Which of the following is/are incorrect ?
(A) In nature food chain exist not food web
(B) Gene flow occur between two different population
(C) Flow of energy in ecosystem is linear
(D) All ecosystem are constant in size.
(E) Plants capture onlt 2-10% of the PAR

Options

A. A, C
B. A, D, E
C. A, B, D
D. C & E

Answer

To determine which statements are incorrect, let's analyze each statement one by one:

**Step 1: Analyze Statement A**
- Statement A: "In nature, food chains exist, not food webs."
- Analysis: This statement is incorrect. In nature, both food chains and food webs exist. Food webs represent the complex interconnections between different food chains and provide a more accurate depiction of feeding relationships in ecosystems.

**Step 2: Analyze Statement B**
- Statement B: "Gene flow occurs between two different populations."
- Analysis: This statement is also incorrect. Gene flow typically occurs within the same population, not between different populations, especially if they are geographically isolated. Gene flow refers to the transfer of genetic material between populations of the same species.

**Step 3: Analyze Statement C**
- Statement C: "Flow of energy in the ecosystem is linear."
- Analysis: This statement is incorrect. The flow of energy in an ecosystem is not strictly linear; it is more complex and can be described as a network of energy transfer. Energy flows from producers to consumers and decomposers in a more interconnected manner.

**Step 4: Analyze Statement D**
- Statement D: "All ecosystems are constant in size."
- Analysis: This statement is incorrect. Ecosystems can vary in size and are not constant. They can range from small micro-ecosystems to large macro-ecosystems, such as forests or oceans, and their sizes can change over time due to various environmental factors.

**Step 5: Analyze Statement E**
- Statement E: "Plants capture only 2-10% of the PAR."
- Analysis: This statement is correct. Plants capture a small percentage (2-10%) of the photosynthetically active radiation (PAR) from sunlight for photosynthesis.

**Final Conclusion:**
The incorrect statements are A, B, C, and D. The only correct statement is E.

### Summary of Incorrect Statements:
- A: Incorrect
- B: Incorrect
- C: Incorrect
- D: Incorrect
- E: Correct