Introduction to Ecosystem Structure

Q.

In an ecosystem, _______ represents a step wise transfer of energy through food.

Q. Which of the following statements about ecosystems is false?

1. Ecosystems involve an interaction between both living and nonliving components.
2. Ecosystems are dynamic.
3. Ecosystems are shaped by the activities of the organisms that inhabit them.
4. Ecosystems are made up of only inorganic materials.

Q. If decomposers are removed what will happen to the ecosystem?

1. Energy cycle is stopped
   
2. Mineral cycle is stopped
3. Consumers cannot absorb solar energy
4. Rate of decomposition of mineral increases

Q. Which one of the following is a characteristics feature of cropland ecosystem ?

1. Absence of soil organisms
2. Least genetic diversity
3. Absence of weeds
4. Ecological succession

Q. ___are organisms which break up dead plant and animal remains into organic and inorganic matter.

Q. Boundaries between one ecosystem and another are indistinct and overlapping. Therefore, all ecosystems on the earth are joined together to form a single global ecosystem known as

1. population
2. species
3. biosphere
4. community

Q. The dead remains of plants and animals are the major source of energy for ___.

1. Herbivores
2. Tertiary consumers
3. Saprotrophs
4. Autotrophs

Q. The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show ?

1. The population of its predators increases enormously
2. S - shaped or sigmoid growth of this insect
3. The food plants mature and die at the end of the rainy season
4. Its population growth curve is of J-type

Q. Which one of the following is a characteristic feature of cropland ecosystem?

1. Absence of soil organisms
2. Least genetic diversity
3. Absence of weeds
4. Ecological succession