Each environment can support a limited population depending upon its .... ..... [Manipur 2006]
67%
a) Biotic potential
0%
b) Carrying capacity
0%
c) Natality
33%
d) Reproductive potential
Q.2.
Humus is example of .... .... [D.P.M.T.1987]
50%
a) A fertilizer
50%
b) Component of soil structure
0%
c) Organic colloids
0%
d) Crystalloids
Q.3.
. Stages of hydrarch are (a) Marsh meadow stage (b) Reed swamp stage (c) Submerged plant stage (d) Phytoplankton stage (e) Submerged free floating stage. Identify the correct sequence Kerala 2007
50%
a) d, c, e, b, a
50%
b) c, e, a, b, d
0%
c) e, c, b, a, d
0%
d) d, e, c, b, a
Q.4.
Match the columns and find the correct combination .... .... [Kerala 2011]
a. Beers
p. Diapause
b. Snail
q. Hibernation
c. Zooplankton
r. Dormancy
d. Seeds
s. Aestivation
50%
a) a - r,b - s, c - p, d - q
50%
b) a - q,b - p, c- s, d - r
0%
c) a - q, b - s, c - p, d - r
0%
d) a - q, b - s, c - p, d – r
Q.5.
In autogenic succession .... .... [Kerala 2005]
0%
a) Community itself modifies its own environment thus causing its own replacement by new community
100%
b) Early dominance of heterotrophs
0%
c) Replacement of existing communities due to external conditions
0%
d) Early and continued dominance of autotrophic organisms
Q.6.
Insectivorous plants are adopted to soils .... .... [Manipal 1995]
0%
a) Rich in water
100%
b) Deficient in water
0%
c) Deficient in nitrogenous compounds
0%
d) Deficient in trace elements
Q.7.
Maximum quantity of humus occurs in .... .... [C.P.M.T.2003]
0%
a) Lowermost layer of soil
100%
b) Upper layer of soil
0%
c) Middle layer of soil
0%
d) Same everywhere
Q.8.
Match the columns and find the correct combination .... .... [Kerala 2008]
a. Camouflage
Dendrobates pumilio
b. Batesian mimicry
Horse-shoe bat
c. Warming colouration
Monarch butterfly
d. Echolocation
Praying mantis
100%
a) a - 2, b - 4, c - 3, d - 1
0%
b) a - 3, b - 4, c - 2, d - 1
0%
c) a - 4, b - 1, c -3, d - 2
0%
d) a - 4, b - 3, c - 1, d – 2
Q.9.
If green plants are removed from an aquarium, the fishes will .... .... [K.C.E.T. 1998]
100%
a) Die
0%
b) Increase in number
0%
c) Decreases in size
0%
d) Not be affected
Q.10.
Geometric representation of age structure is a characteristic of .... .... [C.B.S.E.2007]
100%
a) Biotic community
0%
b) Population
0%
c) Ecosystem
0%
d) Landscape
Q.11.
Humus is good for plant growth because .... .... [C.P.M.T.1991]
100%
a) It improves physical condition of soil
0%
b) It makes the soil porous
0%
c) It increase water holding and aeration of soil
0%
d) All the above
Q.12.
Waxy coating on the surface of floating leaves prevents .... .... [Odisha 2005]
0%
a) Respiration
0%
b) Photosynthesis
100%
c) Clogging of stomata
0%
d) Transpiration
Q.13.
In the population, rate of addition of new members is higher than the rate of individuals lost. it shows .... .... [A.I.I.M.S. 1997]
100%
a) Zero population growth
0%
b) Declined growth
0%
c) Exponential growth
0%
d) None of the above
Q.14.
Consider the following statements (a - d) each with one or two blanks a. Bears go into ----(1) during winter to cold weather b. A conical age pyramid with a broad base represents ----(3) human population c. A wasp pollinating a fig flower is an example of ---(4) d. An area with high levels of species richness is known as Find the correct fill up .... .... [C.B.S.E. Mains 2011]