Which of the following statements is incorrect?

Options

A. All animals do not depend directly on plants for their food needs.
B. The death of the organism is the beginning of the grazing food chain.
C. Those animals that depends on the primary carnivores for food are labeled as tertiary consumers.
D. Primary producers in an aquatic ecosystem are various species like phytoplanktons, algae and higher plants.

Answer

To solve the question of which statement is incorrect, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1: All animals do not depend directly on plants for their food needs.**
- This statement is correct. While many animals (herbivores) eat plants directly, carnivores depend on herbivores for their food. Therefore, not all animals rely directly on plants.

2. **Statement 2: The death of the organism is the beginning of the grazing food chain.**
- This statement is incorrect. The grazing food chain starts with producers (plants) and not with the death of organisms. The food chain that begins with dead organic matter is called the detritus food chain.

3. **Statement 3: Those animals that depend on the primary carnivores are labeled as tertiary consumers.**
- This statement is correct. Tertiary consumers are indeed those that feed on primary carnivores (secondary consumers).

4. **Statement 4: Primary producers in an aquatic system are various species like phytoplanktons, algae, and higher plants.**
- This statement is correct. In aquatic ecosystems, primary producers include phytoplankton, algae, and other aquatic plants that perform photosynthesis.

### Conclusion:
The incorrect statement is **Statement 2**: "The death of the organism is the beginning of the grazing food chain."

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