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Plant Growth and Development

Multiple Choice Questions

151.

Masses of pollen grains, i.e., pollinia is found in

Gramineae
Solanaceae
Orchidaceae
Malvaceae

152.

Morphine, which is used as an analgesic is obtained from

Taxusbrevifolia
Berberisnilghiriensis
Cinchona officinalis
Pa paver somniferum

153.

Darwin’s finches are an excellent example of

Adaptive Radiation
Seasonal migration
Brood parasitism
Connecting links

154.

Vascular tissues in flowering plants develop from

Phellogen
Plerome
Periblem
Dermatogen

155.

A mature pollen grain of Pinus has

2 cells
3 cells
4 cells
5 cells

156.

Green potatoes are toxic due to

Phytoalexins
Solanin
Triazine
Hormones

157.

Which is a useful product of epidermal origin?

Saffron
Cotton Fibres
Clove
Jute

158.

A monocarpic plant is one, which

has only one carpel
Flowers once in a life-time
Produces only one seed
Produces only one fruit

159.
The rupture and fractionation do not usually occur in water column in vessel/tracheids during the ascent of sap because of

Lignified thick walls

Cohesion and adhesion

Weak gravitational pull

Transpiration pull

Cohesion and adhesion

The vertical conduction of water from root to arial part of a plant is called ascent of sap. The water molecules remain joined to each other due to a force of attraction called cohesion force. The attraction between water molecules and the walls of xylem is due to adhesion forces. These forces help to ensure the continuity of the water column in xylem.