Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?

(1) Mutualism

(2) Predation

(3) Resource partitioning

(4) Competitive release

Subtopic:  Population Interactions: Competition |
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Amensalism can be represented as:

(1) Species A (-) : Species B (-)

(2) Species A (+) : Species B (0)

(3) Species A (-) : Species B (0)

(4) Species A (+) : Species B (+)

Subtopic:  Population Interactions: Amensalism |
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In the exponential growth equation Nt =N0ert, e represents :

1. The base of natural logarithms 

2. The base of geometric logarithms

3. The base of number logarithms

4. The base of exponential logarithms

Subtopic:  Population: Exponential Growth Model |
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Match List-I with List-II

List-I List-II
(a) Allen's Rule (i) Kangaroo rat
(b) Physiological adaptation (ii) Desert lizard
(c) Behavioural adaptation (iii) Marine fish at depth
(d) Biochemical adaptation (iv) Polar seal

Choose the correct answer from the options given below.

  (a) (b) (c) (d)
1. (iv) (i) (ii) (iii)
2.  (iv) (iii) (ii) (i)
3. (iv) (ii) (iii) (i)
4. (iv) (i) (iii) (ii)
Subtopic:  Adaptations |
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Assertion (A) :

A person goes to high altitude and experiences 'altitude sickness' with symptoms like breathing difficulty and heart palpitations.

Reason (R) :

Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen.

In the light of the above statements, choose the correct answer from the options given below.

1. (A) is true but (R) is false

2. (A) is false but (R) is true

3. Both (A) and (R) are true and (R) is the correct explanation of (A)

4. Both (A) and (R) are true but (R) is not the correct explanation of (A)

Subtopic:  Adaptations |
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Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their:

1. Growth response

2. Defence action

3. Effect on reproduction

4. Nutritive value

Subtopic:  Response of Organisms to Abiotic Factors |
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Which of the following is not an attribute of a population?

1.  Natality

2.  Mortality

3.  Species interaction

4.  Sex ratio

Subtopic:  Population Dynamic |
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The process of growth is maximum during:

1. Lag phase

2. Senescence

3. Dormancy

4. Log phase

Subtopic:  Population: Exponential Growth Model |
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Match the items in Column-I with those in Column-II :

            Column I               Column II

(a) Herbivores-Plants      (i) Commensalism

(b) Mycorrhiza-Plants      (ii) Mutualism

(c) Sheep-Cattle             (iii) Predation

(d) Orchid-Tree              (iv) Competition

Select the correct option from following :

1. (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)

2. (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)

3. (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

4. (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)

Subtopic:  Population Interactions: Competition | Population Interactions: Predation | Population Interactions: Commensalism, Protocooperation & Mutualism |
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The impact of immigration on population density is:-

1. Negative

2. Both positive and negative

3. Neutralized by natality

4. Positive

Subtopic:  Population Characters: Density | Population Characters: Natality & Mortality |
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