316: Decomposition of organic matter is due to:
(a) Virus
(b) Fungi
(c) Bacteria
(d) None of these
317: King Cobra is the only snake that makes its own nest. Why does it make its nest?
(a) It is a snake-eater and the nest helps attract other snakes
(b) It is a viviparous snake and needs a nest to give birth to its offspring
(c) It is an oviparous snake and lays its eggs in the nest and guards the nest until they are hatched
(d) It is a large, cold blooded animal and needs a nest to hibernate in the cold season
Explanation:
King Cobra's "claim to fame" is the fact that they are the only snake to construct a nest for the sole purpose of laying their eggs. A King Cobra Nest is constructed by the female typically from rotten leaves and vegetation. The female king Cobra will loop her coils over loose debris and drag the material to create her nest. In most cases, a Cobra nest is nothing more then a simple pile of leaves mounded above the ground where she will lay between 40 and 60 eggs. In some cases however, maybe due to experience, the female actually constructs a lower "Egg Chamber", with an upper area for her to lay and incubate. King Cobra eggs incubate after 65 to 80 days.
318: A radioactive substance has a half-life of four months. Three-fourth of the substance would decay in
(a) 3 months
(b) 4 months
(c) 8 months
(d) 12 months
319: Flood hit areas are to be immediately given medical cover. Which of the following is the most appropriate step?
(a) BCG injection
(b) Inoculation against Cholera
(c) Smallpox vaccination
(d) None of these
320: The growth of seedling plants after transplantation will not always be proper because:
(a) New soil may not contain the required minerals
(b) During transplantation root hairs get damaged
(c) Roots cannot penetrate deep into the soil
(d) Of all factors stated above