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