CSIR NET JRF: Botany MCQs (Practice-Test 28 of 104)

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  1. Plants normally flowering in winter remain vegetative in summer even if they are kept at winter temperature because

    1. Transpiration rate becomes very high during summer

    2. Laws of limiting factors are applicable in summer

    3. Pollination fails to take place in summer

    4. They do not get the required daylength during summer

  2. In nature, the orchid seeds germinate only in association With

    1. Myxomycetes

    2. Mycorrhiza

    3. Blue green algae

    4. Actinomycetes

  3. In vivipary type of seed germination, the seeds undergo

    1. Twelve months of resting period

    2. Six months of resting period

    3. Three months of resting period

    4. No resting period

  4. The outgrowth of the funicle is called

    1. Aril

    2. Caruncle

    3. Micropyle

    4. Strophiole

  5. Cycas is vegetative propagated by

    1. Corms

    2. Bulbs

    3. Bulbils

    4. Suckers

  6. Pollinium is present in

    1. Ficus

    2. Litchi

    3. Yucca

    4. Calotropis

  7. The exine of mature pollen grain is composed chiefly

    1. Lipids

    2. Cellulose

    3. Pectocellulose

    4. Sporopollenin

  8. During fertilization, the pollen tube discharges its consents in the vicinity of the

    1. Central cell

    2. Egg

    3. Micropyle

    4. Synergid

  9. Pollination in Ficus is

    1. Anemophilous

    2. Entomophilous

    3. Ornithophilous

    4. Cheiropterophilous

  10. Gynobasic style is characteristic feature of the family

    1. Rosaceae

    2. Orchidaceae

    3. Labiatae

    4. Cucurbitaceae

  11. In wheat, the first division of the zygote is

    1. Transverse

    2. Vertical

    3. Variable

    4. Oblique

  12. Consider the following families:

    1. Orchidaceae

    2. Potostmaceae

    3. Trapaceae

    In which of these the endosperm, a nutritive tissue, is NOT formed?

    1. 1 only

    2. 2 only

    3. 2 and 3

    4. 1, 2 and 3

  13. Small amount of nucleolus persisting in the mature seed is known as

    1. Caruncle

    2. Endosperm

    3. Perisperm

    4. Ruminate endosperm

  14. Polyembryony is a predominant feature in the species of

    1. Mangifera

    2. Opunitia

    3. Eugenia

    4. Citrus

  15. Dormancy caused by seed coat impermeability to water and gases can be broken by

    1. Stratification

    2. Scarification

    3. Low temperature

    4. Abscises acid

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