Trophic Levels

Q.

What is heterotrophic mode of nutrition? Give two examples of heterotrophs. [2 MARKS]

Q. Grass $\to$ Rabbit $\to$ Wild cat $\to$ Tiger In the given food chain, the organism which act as primary carnivore is

1. Wild cat
2. Rabbit
3. Tiger
4. Grass

Q.

Why are green plants called autotrophs?

Q.

Question 17
Match the organisms given in Column I with their mode of nutrition given in Column II.

$\begin{array}{cc}& \\ ColumnI& ColumnII\\ \left(a\right)Mangotree& \left(i\right)Insectivorousplant\\ \left(b\right)Mushroom& \left(ii\right)Heterotroph\\ \left(c\right)Pitcherplant& \left(iii\right)Autotroph\\ \left(d\right)Cuscuta& \left(iv\right)Saprophyte\\ \left(e\right)Elephant& \left(v\right)Parasitic\end{array}$

Q.

In the above given food web, identify the secondary consumers and select the correct option.

1. Deer, Rabbit, Mouse, Wolf
2. Jackal, Fox, Wild Cat, Tiger, Wolf
3. Wolf, Fox, Antelope, Deer
4. Wolf, Tiger, Wild Cat, Rabbit, Mouse

Q. Assertion: Carnivores have shorter small intestine while herbivores have longer small intestine.
Reason: Meat is more difficult to digest than cellulose.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not a correct explanation of A.
3. A is true but R is false.
4. A and R are false.

Q.

How do autotrophs make their food?

Q.

Green plants are called autotrophs.

1. True
2. False

Q.

How many of the following will act as a decomposer in a pond ecosystem?

1. Earthworm
2. Fungus
3. Spider
4. Woodlouse

1. One

2. Two

3. Three

4. Four

Q. The sequential interlinking of organisms involving transfer of food energy from the source through a series of organisms with repeated eating and being eaten is called__________.

1. Food web
2. Food Chain
3. Biomagnification
4. Ecosystem

Q. A food web can have more than one producer.

1. True
2. False

Q.

Two examples of decomposers are ------- and -------.

Q.

In the given food web, an increase in the population of hawks will not result in:-

1. decrease in the population of rabbits and snakes.

2. increase in the population of producers.

3. increase in the population of grasshoppers.

4. increase in the population of lizards.

Q. Why a frog cant eat a scorpion?

Q. Which of the following is a grazing food chain?

1. Grass → Rabbit → Fox → Tiger
2. Detritus → Earthworm → Sparrow
3. Tree → Birds → Bugs
4. Detritus → Earthworm → Frog → Snake → Eagle

Q. A network of food chains operating in an ecosystem which are interconnected at various trophic levels so as to form a number of feeding connections among the different organisms of a biotic community is called___________.

1. Trophic level
2. Food web
3. Ecosystem
4. Biomagnification

Q.

Are microorganisms decomposers?

Q. Which of the following options is not a component food chain?

1. Grassland
2. Wolf
3. Snake
4. Lion

Q.

Biotic and Abiotic factors are related to each other by______

1. Ecosystem

Q.

Assertion: The plant biomass which serves as the food of herbivores and decomposers is said to result from the gross primary productivity.
Reason: Gross primary productivity is the rate at which consumers convert the chemical energy of their food into their own biomass.

1. If both assertion and reason are true and the reason is the correct explanation of assertion.

2. If both assertion and reason are true but the reason is not the correct explanation of assertion.

3. If the assertion is true but the reason is false.

4. If both assertion and reason are false.

Q.

What is a Biotic factor

1. Any living component

2. Any living component that affects another organism

3. Non-living things

4. An Organism

Q. Autotrophs are also known as_________.

1. producers
2. primary consumers
3. secondary consumers
4. tertiary consumers

Q. Which of the following constitutes a food chain?

1. Grass, Wheat and Mango
2. Grass, Goat and Human
3. Goat, Cow and Elephant
4. Grass, Fish and Goat

Q.

Question 4
Pitcher plant traps insects because it

(a) is a heterotroph.
(b) grows in soils which lack in nitrogen.
(c) does not have chlorophyll.
(d) has a digestive system like human beings.

Q. Organisms which synthesise carbohydrates from inorganic compounds by using radiant energy are called:​

1. carnivores​
2. producers​
3. decomposer​
4. herbivores​

Q. What are trophic levels? How many tropic levels can a food chain have?

Q. Aquatic plants → Aquatic insects → Fish → Crocodile
In the given food chain, crocodile is__________.

1. Secondary carnivore
2. Primary carnivore
3. Secondary consumer
4. Primary consumer

Q.

Why only grass can be digested by herbivores animal why not by human beings explain

Q. Decomposers feed on producers.

1. True
2. False

Q.

explain role of producers, consumers and decomposers

based on food chain.

grass -rabbit -snake -eagle- bacteria