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NCERT Solutions for Class 12 Biology Chapter 13
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NCERT Solutions for Class 12 Biology Chapter 13
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88 BIOLOGY, EXEMPLAR PROBLEMSCHAPTER 13
ORGANISMS AND POPULATIONS
MULTIPLE-CHOICE QUESTIONS
1. Autecology is the:
a. Relation of a population to its environment
b. Relation of an individual to its environment
c. Relation of a community to its environment
d. Relation of a biome to its environment
2. Ecotone is:
a. A polluted area
b. The bottom of a lake
c. A zone of transition between two communities
d. A zone of developing community
3. Biosphere is:
a. a component in the ecosystem
b. composed of the plants present in the soil
c. life in the outer space
d. composed of all living organisms present on earth which interact
with the physical environment
4. Ecological niche is:
a. the surface area of the ocean
b. an ecologically adapted zone
c. the physical position and functional role of a species within the
community
d. formed of all plants and animals living at the bottom of a lake
, U
O NIT II:
UNIT II: SSTRUCTURAL
RGANISMS TRUCTURAL O
AND POPULATIONS
ORGANISATION IN P
RGANISATION IN PLANTS AND A
LANTS AND ANIMAL
NIMALS 89
5. According to Allen’s Rule, the mammals from colder climates have:
a. shorter ears and longer limbs
b. longer ears and shorter limbs
c. longer ears and longer limbs
d. shorter ears and shorter limbs
6. Salt concentration (Salinity) of the sea measured in parts per
thousand is:
a. 10 – 15
b. 30 – 70
c. 0 –5
d. 30 – 35
7. Formation of tropical forests needs mean annual temperature and mean
annual precipitation as:
a. 18 – 25°C and 150 – 400 cm
b. 5 – 15°C and 50 – 100 cm
c. 30 – 50°C and 100 – 150 cm
d. 5 – 15°C and 100 – 200 cm
8. Which of the following forest plants controls the light conditions at the
ground?
a. Lianas and climbers
b. Shrubs
c. Tall trees
d. Herbs
9. What will happen to a well growing herbaceous plant in the forest if it is
transplanted outside the forest in a park?
a. It will grow normally
b. It will grow well because it is planted in the same locality
c. It may not survive because of change in its micro climate
d. It grows very well because the plant gets more sunlight
10. If a population of 50 Paramoecium present in a pool increases to 150
after an hour, what would be the growth rate of population?
a. 50 per hour
b. 200 per hour
c. 5 per hour
d. 100 per hour
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