ORGANISMS AND POPULATIONS
2016 MARCH
1.
a)
Population interactions may be beneficial or not. Write any three interactions
in detail. (Scores:
3)
OR
(b) Organisms are influenced by biotic and abiotic factors. Write
an account of any three abiotic environmental factors.
2016 SAY
1.
Population growth may be exponential or logistic.
Differentiate between them. (Scores:
2)
2.
Plants are adapted to grow in different habitats.
Name any four adaptations of plants in desert habitat. (Scores: 2)
MARCH 2017
1. In a given habitat. the maximum number
possible for a species is called ……………………. of that species in that habitat. (Score:
1)
2. (A) Different types of population
interaction has been observed in a population.
Write the types of interaction observed
among the following species:
Species A Species B Type of Interaction
Orchid Ophrys Bees …………………
Cattle Cattle
Egret …………………
Sea Anemone Clown Fish …………………
Ticks Dogs …………………
Cuscuta Hedge
Plant …………………
Tiger Deer ………………… (Scores: ½ X
6 = 3)
OR
(B)
Organisms other than human beings manage or adapt to stressful conditions by
adopting different mechanisms. Explain
any three mechanisms adopted by them to maintain the internal environment. (Scores: 3)
MARCH 2018
1.
Under
unfavourable conditions many zooplanktons species in lakes and Ponds are known
to enter a stage of suspended development. Name that stage.
2.
The following
graph shows two types of pollution growth curves.
a.
Name the
growth curves.
b.
What does
K stand for?
answer keys for the questions
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