Match List I with List II –

List I		List II
A	Phalaris minor	I. Summer annual
B	Amaranthus viridis	II. Perennial
C	Cynodon dactylon	III. Aquatic
D	Salvinia	IV. Winter annual

Correct option is A

The correct answer is (A) A-IV, B-I, C-II, D-III

Explanation:
• Phalaris minor (A), commonly known as little seed canary grass, is a major Winter annual (IV) weed in wheat fields.
• Amaranthus viridis (B), known as slender amaranth, is a common Summer annual (I) weed.
• Cynodon dactylon (C), commonly known as Bermuda grass or Dhub grass, is a hardy Perennial (II) weed that persists year-round.
• Salvinia (D) is a genus of floating fern, which is an Aquatic (III) weed.

Information Booster:
• Weeds are categorized by their life cycle: Annuals (one season), Biennials (two seasons), and Perennials (more than two seasons).
• Phalaris minor has developed significant resistance to herbicides like isoproturon in India.

Additional Knowledge:
• Aquatic weeds like Salvinia and Water Hyacinth can clog waterways and deplete oxygen, harming fish populations.
• Cynodon dactylon is also used as a lawn grass and for soil erosion control, demonstrating that a plant is only a 'weed' when it's in the wrong place.