18957.Individuals of a species which occur in a particular area constitute
Population
Fauna
Flora
Flora and Fauna
18958.Competition is severe in a population that has a distribution which is
Random
Uniform
Irregular
Non-random
18959.Consider the following four conditions (a - d) and select the correct pair of them as adaptation to environment in desert lizards.The conditions:
(a) Burrowing in soil to escape high temperature
(b) Losing heat rapidly from the body during high temperature
(c) Bask in sun when temperature is low
(d) Insulating body due to thick fatty dermis
(a) Burrowing in soil to escape high temperature
(b) Losing heat rapidly from the body during high temperature
(c) Bask in sun when temperature is low
(d) Insulating body due to thick fatty dermis
(a), (b)
(c), (d)
(a), (c)
(b), (d)
18960.In a population, if the rate of addition of new members is higher than the rate of individuals lost, it shows
Exponential growth
Declined growth
Zero population growth
none of these
18962.In an ecosystem Biotic factors affect the survival of an organism in that ecosystem. They include
competition for food and water
competition for shelter
co-operation to help find food
All of these
18964.Insectivorous plants are adopted to soils
Deficient in nitrogenous compounds
Deficient in water
Rich in water
Deficient in trace elements
18965.The role of an organism in the ecological system is known as
Niche
Habitat
Herbivory
Interaction
18966.Information about birth rate, death rate, sex ratio, age distribution etc. of a population is obtained from
Mortality rate
Life table
Natality table
Both (A) and (C)
18967.Large Woody Vines are more commonly found in
Alpine forests
Temperate forests
Mangroves
Tropical rainforests
18968.Group of interbreeding organisms found in a particular area is
population
community
tribe
density
18969.Pheromones, the chemical messengers produced by certain exocrine glands of skin, affect
Skin color
Breast
Genitalia
Mutual behaviour of members of a species
18970.According to National Population Policy, the marriageable age for girls has been raised in India from 15 years to
19
18
17
16
18975.Select the correct statement
Morphine is often given to a person who has undergone surgery as a pain killer
Chewing tobacco lowers blood pressure and heart rate
Cocaine is given to patients after surgery as it stimulates recovery
Barbiturates when given to criminals make them tell the truth
18976.Each environment supports a limited population depending upon its
Biotic potential
Carrying capacity
Natality
Reproductive potential