Competitive Exams: Botany MCQs (Practice-Test 58 of 104)

  1. Which one of the following statements is correct?

    1. Deuterium is used less frequently in biochemistry than tritium because greater radiation precaution is required to be taken while using deuterium

    2. Tritium carbon-14 and phosphorous-32 are all beta particle emitters

    3. The transference of label from a tritium labeled substance to other hydrogen compounds never occurs

    4. Gamma radiation does not ionize the contents of cells but damages the tissue solely by virtue of the heating effect.

  2. Which of the following pairs are correctly matched?

      • Auxin
      • Dwarf rice
      • Gibberellin
      • Elongation
      • Cytikinin
      • Coconut milk
      • Abscisic acid
      • Early leaf fall

    Select the correct answer using the codes given below:

    1. 2, 3 and 4

    2. 1, 2 and 3

    3. 1, 2 and 4

    4. 1, 3 and 4

  3. The polar transport of auxin in stem segments in Volvos the movement of auxin from the

    1. Morphological apex towards the base

    2. Base towards the morphological apex

    3. Morphological apex towards the lateral

    4. Base towards the lateral branches

  4. Cresco graph was used to

    1. Investigate sleep movements of bean leaves

    2. Study the role of phytochrome in seed germination

    3. Record the progress of plant growth

    4. Distinguish between short day plants and long day plants

  5. The period of rapid starch formation and decrease in sugar in developing seeds is associated with a marked increase in

    1. Phosphorylase

    2. Phosphates

    3. Alpha amylase

    4. Hexokinase

  6. An important function of the synergies in the embryo sac is to

    1. Push the pollen tube into the egg

    2. Nourish the embryo

    3. Serve as the seat of pollen tube discharge

    4. Protect the egg form damage by the pollen tube

  7. The family boranthaceae is characterized by

    1. Ruminate endosperm

    2. Nuclear endosperm

    3. Composite endosperm

    4. Helobial endosperm

  8. Match List I contains the types of the embryo sac and List II the genera in which they were first found. Match the two lists and select the correct answer

    List-I List-II
    1. Monosoric 4 nucleate embryo sac

    2. Bisporic 8 nucleate embryo sac

    3. Tetrasporic 16 nucleate embryo

    4. Tetraspoic 8 nucleate embryo sec

    1. Oenothera

    2. Peperomia

    3. Fritillaria

    4. Endymion

    • A
    • B
    • C
    • D
      • 1
      • 4
      • 2
      • 3
      • 3
      • 2
      • 4
      • 1
      • 1
      • 2
      • 4
      • 3
      • 3
      • 4
      • 2
      • 1
  9. Pollinia occur in

    1. Orchidaceae

    2. Onagraceae

    3. Orobanchaceae

    4. Oxalidaceae

  10. Yucca is pollinated by a

    1. Fruit fly

    2. Butterfly

    3. Honeybee

    4. Moth

  11. Most of the phosphorus in the developing seeds is stored as

    1. Ergastic substances

    2. Phosphate

    3. Nucleic acids

    4. Phytic acid

  12. Stratification refers to a process in which seeds are subjected to a

    1. Low temperature treatment

    2. Hormonal spray

    3. High temperature treatment

    4. Strong mutagen sing chemical treatment

  13. Gametophyte self incompatibility does not differ from saprophytic self incompatibility in that

    1. There is co dominance of self incompatibility alleles

    2. Both give 50% functional. Pollen in pollinations on some other plants

    3. There is breakdown of incompatibility on induction of polyploidy

    4. There is complete failure of seed set on self pollination

  14. The photoreceptor regulating phototropism higher plants is called

    1. Phytochrome

    2. Blue/UV-A photoreceptor

    3. Cytochrome

    4. UV-B photoreceptor

  15. Polyploidy will exhibit polysomic inheritance, only if they

    1. Are allopolyploids

    2. Lack multivalent formation

    3. Are autopolyploid and form multivalent

    4. Are amphidiploids