A plant with bulb, trimerous flowers, 6 stamens in two whorls belongs to a specific class in Bentham and Hooker's classification. The number of natural orders present in that class is

• 3

• 34

• 165

• 202

Study the following combinations.

I. Cymose infloresence - Epipetalous - Solanum

II. Homochlamydeous - Polyandrous - Allium

III. Axile placentation - Radical leaves - Smilax

IV. Zygomorphic - Deadelphous - Butea

The correct combination is

• I, II

• II, IV

• I, IV

• III, IV

143.

Ratio between number of stamens in nine male flowers and number of carpels in three female flowers in Euphorbia is

• 1 : 1

• 1 : 3

• 2 : 1

• 2 : 3

All given statements regarding cymose inflorescence are correct except

• main axis terminate in a flower

• development of flowers is basipetal

• opening of flowers is centrifugal

• unlimited growth of axis

The leaves of some plants contain crystals of calcium carbonate in epidermal cells, giving appearance that of bunch of grapes are called

• cystoliths

• sphaeraphides

• raphides

• otoliths

Which of the following feature cannot be considered to distinguish underground stem from a root?

• Presence of nodes and internodes

• Presence of axillary and terminal buds

• Absence of scale leaves and adventitious roots arising from nodes

• Presence of exogenous branches

Choose the correct option depicting the floral formula of the diagram given below

• Br$\oplus$$⚥$P_{3 + 3} A_{3 + 3} $\underline{\mathrm{G}}$₍₃₎

• Br$\oplus$$⚥$Epi_{5 - 7} K₍₅₎ C₅ A_($\infty$) $\underline{\mathrm{G}}$₍₅₎

• Ebr $\oplus$$⚥$K_{2 + 2} C₄ A_{2 + 4} $\underline{\mathrm{G}}$₍₂₎

• % $\oplus$$⚥$K₅ C₅ A_{7 + 3} $\underline{\mathrm{G}}$₍₁₎

Tendrils exhibit

• seismonasty

• geotropism

• heliotropism

• thigmotropism

Which of the following groups of plants are propagated through underground root?

• Pistia, Chrysanthemum and pineapple

• Ginger, potato, onion and zamikand

• Sweet potato, Asparagus, Tapioca and dahlia

• Bryophyllum and Kalanchoe

Artificial induction ofroots on stems before it is separated from the parent plant for propagation is called

• layering

• root-stem joint

• cutting

• plant tissue culture