The anti-UV mutation of microorganisms must be induced by ultraviolet rays
举一反三
- Ultraviolet rays from the Sun can cause which of the following?
- The invisible rays of the()beyond the violet end are called the ultraviolet rays. A: speculation B: spectrum C: sleet D: range
- In the secondary structure of roots, xylem rays and phloem rays belong to ( ). A: Secondary rays B: Vascular rays C: Pith rays
- Why do white camp-making bats need protection from the sun’s rays (). A: They are active during daylight hours B: Their heads are exposed to sunlight while they sleep C: They have only partially adapted to their tropical environment D: Their wings are easily damaged by ultraviolet radiation
- Which statement was NOT mentioned about viewing an eclipse A: Sunglasses block out only a limited amount of the sun’s ultraviolet rays that can damage the eye. B: Sunglasses can only filter harmful rays during total solar eclipses at their greatest magnitude. C: Sunglasses tend to cause the center of the eye to enlarge allowing in more intense light. D: Sunglasses should be used when any part of the sun is visible.