Energy Flow in an Ecosystem

Q.

What is the main difference between producers and consumers with examples?

Q.

Choose the correct option from the below about food chain:

1. The flow of energy is not unidirectional in the food chain.

2. The size of any food chain is usually restricted to 3-5 trophic levels.

3. For food chains to sustain, the inorganic nutrients must keep circulating.

4. As the trophic levels increases, the size of the population decreases.

Q.

Which group of organisms are not constituents of a food chain?

(i) Grass, lion, rabbit, wolf

(ii) Plankton, man, fish, grasshopper

(iii) Wolf, grass, snake, tiger

(iv) Frog, snake, eagle, grass, grasshopper

1. (i) and (iii)

2. (iii) and (iv)

3. (ii) and (iii)

4. (i) and (iv)

Q. Which of the following can act as the top consumer in a grassland ecosystem?

1. Carnivores
2. Bacteria
3. Either carnivores or herbivores
4. Herbivores

Q. Green plants prepare their own food, so they are called producers.

1. True
2. False

Q. Why does a food chain consists of a few step only ?

Q.

Based on their mode of ____ organisms are classified into producers, consumers and decomposers.

1. nutrition
2. reproduction
3. digestion
4. growth

Q.

Are humans part of the food chain?

Q. Food web and food chain are made up of different trophic levels.

1. True
2. False

Q. Energy that is passed on to herbivores come back to autotrophs.

1. True
2. False

Q. The importance of ecosystem lies in

1. flow of energy
2. cycling of materials
3. both (a) and (b)
4. predation

Q. Who is responsible for converting complex organic substances into simple inorganic substances in an ecosystem?

1. Producer
2. Primary consumer
3. Secondary consumer
4. Decomposer

Q. During the carbon cycle, which of the following carbon compounds would be utilized as an energy source by heterotrophs?

1. Carbon dioxide
2. Carbon monoxide
3. Carbonic acid
4. Organic molecules

Q. The part of the earth comprising the soil, air, and water which sustains life is called:

1. Lithosphere
2. Hydrosphere
3. Atmosphere
4. Biosphere

Q.

How does the First Law of Thermodynamics affect our lives?

Q. Find the odd one out:

1. Typha, Pistia, Eichhornia, Dipterocarpus
2. Teak, Parthenium, Pine, Sandalwood
3. Hyena, Cow, Deer, Rabbit
4. Fusarium, Leptocorsia, Aspergillus, Polycarpus

Q. Explain why the flow of energy is unidirectional?

Q. The energy flow in an ecosystem is

1. Multidirectional
2. Unidirectional
3. Bidirectional
4. Circular

Q. In the given figure, the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?

1. $T_4$
2. $T_1$
3. $T_3$
4. $T_2$

Q. How do producers function in an ecosystem?

Q.

(Think and answer) Consumers depend on producers in a food chain. How?

Q.

The driving force or primary source of energy for the grazing food chain is

1. Plants

2. Sun

3. Dead organic matter

4. Both (a) and (c)

Q. Which group of organisms together will not form a food chain?
I. Grass, lion, rabbit, wolf
II. Plankton, man, hawk
III. Lion, grass, snake, tiger
IV. Frog, snake, eagle, grass, grasshopper

1. I and III
2. III and IV
3. II and III
4. I and IV

Q. Which of the following statements regarding energy flow is/are false?
I. Detritus food chain begins with dead organic matter
II. In aquatic ecosystem, detritus food chain is the major conduit for energy flow
III. In terrestrial ecosystem a larger fraction of energy flows through grazing food chain
IV. Producers belong to the first trophic level of the food chain

1. II and III only
2. III and IV only
3. I and IV only
4. I and II only
5. I, II and III only

Q. In an ecosystem, energy is dissipated as _______ energy during biological processes, which cannot be recycled.

1. light
2. chemical
3. heat
4. mechanical

Q. _____ return nutrients to the soil for plants to use, so they are also called nutrient recyclers.

1. Primary consumers
2. Producers
3. Secondary consumers
4. Decomposers

Q. There is no loss of energy when energy is transferred from one trophic level to the next trophic level.

1. True
2. False

Q. The ___ in an ecosystem converts organic materials to inorganic forms .

Q. Consider the given food chains and choose the correct option.

1. Shrub $\to$ Deer $\to$ Lion
2. Plant $\to$ Camel $\to$ Wolf
3. Grass $\to$ Grasshopper $\to$ Frog

1. Producers $\to$ Plant, grass and grasshopper
   Primary consumers$\to$ Shrub, frog and wolf
   Secondary consumers$\to$ Deer, camel and lion
2. Producers $\to$ Plant, frog and wolf
   Primary consumers$\to$ Shrub, grass and grasshopper
   Secondary consumers$\to$ Deer, camel and lion
3. Producers $\to$ Plant, grass and shrub
   Primary consumers$\to$ Deer, camel and grasshopper
   Secondary consumers$\to$ Wolf, frog and lion
   
4. Producers $\to$ Plants, frog and lion
   Primary consumers$\to$ Deers, camel and grasshopper
   Secondary consumers$\to$ wolves, grass and shrubs

Q. Who is responsible for converting complex organic substances into simple inorganic substances in an ecosystem?

1. Producer
2. Primary consumer
3. Secondary consumer
4. Decomposer