Competitive Exams: Botany MCQs (Practice-Test 56 of 104)

  1. The micro-populations within a species population showing genetically fixed morphological variations in response to ecological factors are called

    1. Ecotypes

    2. Ecads

    3. Ecophenes

    4. Syntypes

  2. Which one of the following groups of algae shows characteristic photo chromatic adaptation?

    1. Brown algae

    2. Green algae

    3. Yellow-green algae

    4. Blue-green algae

  3. Which one of the following algae is typically terrestrial in nature?

    1. Lyngbya

    2. Fritschiella

    3. Volvox

    4. Polysiphonia

  4. Which one of the following species is obtained from per carp of schizocarp fruit marked with riles, grooves and bristles?

    1. Piper longum

    2. Cuminum cyminum

    3. Trigonells foenum-graecum

    4. Elettaria cardamomum

  5. Clove (Syzygium aromaticurn) is the

    1. Thin pod like capsules

    2. Elongated light brown fruits

    3. Dried unopened flower buds

    4. Dried stigmas and top of styles

  6. Which one of the following is the best method of estimating productivity of a submerged aquatic plant?

    1. Harvest method

    2. Chlorophyll content estimation

    3. Dark and light bottle method

    4. Leaf area index measurment

    • Assertion (A): The ratio of Net Primary Production to Gross Primary Production in a mature rain forest on yearly basis tends to be very low in comparison to that of a crop-field.
    • Reason (R): Communities with large baronesses or standing crops require so much autotrophic respiration for maintenance
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Necrotrophic pathogens enter plant cells by degrading plant cell wall polymer.
    • Reason (R): Necrotrophic pathogens produce a wide range of extra-cellular enzymes.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): A variety developed through pure line selection is characterized by complete phenotypic uniformity under varying environments.
    • Reason (R): A pure line variety is developed by self-pollination from a single homozygous plant.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Once plant cells have differentiated into specialized structures they cannot dedifferentiate.
    • Reason (R): Upon differentiation cells become complex in structure and specialized in function.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): DNA is found in the cytoplasm of prokaryotes.
    • Reason (R): DNA is not enclosed by nuclear membrane in a prokaryotic cell.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Anther culture is a popular technique to produce haploids for breeding programmes.
    • Reason (R): Haploid plants are highly fertile.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Nearly all studies of phytochrome have been made with pigments purified from etiolated seedlings.
    • Reason (R): Etiolated seedlings have long internodes.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): The replication of DNA starts with the formation of RNA primer of 8 − 10 nucleotides at a specific site on template strand of DN.
    • Reason (R): Okazaki fragments of DNA are formed by the enzyme DNA polymerase (s).
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): In plants tracheids are the most efficient means of water conduction.
    • Reason (R): Tracheids have bordered pits.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true