NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Botany MCQs (Practice_Test 28 of 104)
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- Plants normally flowering in winter remain vegetative in summer even if they are kept at winter temperature because
- Transpiration rate becomes very high during summer
- Laws of limiting factors are applicable in summer
- Pollination fails to take place in summer
- They do not get the required daylength during summer
- In nature, the orchid seeds germinate only in association With
- Myxomycetes
- Mycorrhiza
- Blue green algae
- Actinomycetes
- In vivipary type of seed germination, the seeds undergo
- Twelve months of resting period
- Six months of resting period
- Three months of resting period
- No resting period
- The outgrowth of the funicle is called
- Aril
- Caruncle
- Micropyle
- Strophiole
- Cycas is vegetative propagated by
- Corms
- Bulbs
- Bulbils
- Suckers
- Pollinium is present in
- Ficus
- Litchi
- Yucca
- Calotropis
- The exine of mature pollen grain is composed chiefly
- Lipids
- Cellulose
- Pectocellulose
- Sporopollenin
- During fertilization, the pollen tube discharges its consents in the vicinity of the
- Central cell
- Egg
- Micropyle
- Synergid
- Pollination in Ficus is
- Anemophilous
- Entomophilous
- Ornithophilous
- Cheiropterophilous
- Gynobasic style is characteristic feature of the family
- Rosaceae
- Orchidaceae
- Labiatae
- Cucurbitaceae
- In wheat, the first division of the zygote is
- Transverse
- Vertical
- Variable
- Oblique
- Consider the following families:
- Orchidaceae
- Potostmaceae
- Trapaceae
- In which of these the endosperm, a nutritive tissue, is NOT formed?
- 1 only
- 2 only
- 2 and 3
- 1,2 and 3
- Small amount of nucleolus persisting in the mature seed is known as
- Caruncle
- Endosperm
- Perisperm
- Ruminate endosperm
- Polyembryony is a predominant feature in the species of
- Mangifera
- Opunitia
- Eugenia
- Citrus
- Dormancy caused by seed coat impermeability to water and gases can be broken by
- Stratification
- Scarification
- Low temperature
- Abscises acid