Saturday, March 9, 2019

Organisms and populations: Previous Year Questions Part 3

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?

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