Question

Read the following statements.
A) Orobanche is total stem parasite of tomato
B) Cuscuta campestris is total stem parasite of linseed
(C) Loranthus longiflorus is partial stem parasite of mango
D) Broom rape is obligate root parasite of mustard

Choose the correct answer from the options given below:

• A. A, B and D only
• B. A, B and C only
• C. B, C and D only
• D. A, C and D only

Hint:

Use the classic acronym "CLS/O" to remember:
- Cuscuta: Total Stem parasite.
- Loranthus: Partial Stem parasite.
- Striga: Partial Root parasite.
- Orobanche: Total Root parasite.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Parasitic weeds are plants that attach to a host plant via specialized structures called haustoria to extract water, nutrients, or photosynthates. They are classified as stem or root, total or partial parasites.

Step 3: Detailed Explanation:
Let us evaluate each statement:
- Statement A: Orobanche (Broomrape) is a total root parasite of Solanaceous crops (like tomato and tobacco). Stating it is a stem parasite is incorrect. Thus, A is false.
- Statement B: Cuscuta campestris (Dodder) is a total stem parasite that wraps around host stems (such as linseed or alfalfa) to extract nutrients. Thus, B is true.
- Statement C: Loranthus longiflorus is a chlorophyll-containing partial stem parasite that infects woody branches of orchard trees (like mango) to absorb water and minerals. Thus, C is true.
- Statement D: Broomrape (Orobanche) is an obligate root parasite of mustard (Cruciferous crops), causing severe growth stunting. Thus, D is true.
Therefore, statements B, C, and D are correct.

Step 4: Final Answer:
The correct option is 3, which corresponds to B, C and D only.