Question

1. Difference between food chain and food web ?with example

2. Velency and valence electron?

3. Example of tertiary and secondary consumer?

4. In which trophic level does scavenger and decomposers exist?

Answer 1

1  food chain only follows just one path as animals find food. eg: A hawk eats a snake, which has eaten a frog, which has eaten a grasshopper, which has eaten grass. A food web shows the many different paths plants and animals are connected. eg: A hawk might also eat a mouse, a squirrel, a frog or some other animal.
2 valency is the ability of an atom to lose or gain electrons while valence electons is the no. of electrons in its outermost shell.valency = combining capacity of an atom expressed as the no. of single bondsthe atom can form or the no. of electrons an element gives up or accepts when reacting to form a compound.
3 Secondary consumers: frogs, small fish, krill, spiders. Tertiary consumers: snakes, raccoons, foxes, fish. Quaternary consumers: wolves, sharks, coyotes, hawks, bobcats. Note: Many animals can occupy different trophic levels as their diet varies.