221. Conclusion of Mendel’s work later became a:
(A) Scientific hypothesis
(B) Theory
(C) Scientific law
(D) Productive theory)
222. Starch is converted into maltose by:
(A) Diastase
(B) Invertase
(C) Maltase
(D) Amylase)
223. Breeders have developed new and better varieties of food items by using which technique?
(A) Pasteurization
(B) Hydroponic culture technique
(C) Genetic engineering)
(D) Biological control techniques
224. Co-enzyme is often formed from?
(A) Lipid
(B) Protein
(C) Inorganic ion
(D) Vitamin)
225. The concept that various organisms dominated this planet during various geological time periods and thus placing organisms in a time sequence came from the studies by?
(A) Environmental biologist
(B) Paleontologist)
(C) Marine biologist
(D) Social biologist
226. Normally, in the process of osmosis, the net flow of water molecules into or out of the cell depends upon differences in the?
(A) Concentration of water molecules inside and outside the cell
(B) Concentration of enzymes on either side of the cell membrane
(C) Rate of molecular motion on either side of the cell membrane
(D) None of these)
227. It is possible to date the rocks by comparing the amount of specific radioactive isotopes they contain. Which of the statements is correct in this respect?
(A) Older sediment layers have an equal amount of these radioactive isotopes as that of the young ones
(B) Older sediment layers have a lesser amount of these radioactive isotopes as that of the young ones.)
(C) Older sediment layers have a greater amount of these radioactive isotopes as that of the young ones
(D) Older sediment layers did not have these radioactive isotopes
228. Sodium ions are ‘pumped’ from a region of lower concentration to a region of higher concentration in the nerve cells of humans. This process is an example of:
(A) Diffusion
(B) Passive transport
(C) Osmosis
(D) Active transport)
229. An unbroken series of species arranged in an ancestor to descendant sequence with each later species having evolved from one that immediately preceded it is called?
(A) Biome
(B) Phyletic lineage)
(C) Community
(D) Population
230. Most cell membranes are composed principally of?
(A) DNA and protein
(B) Protein and Lipids)
(C) Protein and Chitin
(D) Protein and RNA
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