biology Quiz

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Q1. Turpentine is obtained from

A. pines
B. cedrus
C. eucalyptus
D. taxus

Ans. A. pines
Exp.Turpentine (also called spirit of turpentine, oil of turpentine, wood turpentine and colloquially turps) is a fluid obtained by the distillation of resin from live trees, mainly pines. It is mainly used as a solvent and as a source of materials for organic synthesis.

Q2. The metal ion involved in Stomatal regulations is
A. Iron
B. Magnesium
C. Zinc
D. Potassium

Ans.D Potassium

Exp. Each stomata has two dumb-bell or kidney shaped cells (depending on the plant type) called guard cells surrounded by a few specialised epidermal cells called subsidiary cells. The opening and closing of stomatal aperture is regulated by turgidity of guard cells which is brought about by entry/exit of K+ ions.

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