1661. From ecological point of view human beings are taken as :

A. Decomposer
B. Consumers *
C. Producers
D. All of these

1662. The major cause of land pollution is :

A. Pesticides
B. Chemical fertilizers
C. Insecticides
D. All of these *

1663. The sharp-bitter taste of unripe fruits is due to high concentration of :

A. Phenolic compounds
B. Volatile compounds
C. Organic acids *
D. Starch

1664. The use of antibiotic is avery effective way of killing disease causing bacteria . Sometime people dont finish all of their pills. This can result in :

A. Some bacter left unkilled
B. Production of more bacteria
C. Bacteria becoming sensitive anitbiotics
D. Bacteria becoming resistant to antibiotics *

1665. Flesh eaters are called :

A. Omnivores
B. Carnivores
C. Herbivores
D. Scavengers *

1666. Chromosomes are made up of :

A. DNA only
B. DNA and RNA
C. Proteins only
D. DNA, RNA and Proteins *

1667. Plants can be made disease resistant by :

A. Heat treatment
B. Hormone treatment
C. Colchicine treatment
D. Breeding with their wild relatives *

1668. Important ingredient used in Vicks vapor rub is obtained from the plant ?

A. Cinnamomum camphora *
B. Cinsmomum zelamicum
C. Curaima longa
D. All of these

1669. Which of the following is both endocrine and exocrine gland :

A. Thyroid
B. Pancreases *
C. Parathroid
D. All of these

1670. The process by which small amount of impurities are added into a semi conduction is called :

A. Addition
B. Conduction
C. Doping *
D. Insulating