The function of the myelin sheath is to: MCQ with Answer and Explanation

Explanation:
The ozone layer, a region of high ozone concentration, is located in the stratosphere, approximately 15 to 35 kilometers above Earth's surface, where it absorbs harmful UV radiation. Chlorofluorocarbons (CFCs), once widely used in refrigerants and aerosols, release chlorine atoms in the stratosphere that catalytically destroy ozone molecules, leading to ozone depletion. Global warming is primarily caused by an increase, not a decrease, in atmospheric greenhouse gases like carbon dioxide (CO2), which trap more heat. Thus, statements 1 and 2 are correct.

Explanation:
Angiosperms are flowering plants where seeds are enclosed within a mature ovary (fruit). They are characterized by double fertilization, where one male gamete fuses with the egg and the other with the secondary nucleus. They exhibit immense diversity in habit, ranging from tiny aquatic Wolffia to massive trees, so not all are trees. Statements 1 and 2 are correct.

Explanation:
Neisseria meningitidis (meningococcus) causes bacterial meningitis, an inflammation of the meninges. N. gonorrhoeae causes gonorrhea. Pneumonia is often Streptococcus pneumoniae.