Competitive Exams: Botany MCQs (Practice-Test 4 of 104)

    • Assertion (A): Polyspermy may bring about fertilization of synergies or antipodal.
    • Reason (R): The embryo sac is penetrated by more than one pollen tube.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R 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): Any individual diploid organism can have only two alleles.
    • Reason (R): The population as a whole contains many different alleles of gene.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R 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): Potato tubers do not sprout immediately after harvest.
    • Reason (R): Immediately after harvest, potato tubers contain high amount of abscises acid which prevents sprouting.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R 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 Ti plasmid of Agro bacterium tumefactions has been effectively used as a vector for gene transfer in plants.
    • Reason (R): Ti plasmids carry sites for insertion of foreign gene intended to be transferred.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R 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 group of three nucleotides is the fundamental coding unit and the code is read linearly from left to the right end.
    • Reason (R): The coding ratio estimated to be close to three is the evidence for the triplet codes.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R 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): Gene mapping is possible when crossing over occurs between homologous chromosomes.
    • Reason (R): Gene mapping shows the relative distance between genes on a chromosome.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R 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): Intercellular differentiation is the cause of intracellular differentiation.
    • Reason (R): Intercellular differentiation is the process of sequential reorganization which redistributes differential cells and triggers new intracellular differentiation.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R 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): When chromosomes are broken by exposure to high energy radiation such as X-ray, the resulting broken ends exhibit a pronounced tendency to stick to each other and fuse.
    • Reason (R): The broken ends resulting from irradiation does not contain telomere.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R 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): Even though municipal sewage contains a lot of biodegradable organic substances, its discharge into rivers makes the area uninhabitable for fish and other vegetation.
    • Reason (R): Sewage water also contains inorganic substances and pathogenic bacteria. Which normally is not a part of the aquatic ecosystem.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R 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 recombination frequencies and map distances do not correspond in large linkage maps.
    • Reason (R): Large map distances cannot be measured accurately due to the occurrence of multiple crossovers.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R 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): All our insectivorous plants are on the verge of extinction.
    • Reason (R): These plants are grown in green houses.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R 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): C4 plants are ‘high efficiency’ photosynthesizes.
    • Reason (R): These plants have high levels of photosynthesis per unit of water lost.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R 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): During stomata opening starch is degraded in the guard cells to soluble phosphorylated hexose's which are then converted to oxaloacetate, maltase, etc. Through glycol sis and TCA cycle.
    • Reason (R): As the guard cells contain chloroplasts, the starch, that is degraded, is synthesized from the photosynthetic products formed in the guard cells.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R 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): Oryza sativa is more efficient in photosynthesis than Zea mays.
    • Reason (R): The CO2-comperisation point of Oruza sativa is much higher than that of Zea mays.
    1. Both A and R are true and R is the correct explanation of A

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

    3. A is true but R is false

    4. A is false but R is true