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

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

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

Verhulst-Pearl population growth is described by the equation

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

2. N_t = N₀e^rt

3. N_t = N₀+B+l-D-E

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

What is true for individuals of same species?
1. Live in same niche
2. Live in same habitat
3. Interbreeding
4. Live in different habitat