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 biodegradable, 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.(a) Why is the maximum concentration of pesticides found in human beings?(b) Give one method which could be applied to reduce our intake of pesticides through food to some extent.(c) Various steps in a food chain represent :(a) Food web (b) Trophic level (c) Ecosystem (d) Biomagnification (d) With regard to various food chains operating in an ecosystem, man is a:(a) Consumer (b) Producer (c) Producer and consumer (d) Producer and decomposer
(a) The maximum concentration of pesticides is found in human beings because humans comprise the topmost level into the food chain, and in the process of biological magnification, the concentration of pesticides increases from going bottom to top-level organisms.
(b) Organic farming should be practiced to reduce the intake of
pesticides through food to some extent. In organic farming, chemical pesticides must be replaced with biopesticides.
(c) Various steps in a food chain represent: Trophic level
(d) With regard to various food chains operating in an ecosystem, man is: Consumer
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- Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as :(a) eutrophication (b) pollution (c) biomagnification (d) accumulation
- A food chain comprises of cat, seed-eating bird, plants, and dog. The organism which will have the maximum concentration of harmful pesticides coming through the food chain is most likely to be :(a) cat (b) plants (c) dog (d) seed-eating bird
- The unused parts of the food in our body are ___.(a) Defacated(b) Digestion(c) Ingestion(d) None of these
- In addition to wheat plants, a crop field ecosystem has organisms such as snake, peacock, eagle, and mice. If the wheat plants are sprayed with pesticides periodically, which of the following will have the minimum concentration of pesticides in the body?(a) snake (b) eagle (c) mice (d) peacock
- Which of the following gets the minimum energy through the food chain in an ecosystem?(a) carnivore (b) large carnivore (c) producer (d) herbivore
- Which of the following limits the number of trophic levels in a food chain?(a) insufficient food supply from producer level(b) decrease in energy at higher trophic levels(c) increase in the number of organisms at higher trophic levels(d) accumulation of harmful chemicals at higher trophic levels
- Food Web Is Constituted by (A) Relationship Between the Organisms and The Environment. (B) Relationship Between Plants and Animals. (C) Various Interlinked Food Chains in an Ecosystem. (D) Relationship Between Animals and Environment. Justify Your Answer
- A forest ecosystem having a lot of green plants has some foxes, lions and rabbits in it.(a) Write a food chain comprising all the four organisms mentioned above.(b) Name (i) one herbivore, and (ii) two carnivores, in this food chain.(c) Name the link which is a predator as well as a prey.(d) Name (i) second trophic level, and (ii) third trophic level.(e) Which link of this food chain can feed on second trophic level as well as third trophic level, independently?(f) If the sun provides 1000 J of energy to the plants, then how much energy will be transferred to fox through the food chain.
- The following is a food chain that ends with human :plants → bee → human(a) Explain how plants provide food for bees.(b) How do bees provide food for humans?(c) How does this food chain differ form a usual food chain involving human such as: plants → goat → human?(d) Do you think that the food chain given in this question can really be regarded as a food chain? Explain your answer.
- Fill in the following blanks with suitable words :(a) Ultraviolet rays can cause skin..............(b) Pesticides enter the food chain at the ...........level(c) Grass → ........... → Human(d) Lettuce → ............. → Fox(e) Plants → Antelope → ............
- Why our body cannot make food from carbon dioxide, water and minerals like plants do?
- Find out the names of plants that grow in water and which are eaten as food.
- Which of the following is accompanied in a plant by utilizing the energy stored in ATP?(a) transport of food (b) transport of water and minerals (c) transport of oxygen (d) transport of water, minerals and food
- An aquatic food chain comprises of the organisms like tadpoles, weeds, fish and water beetles. The organism which gets the minimum energy through this food chain is :(a) water beetles (b) tadpoles (c) weeds (d) fish
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