Natural selection operates at the level of :-

1. Organism

2. Population

3. Community

4. Ecosystem

Regional and local variations within each biome lead to the formation of a wide variety of:-

1. Niche

2. Population

3. Microclimate

4. Habitat

Match the column A with column B :-

               A                                                 B                 

a. phytophagous insects           i) A stage of suspended development 

b. Diapause                            ii) To avoid summer related problem 

c. Homeostasis                       iii) feeding on plant sap

d. Aestivation                        iv) Maintenance of constant internal environment 

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

2. a-(iii), b(i), c-(iv), d-(ii)

3. a-(i), b(iii), c-(ii), d-(iv)

4. a-(iii), b(ii), c-(iv), d-(i)

Ecology explains us:-

ln the given figure, identify Coniferous forest, Arctic and Alpine Tundra and tropical forest, respectively:-

1. l, Vl and lll

2. V, Vl and lll

3. lV, lll and l

4. l, ll and lll

Formation of wide variety of habitats takes place by:-

1. Types of species inhabiting that area

2. Types of predation

3. Regional and local variation of environment conditions

4. All of the above 

Biocontrol of crop pests is often based on which of the following interspecific interactions ? 

1. Competition

2. Amensalism

3. Predation

4. Commensalism

Find the correct mathematical expression for geometric growth resulting in a J-shaped population growth curve.

1. $\frac{\mathrm{dN}}{\mathrm{dt}}=\mathrm{rN}$

2. $\frac{\mathrm{K}-\mathrm{N}}{\mathrm{K}}$

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

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

Epiphytes growing on mango is an example of which type of the given population interaction?

1. Competition

2. Protocooperation

3. Commensalism

4. Mutualism

Barnacles growing on the back a whale, a type of population interaction, is an example of

1. Competition

2. Mutualism

3. Amensalism

4. Commensalism