Competitive Exams: Botany MCQs (Practice-Test 19 of 104)

  1. Regarding the mineral nutrition of plants, which one of the following statements is correct?

    1. The availability of iron to plants decrease with the increase of acidity of the soil

    2. The presence of CO2 dissolved in the soil water reduces the solubility of carbonates of lime in it

    3. Molybdenum is a constituent of nitrate reductasesystem

    4. Sulphur is a constituent of phenylalanine

  2. Which one of the following types of organisms causes the disease Potato Witches broom?

    1. Virus

    2. Myceplasma

    3. Fungus

    4. Bacteria

  3. Which one of the following statements regarding photosynthesis is not correct?

    1. Compounds with large positive redox potential tend to donate electrons

    2. Chlorophyll a and chlorophyll b have phytol tails which are hydrophobic

    3. Cyclic electron transport permits the production of extra ATP without the synthesis of NADPH or the production of free oxygen

    4. Crassulacean acid metabolism is present in the plants of Cucurbitaceac and Labiatae

  4. 34. Which one of the following is the correct order of retentive capacity of clay micelle particles for cations in the soil?

    1. H + > K + > Ca + + > Mg + +

    2. K + > H + > Mg + + > Ca + +

    3. Mg + + > Ca + + > K + > H +

    4. H + Ca + + > Mg + + > K +

  5. Consider the following statements:

    1. In Pteridophytes, the phloem lacks companion cells

    2. The xylem lacks vessels in majority of Pteridophytes

    3. Heterosporous Pteridophytes have inconspicuous gametophytes

    4. Water is essential for fertilization in

    Pteridophytes

    Which of these statements are correct?

    1. 1, 2, 3 and 4

    2. 2, 3 and 4

    3. 1 and 3

    4. 1, 2 and 4

  6. Which one of the following bacteria reduces nitrate to gaseous nitrogen?

    1. Azospirillum

    2. Nitrosomonas

    3. Nitrococcus

    4. Pseudomonas

  7. The class of seeds which must maintain a relatively high moisture content in order to remain viable are known as

    1. Orthodox seeds

    2. Recalcitrant seeds

    3. labyrinth seeds

    4. Ex-albumirious seeds

  8. Which one of the following statements is not correct regarding vivipary?

    1. Seeds germinate within the fruit while still attached to the mother plant

    2. It usually occurs under highly saline conditions

    3. It occurs in the mangrove plants

    4. It involves a dormancy period for the seed

  9. Which of the following cells divide to form two unequal cells?

    1. Microspore mother cell

    2. Microspore

    3. Megaspore mother cell

    4. Megaspore

  10. Consider the following fatty acids:

    1. Linolenic acid

    2. Oleic acid

    3. Palmitic acid

    4. Stearic acid

    Which of these is/are unsaturated fatty acids?

    1. 1 only

    2. 1 and 2

    3. 3 and 4

    4. 2, 3 and 4

  11. Which one of the following statements is not correct regarding vegetative propagation?

    1. Vegetative propagation produces clonal population

    2. Micro propagation is the fastest technique of vegetative propagation

    3. Vegetative propagation can go on round the year

    4. Vegetative propagation helps to eliminate the virus

  12. In which one of the following plants is the embryo sac devoid of the synergids?

    1. Oenothera sp.

    2. Opunitia sp.

    3. Plumbago sp.

    4. Najas sp.

  13. Filiform apparatus is found in the

    1. Egg

    2. Suspensor

    3. Endosperm

    4. Synergids

  14. Consider the following statements regarding the pair growth substances:

    1. Cytokines make dormant buds active

    2. The richest concentrations of cytokines generally occur in endosperm

    3. Ethylene is involved in the formation of parenchyma in submerged roots and stems

    4. Gibberellins are involved in the break of seed dormancy

    Which of these are correct?

    1. 1, 2, 3 and 4

    2. 2, 3 and 4

    3. 1 and 4

    4. 1, 2 and 3

  15. Stigma is always rough and sticky in

    1. Entomophilous flowers

    2. Anemophilous flowers

    3. Hydrophilous flowers

    4. Zoophilous flowers