Case Based Questions (MCQ)

Class 10
Chapter 15 Class 10 - Our Environment

## Food chains are very important for the survival of most species.

### d) It will depend on the type of the terrestrial plant.

6.1 b) 100 J

Only 1% of the energy of sunlight that falls on leaves is convert into food energy by plants

If 10,000J is the energy of sunlight;

(1/100) x 10000 = 100J

Common mistake : Only 1% of energy from sunlight is converted to food energy. On the other hand, 10% of the energy flows from one trophic level to another

### d) Fourth trophic level

6.2 c) Third Trophic leve

Curd is made from milk which is obtained from cow

Cow is a primary consumer that feeds on producer (grass) and occupies the second trophic level

Consuming the produce obtained from an organism at second trophic level makes Ravi belong to the third trophic level

• ### Release enzymes outside their body to convert organic material to inorganic forms

6.3 a) Act at every trophic level of the food chain

Thus, they do not belong to any particular trophic level

### d) Energy is multidirectional and matter is bidirectional.

6.4 c) Energy is unidirectional and matter is repeatedly circulating

### d) Water

6.5 a) Decrease in energy at higher trophic level

The energy keeps on decreasing in each trophic level

This decrease is due to the heat released

As a result, the number of trophic levels is limited

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