Competitive Exams: Botany MCQs (Practice-Test 82 of 104)

  1. Changes in transcription after linking the cloned DNA of the putative promoter/enhancer region to cloned DNA of the coding region of an unrelated gene, can be measured rapidly with a high degree of sensitivity using

    1. Transgenic technology

    2. Reporter gene technology

    3. CDNA technology

    4. Gene transfer technology

  2. Internal phosphodiester bond in a nucleic acid molecule is hydrolyzed by

    1. Exonuclease

    2. End nuclease

    3. DNA polymerase

    4. Deoxyribonucleic

  3. The proof-reading during replication of a DNA molecule to eliminate a wrong in the elongating strand is brought about by

    1. The 3'-exonuclease activity of DNA polymerase I and III

    2. The 3-endonuclease activity of DNA polymerase I and III

    3. The 5 − 3' exonuclease activity of DNA polymerase II

    4. RNA polymerase

  4. The process, which involves the recombination of genetic material between bacteria and virus as result of the transfer of extra cellular pieces of DNA that are taken up by a living bacteria, is known as

    1. Sexduction

    2. Transformation

    3. Conjugation

    4. Transduction

  5. Which one of the following statements is correct? Crossing over with the inversion loop of

    1. Heterozygote per centric inversion produces duplication and deficiency

    2. Heterozygote pen centric inversion produces digenetic bridge and eccentric fragments

    3. Heterozygote Para centric inversion produces all the normal gametes

    4. Heterozygote Para centric inversion produces dysenteric bridge and acerbic fragments

  6. Which of the following are required for the development of hybrid rice seed production?

    1. CMS line

    2. Maintainer

    3. Restorer

    4. Inbred line

    Select the correct answer using the codes given below:

    1. 1, 2 and 3

    2. 2 and 4

    3. 1 and 3

    4. 1, 2, 3 and 4

  7. Besides the nucleus, which of the following cell organelles play an important role in hybrid vigor?

    1. Lysosome

    2. Mitochondria

    3. Endoplasmic reticulum

    4. Plastid

    Select the correct answer using the codes given below:

    1. l and 2

    2. l and 4

    3. 2 and 3

    4. 2 and 4

  8. Apoptosis is

    1. Necrotic death of a cell

    2. Programmed death of a cell

    3. Shrinking of apoplast and aging process

    4. A process of shedding leaves

  9. During senescence of a plant

    1. The plant displays sequential senescence of the leave

    2. Metabolites like carbohydrates, proteins etc. Are transported from young leaves to the aging leaves

    3. Metabolites like carbohydrates, proteins etc. Are trans. Ported out of the aging leaves to the young leaves

    4. Secondary plant products accumulate in the tissues are organs during aging

  10. Which one of the following is a causal agent of wart disease of potato?

    1. Synchytrium and endobioticum

    2. Plasmodiophora brassicae

    3. Spongospora subterranea

    4. Pseudomonas solanacearum

  11. Citrus canker is caused by

    1. Alter aria citric

    2. Xanthamonas citric

    3. Diaporthe citric

    4. Phytophthora citrophthroa

  12. Which one of the following fungi has been found useful in the biological control of plant diseases?

    1. Penicillium notatum

    2. Phytophthora parasitica

    3. Trichoderma viride

    4. Mucor mucedo

  13. Match List I with List II and select the correct answer using the codes given below the fists:

    List-I List-II
    1. Tectona

    2. Eucalyptus

    3. Truiploid

    4. Cyanphyceae

    1. Endosperm culture

    2. Biofertilizer

    3. Oil

    4. Timber

    • A
    • B
    • C
    • D
      • 4
      • 3
      • 2
      • 1
      • 2
      • 3
      • 1
      • 4
      • 3
      • 2
      • 1
      • 4
      • 4
      • 3
      • 1
      • 2
  14. The chemical substance Toxol is said to have curative blue for malignant tumor. It is obtained from the

    1. Bark of the stem of Taxus sp.

    2. Root of Taxus sp.

    3. Shoots of Taxodium sp.

    4. Roots and fruits of Taxodium sp.

  15. Henna is obtained from the leaves of

    1. Lawsonia

    2. Indigofera

    3. Haematoxylon

    4. Pterocaipus