Biotic Factors and Energy Flow

Q.

Which of the following require maximum energy?

1. Secondary consumers

2. Decomposer

3. Primary consumers

4. Primary producers

Q.

Carnivores occupy what trophic level in the food chain?

Q.

What is the ultimate source of energy for the biosphere?

Q. Regarding assertion and reason, choose the right option
Assertion [A] - The earth is a closed system with respect to matter and open with respect to energy.
Reason [R] - Energy is not recycled in an ecosystem.

1. Both A and R are true and R explains A
2. Both A and R are true R does not explain A
3. A is true and R is false
4. Both A and R are false

Q.

Decay of organic matter releases the gas into air is

A.Nitrogen

B.ammonia

c.carbondioxide

D.none

Q.

Both biotic and abiotic components play an important role in a sustainable ecosystem.

1. True

2. False

Q. Energy accumulated by plants or the producers in an ecosystem is called____production.

1. Primary
2. Secondary
3. Tertiary
4. Centenary

Q. State whether true or false.
The energy flow in an ecosystem is based on the primary productivity of autotrophs.

1. True
2. False

Q.

Question 3 (d)

Fill up the blank
Soil, water and air are the___ factors of a habitat.

Q.

Write a common food chain of a pond ecosystem.$\mathrm{Phytoplankton}\to \mathrm{zooplankton}\to \mathrm{small}\mathrm{fish}\to \mathrm{large}\mathrm{fish}\to \mathrm{birds}$

Q. How do biotic and abiotic factor adversely affect crop production?

Q.

Show with the help of a food chain that energy flow is linear.

Q. Which of these are biotic components of the environment?
(a) plants and animals
(b) soil and minerals
(c) air and water
(d) sunlight and temperature

Q. Life span of mayfly is

1. 1 day
2. 3 days
3. 2 days
4. 4 days

Q. Are biotic components of the environment living or non-living?

Q. The major condition of energy flow in an aquatic ecosystem is Grazing food chain (GFC). Whereas in terestrial ecosystem is DFC. Explain ?

Q.

Which one of the following is a wrong statement?

1. Accumulation of toxic substances increases from lower trophic to higher trophic levels.

2. Energy reduces as it flows from producer to consumer.

3. Energy reduces as it moves from lower trophic to higher trophic levels.

4. Energy content will be high in carnivores than herbivores in a food chain.

Q. The importance of ecosystem maintenance lies in

1. Cycling of materials
2. Flow of energy
3. Both of the above
4. None of the above

Q. A food chain in an ecosystem represents the __________________

1. energy flow and transfer of nutrients
2. Biotic components only
3. Both (a) and (b)
4. abiotic components and decomposers

Q.

Flow of energy in an ecosystem is always

1. Bidirectional

2. Unidirectional

3. Multi directional

4. No specific direction

Q.

Name the type of food chains responsible for the flow of larger fraction of energy in aquatic and a terrestrial ecosystem respectively. Mention one difference b/w the 2 food chains.

Q.

Which of the following is/are correct with respect to decomposers in an ecosystem?

1. herbivores will not receive solar energy
2. mineral movement will be blocked
3. the rate of decomposition will be very high
4. energy flow will be blocked

Q.

Matter flow in an ecosystem is ___.

1. Unidirectional
2. All around
3. Both (a) and (b)
4. Bidirectional

Q. Sunlight and heat are ________ factors of an ecosystem.

1. abiotic

2. natural

3. inorganic

4. biotic

Q. Ecosystem consists of ________

1. Biotic components only
2. Abiotic components only
3. Biotic and abiotic components
4. Solar system

Q. Which of the following statements is/are true for an natural ecosystem?

1. Nutrients flow only through natural ecosystems
2. Natural ecosystems include living and non living material
3. Energy flow only through natural ecosystems
4. There is no heat energy loss from natural ecosystems

Q. An ecosystem requires only one external input and that is:

1. Soil
2. Air
3. Water
4. Solar energy

Q. Very Short Answer Type Questions :
Name two different components of an ecosystem

Q. Because there is a loss of energy at each trophic level ....... biomass can be supported at each successive level.

Q.

Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?

1. Less than 1%

2. 30%

3. 2-10%

4. 50%