Advertisements
Advertisements
Question
What is meant by a primary consumer, secondary consumer and a tertiary consumer? Give one example of each.
Advertisements
Solution
Herbivores that feed on plants are called primary consumers. Example: Insects.
Small carnivores that feed on other animals, especially herbivores, are called secondary consumers. Example: Frogs.
Large carnivores that feed on other animals, especially secondary consumers, are called tertiary consumers. Example: Birds.
Insects → Frogs → Birds
(Primary consumers) (Secondary consumers) (Tertiary consumers)
APPEARS IN
RELATED QUESTIONS
"Energy flow in a food chain is unidirectional" Justify this statement.
Give reason to justify the following: Flow of energy in a food chain is unidirectional.
"Our food grains such as wheat and rice, the vegetables and fruits and even meat are found to contain varying amounts of pesticide residues." State the reason to explain how and why it happens?
What is biological magnification?
At which trophic level a person is feeding when he is eating roasted chicken.
One of the following is not a consumer. This one is :
(a) giraffe
(b) antelope
(c) algae
(d) alligator
The following is a food chain that ends with human :
Do you think that the food chain given in this question can really be regarded as a food chain? Explain your answer.
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Name two zooplanktons.
Write the percentage of energy transferred from autotrophs to the next level in a food chain.
Fill in the following blank with suitable word :
Grass → ........... → Human
What is meant by bioconcentration of pesticides
Which common pesticide has accumulated in human body in considerable amounts?
The harmful chemical which is accumulating in human beings through food chain is :
(a) benzenehexachloride
(b) dichlorodiphenyltrichloroethane
(c) chlorofluorocarbon
(d) abscisic acid
| Human body is made up of five important components, of which water is the main component. Food, as well as potable water, are essential for every human being. The food is obtained from plants through agriculture. Pesticides are being used extensively for a high yield in the fields. These pesticides are absorbed by the plants from the soil along with water and minerals and from the water bodies these pesticides are taken up by the aquatic animals and plants. As these chemicals are not biodegradables, they get accumulated progressively at each trophic level. The maximum concentration of these chemicals gets accumulated in our bodies and greatly affects the health of our mind and body. |
- Why is the maximum concentration of pesticides found in human beings? (1)
- Give one method which could be applied to reduce our intake of pesticides through food to some extent. (1)
- Various steps in a food chain represent: (1)
- Food web
- Trophic level
- Ecosystem
- Biomagnification
- With regard to various food chains operating in an ecosystem, man is a: (1)
- Consumer
- Producer
- Producer and consumer
- Producer and decomposer
Animals that eat both plants and animals are called as Carnivores.
Differentiate between herbivores and carnivores.
In a food chain, the third trophic level is always occupied by
In the given food chain, suppose the amount of energy at the fourth trophic level is 5 kJ, what will be the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
Use of several pesticides which results in excessive accumulation of pesticides in rivers of ponds, is a matter of deep concern. Justify this statement.
