Q. No.If the Bengal Tiger becomes extinct
1. Hyenas and wolves will become scars
2. The wild areas will be safe for man and domestic animals
3. Its gene pool will be lost forever
4. The population of beautiful animals like deers will get stabilized.
Which one of the following correctly represents an organism and its ecological niche?
(1) Vallisneria and pond
(2) Desert locust (Schistocerca) and desert
(3) Plant lice (aphids) and leaf
(4) Vultures and dense forest
In an experiment, freshly hatched larvae of an insect (Khapra beetle) were reared on a basal diet ( complete diet without cholesterol) with increasing amounts of cholesterols. Results obtained are shown in the graph given in the table:
The graph indicates that
(1) Cholesterol is an essential dietary requirement of Khapra beetle
(2) Growth of Khapra beetle is directly proportional to cholesterol concentration
(3) Cholesterol concentration of 2 ug/g is the optimum level.
(4) Growth of Khapra beetle is inhibited when cholesterol concentration exceeds 5ug/g diet.
Two opposite forces operate in the growth and development of every population. One of them is related to the ability to reproduce at a given rate. The force opposite to it is called
(1) Fecundity
(2) Environmental resistances
(3) Biotic control
(4) Mortality
One of the major difficulties in the biological control of insect pest is that
(1) the predator develops a preference for other diets and may itself become a pest
(2) the predator does not always survive when transferred to a new environment
(3) the method is less effective as compared with the use of insecticides
(4) the practical difficulty of introducing the predator to specific areas.
Which of the following statements is incorrect?
(1) Lichen, an association of fungus and algae is an example of mutualism
(2) Those epiphytes which use other plants for support only and not for water or food supply and are examples of commensalism.
(3) Sea-anemone on hermit-crab is an example of protocooperation
(4) Mutualism, protocooperation, commensalism cannot be included under symbiosis.
The growth curve of bacterial population in lab is plotted against time. What will be the shape of graph?
(1) Sigmoid
(2) Hyperbolic
(3) Ascending straight line
(4) Descending straight line
Bacteria, fungi, lower plants survive in adverse conditions by:
(1) diapause
(2) suspended growth
(3) migration
(4) formation of thick-walled spores
What are labelled phases A, B and C in given
sigmoidal growth curve?
A B C
(1) Stationary Log Lag
(2) Lag Stationary Log
(3) Log Lag Stationary
(4) Lag Log Stationary
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