Answer: RNA.
- A DNA
- B RNA
- C Both DNA and RNA
- D Neither
Correct answer: B. RNA
Explanation: TMV is an RNA virus (single-stranded RNA). It was the first virus to be discovered and crystallized (by Wendell Stanley in 1935). It infects tobacco plants.
Plants evolved from water-dependent algae through increasingly land-adapted groups, gaining vascular tissue (Pteridophyta), then seeds (Gymnosperms), and finally fruit-enclosed seeds (Angiosperms) - each step reducing dependence on water for reproduction.
Concept context
Classification of plants from algae to angiosperms. Understanding plant diversity is essential for NEET.