Competitive Exams: Botany MCQs (Practice-Test 52 of 104)

  1. Which one of the following gymnosperms is devoid of arch gonium?

    1. Pinus

    2. Ginkgo

    3. Genetum

    4. Cycas

  2. Which one of the bacteria is not connected with nitrogen fixation?

    1. Azotobacter

    2. Nitrosomonas

    3. Clostridium

    4. Rhizobium

  3. Consider the following statements:

    1. Anthoceros has isomorphic alternation of generations and saprophyte is green

    2. Riccia has heteromorphy alternation of generations and its saprophyte is non-green

    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

  4. Which one of the following pairs of plants bears sporangia with two different types of spores?

    1. Selaginella and Equisetum

    2. Equisetum and Pteridium

    3. Selaginella and Marselia

    4. Pteriodium and Marselia

  5. In Autocross, the sporangium tissue develops from

    1. Apothecium's

    2. Endothecium's

    3. Amphithecium

    4. Perithecium

  6. In Eusporangiate ferns, the sporangium is derived from a group of

    1. Apical meristems

    2. Lateral merstems

    3. Intercalary cells

    4. Surface cells of sporophyll

  7. Consider the following characteristic features of plants:

    1. Naked ovules

    2. Double fertilization

    3. Absence of tracheids

    4. Haploid endosperm

    Which of the above are present in the case of gymnosperms?

    1. 1 and 4

    2. 1 and 3

    3. 1 and 2

    4. 2 and 4

  8. In photosynthesis, during the operation of PS II, the cited P680 is rapidly photooxidised as it passes an electron

    1. Carotene

    2. Ferridoxin

    3. Phaeophytin

    4. Phycoerythrin

  9. Consider the following statements:

    1. PEP Carboxylase has a high specificity for carbon dioxide and it never picks up oxygen

    2. Kranz anatomy and C4 metabolism are found in only monocots of hot climates and not in dicots

    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

  10. Uncouples such as 2, 4-Dinitrophenol have no effect on

    1. Oxidative phosphorylation

    2. Photophosphorylation

    3. Substrate-level phosphorylation

    4. Respiratory-chain phosphorylation

  11. With reference to mass selection of crop plants, consider the following statements:

    1. Mass selection has been more commonly used for the improvement of cross-pollinated crops than the single plant selection

    2. The purpose of mass selection is to increase the frequency of superior genotypes in the population

    3. This method of breeding has been very effective in improving characters governed by many genes

    Which of the statements given above are correct?

    1. 1, 2 and 3

    2. 1 and 2

    3. 1 and 3

    4. 2 and 3

  12. In the mitochondrial genome of Neurospora crassa the genetic code UGA means

    1. Tryptophan

    2. Methiorne

    3. Isoleucine

    4. Termination/stop codon

  13. A shuttle vector is defined as

    1. A plasmid capable of replicating in one orgasm

    2. A plasmid capable of accepting only large DNA inserts

    3. A plasmid incapable of replicating in cells

    4. A plasmid capable of replicating in two different organisms

  14. The replication of a single stranded viral RNA is brought about by

    1. Reverse transcriptase

    2. RNA polymerase

    3. DNA ligase

    4. DNA primer

  15. Three point test cross is used for

    1. Gene transfer

    2. Gene regulation

    3. Gene conversion

    4. Gene mapping