Competitive Exams: Botany MCQs (Practice-Test 35 of 104)

  1. In oak, pollination is facilitated mainly by:

    1. Birds

    2. Droplets of rain

    3. Insects

    4. Wind

  2. Consider the following statements:

    1. All ferns are perennial and herbaceous.

    2. Most ferns are homophonous, but

    Marsileales and Salvineales are heterosporous.

    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

  3. Red drop and Emerson effect have proved the existence of:

    1. Light and dark reactions is photosynthesis

    2. Two distinct photo systems in photosynthesis

    3. The supply of electrons from oxygen evolving complex

    4. Electron transport from water to

    NADP + across thylakoids

  4. With reference to photosynthesis, what is the CF0-CF1 complex?

    1. ATP synthetase

    2. Ferredoxin-NADP reductase

    3. Cytochrome b6/f complex

    4. RuBP carboxylase

  5. With reference to photosynthesis in chloroplasts, consider the following statements:

    1. The reactions that break down water and produce oxygen are located on the lumen side of the thylakoid membrane, in granum areas.

    2. The molecules of ferredoxin-NADP reeducate that generate NADPH are located on the side of the membrane facing stroma.

    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

  6. Which one of the following statements is not correct?

    1. The magnesium atom in chlorophyll a carries the electrons involved in photosynthesis

    2. Cytochromes are intrinsic proteins of chloroplast's thylakiod membrane

    3. Ferredoxin has a large positive redox potential and tends to accept electrons

    4. The phytol tails of chlorophyll a and chlorophyll are hydrophobic

  7. Consider the following statements:

    1. The Pentose Phosphate Pathway supplies Erythrose-4-Phosphate which is the starting material the synthesis on lignin.

    2. The Pentose Phosphate pathway also occurs in plastids.

    3. NADPH is generated by the Pentose phosphate pathway

    Which of the statements given above are correct?

    1. 1 and 2 only

    2. 1 and 3 only

    3. 1 and 3 only

    4. 1, 2 and 3

  8. Which among the following substances have carbon skeletons made up of isoprene units?

    1. Alkaloids

    2. Peptones

    3. Steroids

    4. Tepenes

  9. Which one of the following statements is not correct?

    1. Roots produce gibberellins

    2. The casparian strips in roots are involved in controlling the types of minerals that eneter the xylem water starm

    3. Lateral roots are initiated by cells division in the endodermis

    4. When Rhizobium converts N2 into nitrogenous compounds that are released into the host cells, energy is supplied by sugars from the legume roots cells

  10. Ginger-Muller counter is used for

    1. Estimating chlorophyll concentration

    2. Measuring radioactivity

    3. Identifying phytochrome pigments

    4. Measuring the light absorption by chlorophyll

  11. Consider the following statements:

    1. Initiator tRNA binds to the ribosome small subunit even through no mRNA is present.

    2. During the elongation of protein chain, the bond between methionine and its tRNA in the P channel is broken by the enzymes located in the small subunit of ribosome.

    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

  12. With which of the following is Richmond-Lang effect associated?

    1. Stimulation of rosette plants to grow normal

    2. Inhibition of glycol sis by oxygen

    3. Inhibition of photosynthesis by oxygen

    4. Delay of senescence in detached leaves

  13. Dense clumping of chromosomes on one side with no chromatin material being seen in the rest of the nucleus is termed as

    1. Synapsis

    2. Synizesis

    3. Congress ion

    4. Synaptomeres

  14. The bulbosum technique used for the production of haploid barley was first given by

    1. Kasha and Kao

    2. Guha and Maheswari

    3. Sears and Kostoff

    4. Gupta and Srivastava

  15. When genotype of haploid pollen and diploid pistil determine incompatibility, it is known as

    1. Gametophytic self-incompatibility

    2. Sporophytic self-incompatibility

    3. Heteromorphic self-incompatibility

    4. Homomorphic self-incompatibility