Maharashtra PSC Exam: Botany MCQs (Practice_Test 24 of 104)

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    • Assertion (A) : In plants, site of action of ethylene is close to its site of synthesis.
    • Reason (R) : Ethylene is insufficiently soluble in water to be transported in the form of aqueous solution.
    1. Both A and R are true & 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) : Plants grow quicker during day than during night.
    • Reason (R) : The food which is essential for growth is synthesized by the green plants only in the presence of sunlight.
    1. Both A and R are true & 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) : C14 isotope is more widely used in biochemical studies than C11 isotope.
    • Reason (R) : C14 isotope is radioactive and found in nature.
    1. Both A and R are true & 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) : In Zn deficient plants, resupply of Zn increases auxin content.
    • Reason (R) : Zn is essential for the synthesis of auxin.
    1. Both A and R are true & 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) : In summer months, most of the plants show mid day closure of stomata.
    • Reason (R) : The rate of absorption of water increases with the increase in temperature.
    1. Both A and R are true & 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) : If thylakoids isolated from chloroplasts are exposed to light in the presence of CO2 and H2O, hexose՚s are not formed.
    • Reason (R) : Carbon assimilation is a dark reaction and does not take place in light.
    1. Both A and R are true & 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) : In woody plants growing in temperate regions, the resumption of cambial activity in the spring is related to the new growth from buds.
    • Reason (R) : The initial stimulation of cambial activity is related to the formation and distribution of growth hormones in the spring.
    1. Both A and R are true & 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) : Dormancy of seed is an epigenetic trait.
    • Reason (R) : Dormant seeds can be induced to germinate by manipulating the environmental conditions around the seed.
    1. Both A and R are true & 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) : Alloploidy has led to the evolution of many crop plants.
    • Reason (R) : Alloploidy leads to the pairing of homologous chromosomes resulting in fertile hybrids.
    1. Both A and R are true & 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) : In the study of DNA analysis for biosystematics applications, the chromatin values are estimated.
    • Reason (R) : Morphologically similar organisms appear to have similar amounts of DNA in their genome.
    1. Both A and R are true & 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 pollen wall proteins are contributed by the two generations in the life cycle of a flowering plant.
    • Reason (R) : The exine proteins are of saprophytic origin and the in tine proteins are of gametophyte origin.
    1. Both A and R are true & 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 stiffness and rigidity of wood is due to the presence of cellulose, hemicelluloses and lignin.
    • Reason (R) : The degree of stiffness depends upon the amount of cellulose in the cell wall.
    1. Both A and R are true & 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) : RuBP carboxyl՚s is the most abundant protein on earth.
    • Reason (R) : RuBP carboxyl՚s can constitute up to 30 percent of the protein in a leaf.
    1. Both A and R are true & 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) : Triple dwarf mexican wheat cultivar ‘Sonoar 64’ was introduced in India from outside:
    • Reason (R) : Dwarfness increases the productivity.
    1. Both A and R are true & 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) : Male trees of Ginkgo biloba are not preferred in gardens.
    • Reason (R) : Their seeds contain Butyric
    Acid, which upon decomposition emits foul smell like rancid butter.
    1. Both A and R are true & 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

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