytene

    3. It persists even during post-embryonic phase

    4. It begins to senesce at torpedo stage of embryo

  11. With reference to the pollination stage in angiosperms, consider the following statements:

    1. Pollen grains become dehydrated.

    2. Antipodals degenerate.

    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

  12. Consider the following statements:

    1. Cucurbits are monoecious plants.

    2. In mango, neuter, male and female flowers occur together.

    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

  13. Which one of the following statements is not cottect?

    1. In corn, the mature seed is exalbuminous

    2. In orchids, the embryo has no cotyledons

    3. In corn, the embryo contains young leaves while in the seed

    4. In peach, the fruit is drupe

  14. Which one of the following disease is caused by fluoride in drinking water?

    1. Lung cancer

    2. Liver disorder

    3. Knock knee syndrome

    4. Cardiomyopthy

  15. With reference to the introduction of plant disease into India from other countries, consider the following pairs:

      • Bunchy top of banana
      • Ceylon (Sri Lanka)
      • Potato tuber moth
      • Italy
      • Flag sumut of wheat
      • Fiji

    Which of the above pairs is/are correctly matched?

    1. 1 and 2 only

    2. 2 only

    3. 1 and 3 only

    4. 1, 2 and 3