In biotic community, the most imporatant factor for survival of an animal is

Options

A. Day length
B. Soil moisture
C. Green food
D. Predators

Answer

### Step-by-Step Solution:

1. **Understanding the Biotic Community**:
- A biotic community consists of all the living organisms in an ecosystem, including plants, animals, and microorganisms.

2. **Identifying Components of an Ecosystem**:
- Ecosystems are made up of two main components: abiotic (non-living) and biotic (living). The abiotic components include elements like air, water, and soil, while the biotic components include all living organisms.

3. **Recognizing Interactions in the Biotic Community**:
- Organisms within a biotic community interact with one another for survival. These interactions can be predatory, competitive, or symbiotic.

4. **Determining Basic Survival Needs**:
- The most fundamental requirement for the survival of any organism is food. Without food, no organism can survive.

5. **Understanding the Food Chain**:
- The food chain begins with producers (plants), which are capable of photosynthesis. They form the base of the food chain, providing energy and nutrients to herbivores (primary consumers) and subsequently to carnivores (secondary consumers).

6. **Analyzing the Given Options**:
- The options provided are:
- Day length
- Soil moisture
- Green food
- Predators
- Among these, "green food" refers to the plants that produce energy through photosynthesis.

7. **Concluding the Most Important Factor**:
- Since all animals ultimately depend on plants for food (either directly or indirectly), green food is the most crucial factor for the survival of animals in a biotic community.

### Final Answer:
The most important factor for the survival of an animal in a biotic community is **green food**.

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