Advertisements
Advertisements
प्रश्न
Which of the following are decomposers of dead organisms?
| Bacteria | Fungi | Viruses |
| (a) no | yes | yes |
| (b) yes | no | yes |
| (c) yes | yes | no |
| (d) yes | yes | yes |
Advertisements
उत्तर
yes, yes, no
Bacteria and fungi are decomposers of dead organisms.
APPEARS IN
संबंधित प्रश्न
In a food chain of frog, grass, insect and snake, assign trophic level to frog.
Give reason to justify the following: The existence of decomposers is essential in a biosphere.
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
In the following food chain, plants provide 500 J of energy to rats. How much energy will be available to hawks from snakes?
Plants → Rats → Snakes → Hawks
The following statement is true or false :
In biology, human beings are called producers.
Which category of organisms forms the starting point of a food chain?
Which of the following belong to the same trophic level?
Goat ; Spider ; Plants ; Hawk ; Rat
Fill in the following blank with suitable word :
A series of organisms, each of which feeds on the next organism, the beginning of which is a green plant, is called a .............
Draw the food chain with four trophic levels.
What is a food chain?
Which of the following is not a producer?
(a) grass
(b) zooplankton
(c) phytoplankton
(d) paddy
| The following is a food chain that ends with human: plants → bee → human |
- Explain how plants provide food for bees.
- How do bees provide food for humans?
- How does this food chain differ from a usual food chain involving human such as: plants → goat → human?
- Do you think that the food chain given in this question can really be regarded as a food chain? Explain your answer.
The following is a food chain that ends with human :
plants → bee → human
How do bees provide food for humans?
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.
| 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
Green plants utilize ______ percent of sun’s energy to prepare their food by the process of photosynthesis.
______ obtained energy from the chemical breakdown of dead organisms.
In a food chain grasshopper gets energy by eating frog.
Which of the following organisms occupies the role of a producer in a food chain?
