1.

The mobility of charge carriers increases with

• increase in the average collision time
• increase in the electric field
• increase in the mass of the charge carriers
• decrease in the charge of the mobile carriers

2.

Which of the following statements is wrong?

• Pollen grains remain viable for several months because their outer covering is made of sporopollenin
• No enzyme can degrade sporopollenin
• Pollen grains are well represented in fossil strata due to sporopollenin
• Pollen wall has cavities containing proteins

3.

What is the shape and magnetic nature of permanganate ion ?

• Pyramidal diamagnetic
• Tetrahedral, diamagnetic
• Tetrahedral, paramagnetic
• Planar, paramagnetic

4.

Which one of the following alkylbromides undergoes most rapid solvolysis in methanol solution to give corresponding methyl ether?

5.

Taxonomic hierarchy refers to

• stepwise arrangement of all tegories for classification of plants and animal
• a group of senior taxonomists who decide the nomenclature of plants and animals
• a list of botanists or zoologists who have worked on taxonomy of a species or group
• classification of a species based on fossil record

6.

Phagocytosis and pinocytosis are collectively termed as

• endocytosis
• suspension feeding
• omnivores
• mucous trap