Following is the labelled diagram of a male gametophyte of an angiosperm.
Sporopollenin is considered to be the most resistant organic material because it is chemically very stable and it can withstand high temperatures, acidic and alkaline conditions, and enzymes. No enzyme that degrades sporopollenin is so far known.
Study the graph given below. Explain how oxygen concentration is affected in the river when sewage is discharged into it.
Write the scientific names of the causal organisms of elephantiasis and ringworm in humans. Mention the body parts affected by them.