The endosymbiosis between early eukaryotes and the prokaryote lineage would be an example of:

1.	Commensalism	2.	Mutualism
3.	Parasitism	4.	Competition

The type of population interaction exhibited by visiting flamingos and resident fishes in South American Lakes, is also shown by

1. Sparrow eating any seed.

2. Cuckoo and crow.

3. Abingdon tortoise and goats in Galapagos island.

4. Sea anemone and clown fish.

Ecology is basically concerned with four levels of biological organization, which one of the following is
correct representation?

1. Population $\to$ Ecosystem $\to$ Biome $\to$ Landscape.

2. Communities $\to$ Population $\to$ Ecosystem $\to$ Biome.

3. Organisms $\to$ Population $\to$ Communities $\to$ Biome.

4. Species $\to$ Ecosystem $\to$ Communities $\to$ Biome.

Epiphytes:
1. are aerial vines common in tropical regions
2. are parasitic and use haustoria
3. live in oligotrophic soil and digest insects to obtain nitrogen
4. grow on other plants but do not obtain nutrients from their hosts

Earliest vascular plants on land acquired water and mineral nutrients most likely by:
1. absorption by trichomes.
2. diffusion through stomata.
3. the help of symbiotic mycorrhizae.
4. osmosis through the root hairs.

Mycorrhizal hyphae helps in:
1. absorbing minerals and ions
2. maintaining cell shape
3. increasing cellular respiration
4. anchoring a plant

The population with the following age pyramid:

1. Will grow exponentially in near future

2. Will grow steadily in the future

3. Is likely to remain stable in future

4. Is likely to decline in future

Population size in any given habitat is also known as _______

Select the incorrect statement

Smaller animals tend to lose body heat very fast as compared to larger animals because they have