Fill in the blanks.

A. Plants are called as ____________ because they fix carbon dioxide.

(a) Following are the responses of different animals to various abiotic factors. Describe each one with the help of an example.

(i) Regulate

(ii) Conform

(iii) Migrate

(iv) Suspend

(b) If 8 individuals in a population of 80 butterflies die in a week, calculate the death rate of population of butterflies during that period.

OR

(a) What is a trophic level in an ecosystem? What is ‘standing crop’ with reference to it?

(b) Explain the role of the ‘first trophic level’ in an ecosystem.

(c) How is the detritus food chain connected with the grazing food chain in a natural ecosystem?

Justify the pitcher plant as a producer.

Given below is a figure of an ecosystem. Answer the following questions.

i. What type of ecosystem is shown in the figure.

ii. Name any plant that is characteristic of such ecosystem.

Is the common edible mushroom an autotroph or a heterotroph?

Arrange the following as observed in vertical stratification of a forest: Grass, Shrubby plants, Teak, Amaranths.

What is the ultimate source of energy for the ecosystems?

How do you distinguish between humification and mineralisation?

Give two examples of artificial or man made ecosystems. List the salient features by which they differ from natural ecosystems.

Is an aquarium a complete ecosystem?