Annual migration does not occur in the case of:
1. Salmon
2. Siberian crane
3. Salamander
4. Arctic tern
The population dynamics of a species is basically regulated by
1. Climate
2. Food supply
3. Competition between and within the species
4. All of the above
In a lake that undergoes thermal stratification, blooms of phytoplankton tend to occur
1. before thermal stratification
2. after thermal stratification
3. at the onset of thermal stratification
4. at the mid-phase of thermal stratification
Commensalism is an association of two species in which
1. one lives, attached to the other, without harming it
2. both organisms derive benefits from each other
3. one derives its nutrition from the other
4. none of the above
Some students, during a study, caught, marked and released 80 fishes in a pond. Later
100 fishes were caught at random. Among these 40 were found to be marked. What is
the approximate number of fishes in the pond?
1. 50
2. 100
3. 200
4. 4000
The sphere of living matter together with water, air and soil on the surface of earth is
called
1. atmosphere
2. hydrosphere
3. lithosphere
4. biosphere
Mutualism is found in
1. Hermit crab and sea anemone
2. Ox pecker and rhinoceros
3. Zoochlorellae and Hydra
4. E.coli and man.
July 11 is observed as:
1. World population day
2. No tobacco day
3. World environment day
4. World health day
Which one of the following is a matching pair of certain organism(s) and the kind of
association?
1. Shark and sucker fish - predation
2. Algae and fungi in lichens - mutualism
3. Orchids growing on trees - parasitism
4. Cuscuta (dodder) growing in other flowering plants - epiphytism
The Great Barrier Reef along the east coast of Australia can be categorised as
1. population
2. community
3. ecosystem
4. biome