Question

There is mass mortality of fishes in a pond. What may be the reasons?

August 12, 2024

Answer

(𝐢) Addition of hot water.

(𝐢𝐢) Addition of poisonous (mercury) compounds in water.

(𝐢𝐢𝐢) Blockage of gills of fishes with any pollutant.

💡 Some Related Questions

Raghu switched from traditional to modern farming practices in which he used large amounts of fertilisers and pesticides to gain an increase in profit. (𝐢) What are the adverse effects of modern farming? (𝐢𝐢) What do you think will be effect on the soil in long run? (𝐢𝐢𝐢) What alternative method could be more beneficial for farming?

A news item, telling about mysterious disease affecting people of nearby village, inspired Rahul to find out the cause behind it. On investigation, he discovered that the only source of water for the village is a small river on whose banks three paper factories are situated. Rahul along with villagers made efforts and got those factories closed. (𝐢) what values are promoted by Rahul? (𝐢𝐢) What role should the government play in protecting the environment? (𝐢𝐢𝐢) Do you identify with the cause Rahul fought for?

The Resident Welfare Association of an area refused the proposal of installation of a mobile tower in their complex. (𝐢) Co-relate the refusal with the environment and extinetion of house sparrow. (𝐢𝐢) Comment upon the values shown by RWA.

A gardener was seen burning dry leaves in the garden daily by a bunch of school kids. The kids went to him and advised not to burn those leaves and told about this practice’s ill effects. (𝐢) What ill-effects were the kids talking of? (𝐢𝐢) What do you suggest the gardener to do with the leaves instead of burning? (𝐢𝐢𝐢) Write any two values shown by the kids.

A priest of temple collected dried garlands, holy old books and some statues. He asked his son to throw in the river. But instead of throwing, he buried them in the soil. (𝐢) In the situation above, who wins your support: the priest or the son? Justify your answer by giving two reasons. (𝐢𝐢) What are the values reflected in the behaviour of son?

Raj is a farmer residing on the outskirts of Delhi. Upon a visit to a fertiliser shop, the salesman inquired of Raj of the crop he anticipated to cultivate in the coming season. During the conversation, the crop concerned was conveyed. The salesman suggested that urea and other nitrogenous fertiliser be used. Mukesh, quietly but keenly listening the conversation intervened and told Raj that for the concerned crop nitrogenous fertilisers shall not be required. Respond to the following questions using the information provided above: (𝐢) What values are shown by Mukesh? (𝐢𝐢) What can be the concerned crop possibly? (𝐢𝐢𝐢) What can be the reason for Mukesh’s suggestion?

A laundry engaged in washing clothes has been pouring waste water directly into the river. Over a period of time, it was found that large numbers of fish were dying in the river. Answer the following questions based on the above information: (𝐢) Mention the reasons for the dying of fish. (𝐢𝐢) Is there any way it can be avoided? (𝐢𝐢𝐢) Mention values associated with above situation.

Parul has gone for a picnic near a lake along with her classmates and teacher. All the children were happy to be in such a beautiful place and started playing. All the children spread the toffee wrappers and empty chips packs in either the lake or the garden. The teacher observed that it was only Parul who collected all these wastes and put them in the dustbins. Teacher was delighted by Parul’s act and told everyone to follow Parul’s example. Answer the following questions based on the above information: (𝐢) What values are being promoted by Parul? (𝐢𝐢) How can throwing waste in the lake affect the environment? (𝐢𝐢𝐢) Suggest some ways by which you can spread awareness about pollution in your school?

Anurag’s friend visits his house for the weekend. He observes the following undesired practices without much care for water: (𝐢) Plants are watered 2-3 times a day excessively. (𝐢𝐢) Taps are often running even when not required. (𝐢𝐢𝐢) Cars are being washed by wrong methods leading to lot of wastage of water. He talks to Anurag about the wrong practices resulting in wastage of water and tells him that water should be used judiciously. Answer the following questions based on the above information: (𝐢) Which values are being neglected in the activities in the above situation? (𝐢𝐢) What are the adverse effects of the activities observed at Anurag’s house? (𝐢𝐢𝐢) How can the values related to minimisation of wastage of water in everyday life be promoted?

While driving in the countryside, Kapil saw square panels attached on the street lights along the road. He found out that these were photovoltaic solar panels which tapped solar energy and converted it to electrical energy to make the street lights function. He liked this idea so much that he got similar solar panels installed at his residence also. Answer the following questions based on the above information: (𝐢) In what respects is the installation of solar panels useful to Kapil? (𝐢𝐢) Which values is Kapil promoting by installing solar panels? (𝐢𝐢𝐢) How can Kapil promote similar values to other in the neighbourhood?