Pencemaran Lingkungan Kelas 7

The correct answer is a. pencemaran air. Pencemaran air refers to the entry of substances or other components into the water environment, causing a disturbance in its quality. This can include pollutants such as chemicals, waste, or toxins that contaminate the water and negatively impact its natural balance and the organisms that rely on it.

The correct answer is a. pencemaran kimiawi. This is because pollution caused by heavy metals is considered a form of chemical pollution. Heavy metals such as lead, mercury, and cadmium can contaminate the environment through industrial waste, mining activities, and improper disposal of electronic waste. These metals can have toxic effects on both human health and the ecosystem, making it a type of chemical pollution.

A substance that causes pollution is called a pollutant.

Pencemaran yang disebabkan oleh bakteri E. coli disebut pencemaran biologis karena E. coli adalah mikroorganisme hidup yang merupakan bagian dari dunia biologi. Bakteri ini dapat mencemari air dan menyebabkan berbagai masalah kesehatan jika terdapat dalam jumlah yang berlebihan. Oleh karena itu, pencemaran yang disebabkan oleh E. coli termasuk dalam kategori pencemaran biologis.

One way to mitigate pollution caused by factory waste is by treating the waste before disposal. This means that the waste undergoes a process to remove or neutralize harmful substances, making it less harmful to the environment when it is eventually released. Treating the waste before disposal helps to minimize the negative impact on ecosystems and human health, making it an effective solution to combat pollution caused by factory waste.

The correct answer is c. raksa. Penyakit Minamata is a neurological disorder caused by mercury poisoning. It was named after the city of Minamata in Japan, where industrial wastewater containing methylmercury was released into Minamata Bay. The mercury contaminated the fish and shellfish in the bay, which were then consumed by the local population. The consumption of mercury-contaminated seafood led to severe neurological symptoms, including numbness, muscle weakness, and impaired vision and hearing. Therefore, raksa (mercury) is the correct answer.

The correct answer is a. dibuang ke sungai. This is because if household waste in the form of food scraps is disposed of in rivers, it will pollute the environment and contaminate the water. Therefore, it is not recommended to dispose of household waste in rivers.

Blooming algae, also known as algal bloom, is caused by excessive amounts of nutrients, particularly nitrogen and phosphorus, in the water. These nutrients can come from various sources, including agricultural runoff, sewage discharge, and the excessive use of synthetic fertilizers. When these nutrients enter the water, they promote the rapid growth of algae, leading to a bloom. Therefore, the correct answer is c. penggunaan pupuk buatan yang berlebihan, which translates to excessive use of synthetic fertilizers.

DDT memiliki efek yang sangat berbahaya terhadap burung betina karena dapat menyebabkan tipisnya cangkang telur. Ketika DDT terkumpul dalam tubuh burung betina, zat tersebut dapat mengganggu metabolisme kalsium yang diperlukan untuk pembentukan cangkang telur yang kuat. Akibatnya, cangkang telur menjadi tipis dan rapuh, sehingga meningkatkan risiko pecah atau rusak sebelum telur menetas. Hal ini dapat mengganggu siklus reproduksi burung dan mengancam kelangsungan hidup populasi burung tersebut.

Bioremidiasi adalah penggunaan mikroorganisme untuk membersihkan pencemaran yang disebabkan oleh limbah industri. Mikroorganisme ini dapat menguraikan bahan kimia berbahaya yang terdapat dalam limbah industri dan mengubahnya menjadi bahan yang tidak berbahaya atau kurang berbahaya. Dengan demikian, bioremidiasi dapat membantu mengurangi dampak negatif limbah industri terhadap lingkungan.