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Which one of the following plants shows vexillary aestivation and diadelphous stamens?
The last chromosome sequenced in Human Genome project was:
The Floral Diagram represents which one of the following families?
Pollen grains can be stored for several years in liquid nitrogen having a temperature of:
Which of the following pairs is of unicellular algae?
Arrange the following events of meiosis in a correct sequence: I. Crossing over II. Synapsis III. Terminalisation of chiasmata IV. Disappearance of nucleolus
The floral formula ⊕ ⚥ K(5) C(5) A5 G(2) is that of:
Root hairs develop from the region of:
Which one of the following is a xerophytic plant in which the stem is modified into a flat green and succulent structure:
Which of the following is not a stem modification?
Free-central placentation is found in?
When the margins of sepals or petals overlap one another without any particular direction, the condition is termed as:
Identify the correct set of statements: (a) The leaflets are modified into pointed hard thorns in Citrus and Bougainvillea. (b) Axillary buds form slender and spirally coiled tendrils in Cucumber and Pumpkin. (c) Stem is flattened and fleshy in Opuntia and modified to perform the function of leaves. (d) Rhizophora shows vertically upward growing roots that help to get oxygen for respiration. (e) Subaerially growing stems in grasses and strawberry help in vegetative propagation.
Plants which produce characteristic pneumatophores and show vivipary belong to:
In Angiosperms, pollen tubes liberate their male gametes into the:
Which of the following has proved helpful in preserving pollens as fossils?
Wind pollinated flowers are:
Diadelphous stamens are found in:
After karyogamy followed by meiosis, spores are produced exogenously in
Which of the following statements is incorrect regarding respiration?