The impact of immigration on population density is:-

1. Negative

2. Both positive and negative

3. Neutralized by natality

4. Positive

Which one of the following is most appropriately defined -

1. Amensalism is a relationship in which one species is benefited whereas the other is unaffected

2. Predator is an organism that catches and kills other organism for food.

3. Parasite is an organism which always lives inside the body of other organism and may kill it.

4. Host is an organism which provides food to another organism.

The logistic population growth is expressed by the equation :

1. $\frac{dN}{dt}=rN\left(\frac{N-K}{N}\right)$

2. $\frac{dt}{dN}=Nr\left(\frac{K-N}{K}\right)$

3. $\frac{dN}{dt}=rN\left(\frac{K-N}{K}\right)$

4. $\frac{dN}{dt}=rN$

Consider the following statements (A)-(D) each with one or two blanks :
(A) Bears go into ________ (1) _ during winter to ________ (2) _ cold weather.
(B) A conical age pyramid with a broad base represents _________ (3) human population.
(C) A wasp pollinating a fig flower is an example of ________ (4) _ .
(D) An area with high levels of species richness is known as _________ (5) .

Which of the following options, gives the correct fill ups for the respective blank numbers from(1) to (5) in the statements ?

1. (1) - hibernation, (2) - escape, 3) - expanding, (5) - hot spot
2. (3) - stable, (4) - commensalism, (5) - marsh
3. (1) - aestivation, (2) - escape, (3) - stable, (4) - mutualism
4. (3) - expanding, (4) - commensalism, (5) - biodiversity park

Match the items in Column-I with those in Column-II:

Select the correct option from the 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)

A male insect mistakes an orchid flower to be female due to its shape and performs the act of copulation and induces pollination. This is an example of:
1.  Mimicry
2.  Pseudocopulation
3.  Pseudo pollination
4.  None

Two different species cannot live for a long duration in the same niche or habitat. This is:

1. Allen's law

2. Gloger's rule

3. Competitive exclusion principle

4. Weismann's theory

Which of the following is a correct pair : -

1. Cuscuta – parasite

2. Dischidia – insectivorous

3. Opuntia – predator

4. Capsella – hydrophyte

Mycorrhiza is an example of

1. Symbiotic relationship

2. Ectoparasitism

3. Endoparasitism

4. Decomposers

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