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 

Subtopic:  Response of Organisms to Abiotic Factors (OLD NCERT) |
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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

Subtopic:  Population Interactions: Commensalism, Protocooperation & Mutualism |
 84%
From NCERT
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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

 61%
AIIMS - 2001
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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

Subtopic:  Introduction to Ecology |
 75%
AIIMS - 2001
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Mutualism is found in 

1. Hermit crab and sea anemone

2. Ox pecker and rhinoceros

3. Zoochlorellae and Hydra

4. E.coli and man.

Subtopic:  Population Interactions: Commensalism, Protocooperation & Mutualism |
AIIMS - 2001
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July 11 is observed as:

1. World population day

2. No tobacco day

3. World environment day

4. World health day

 63%
AIIMS - 2003
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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 

Subtopic:  Population Interactions: Commensalism, Protocooperation & Mutualism |
 88%
From NCERT
AIIMS - 2003
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The Great Barrier Reef along the east coast of Australia can be categorised as

1. population       

2. community

3. ecosystem       

4. biome

AIIMS - 2004
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If the Bengal Tiger becomes extinct

1. Hyenas and wolves will become scars

2. The wild areas will be safe for man and domestic animals

3. Its gene pool will be lost forever

4. The population of beautiful animals like deers will get stabilized. 

 64%
AIIMS - 2004
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Which one of the following correctly represents an organism and its ecological niche?

(1) Vallisneria and pond

(2) Desert locust (Schistocerca) and desert

(3) Plant lice (aphids) and leaf

(4) Vultures and dense forest

Subtopic:  Introduction to Ecology |
AIIMS - 2005
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