Energy Flow

Q.

Describe the energy flow in an ecosystem.

Q.

How does the sun produce light?

1. Sun just reflects light from other stars to Earth

2. Nuclear reaction in the Sun emits energy in the form of light

3. None of these

4. Sun is made of many illuminating particles which emit light

Q.

State the importance of green plants in an ecosystem.

Q.

Define carnivores. Name any two primary and secondary carnivores.

Q.

Paheli wrote a food chain in the following way: frog → eagle → insects → grass → snake. The chain is not in the correct order. Help her to write the food chain correctly.

Q.

Energy enters in a food chain through :

(a) primary consumers

(b) secondary consumers

(c) tertiary consumers

(d) producers.

Q.

Show that the energy flow in an ecosystem is linear.

Q.

What is the source of chemical energy?

Q.

An energy pyramid depicts the amount of energy contained in each trophic level, as one progresses from first tropic level to fourth trophic level in this pyramid, what happens to the amount of stored energy?

1. The amount of stored energy increases.

2. The amount of stored energy remains same in all the levels.

3. The amount of stored energy depends upon the type of consumers.

4. The amount of stored energy decreases.

Q.

Name two natural processes which go on all the time in the ecosystem.

Q.

The source of energy in an ecosystem is :

(a) sun (b) decayed bodies

(c) green plants (d) sugar.

Q.

The ultimate source of energy is :

(a) Wood (b) wind

(c) water (d) sun.

Q. Differentiate between producer and consumer in ecosystem

Q.

What is the basis of grouping organisms into producers, consumer and decomposers?

1. Manner in which they obtain sustenance from environment.

2. Energy efficiency

3. Geographical distribution

4. Physiological Characters

Q.

What is the main source of energy for the earth ?

Q.

As energy is passed from one trophic level to another, the amount of usable energy

1. increases

2. decreases

3. remains the same

4. energy is not passed from one trophic level to another

Q.

Flow of matter in food chain is not unidirectional because

1. Matter is transformed into chemical energy.

2. Matter can be recycled but re-used.

3. Matter is transformed into physical energy.

4. Matter is uni-directional.

Q. What is ten per cent law?

Q.

State the law which governs the energy flow in an ecosystem.

Q. In Ocean thermal energy plant, the volatile liquid like______ is used

1. Helium
2. ammonia
3. Water
4. hydrogen

Q. Show that the energy flow in an ecosystem is linear

Q. Match column I with column II and select the correct answer using the codes given below :

Q.

What is a food chain?

Q. Sun gets its energy through ______ occurring inside it.

1. nuclear fusion
2. Both A and B
3. nuclear fission
4. None of the above

Q. In an ecosystem, food chain represents a step wise ______ contained in the food.

1. Transfer of power
2. Transfer of energy
3. Transfer of mass
4. None of the above

Q. Suppose $1000Joules$ of energy falls on the leaves of green plants. How much energy is available to the plants to produce chemical or food energy

1. $1000J$
2. $10J$
3. $100J$
4. $50J$

Q. If $200J$ energy falls on the leaves of green plant. How much energy will be lost into the environment?

1. $40J$
2. $110J$
3. $20J$
4. $180J$

Q. Green plants in terrestrial ecosystem capture about ______ of the energy of sunlight that falls on it.

1. $10\%$
2. $1\%$
3. $50\%$
4. $20\%$

Q. Hydro Power plants convert __________ energy of falling water into electricity. Fill in the gap.

1. Chemical
2. tidal
   
3. thermal
4. Potential

Q. Question 1
What is a good source of energy?