Cyanobacteria, also known as blue algae, are singlecelled and belong to the family of Prokaryotes. That means, they do not have a cell nucleus. The ability of cyanobacteria to perform oxygenic photosynthesis is thought to have converted the early reducing atmosphere into an oxidizing one, which dramatically changed the composition of life forms on Earth by stimulating biodiversity and leading to the nearextinction of oxygen-intolerant organisms.

Correct Option: B

Cyanobacteria, also known as blue algae, are singlecelled and belong to the family of Prokaryotes. That means, they do not have a cell nucleus. The ability of cyanobacteria to perform oxygenic photosynthesis is thought to have converted the early reducing atmosphere into an oxidizing one, which dramatically changed the composition of life forms on Earth by stimulating biodiversity and leading to the nearextinction of oxygen-intolerant organisms.

Itai-itai disease was the documented case of mass cadmium poisoning in Toyama Prefecture, Japan, starting around 1912. The cadmium poisoning caused softening of the bones and kidney failure.

Correct Option: C

Itai-itai disease was the documented case of mass cadmium poisoning in Toyama Prefecture, Japan, starting around 1912. The cadmium poisoning caused softening of the bones and kidney failure.

Plants that are resistant to crude oil toxicity such as black poplar and willows, as well as miscanthus grass (elephant grass) have been found to be effective in the remediation of oil polluted soil. Bioadsorbents like Moringo oliefera seeds and Parthenium hysterophorus plants. are effective for the removal of industrial pollutants in water.

Correct Option: D

Plants that are resistant to crude oil toxicity such as black poplar and willows, as well as miscanthus grass (elephant grass) have been found to be effective in the remediation of oil polluted soil. Bioadsorbents like Moringo oliefera seeds and Parthenium hysterophorus plants. are effective for the removal of industrial pollutants in water.

Paper is organic in nature as it is made from wood and pulp. So it is bio-degradable and useful in recycling.

Correct Option: A

Paper is organic in nature as it is made from wood and pulp. So it is bio-degradable and useful in recycling.

Salt plays a primary role in the processes of digestion and absorption. Salt activates an enzyme in the mouth called salivary amylase. Salt also creates hydrochloric acid. Hydrochloric acid is a very important digestive secretion, which lines the stomach walls.

Correct Option: B

Salt plays a primary role in the processes of digestion and absorption. Salt activates an enzyme in the mouth called salivary amylase. Salt also creates hydrochloric acid. Hydrochloric acid is a very important digestive secretion, which lines the stomach walls.