What will happen if deer is missing in the food chain given below ?
`"Grass"to"Deer"to"Tiger"`

Options

A. The population of tiger increases
B. The population of grass decreases
C. Tiger will start eating grass
D. The population of tiger decreases and the population of grass increases

Explanation

### Step-by-Step Solution:

1. **Understanding the Food Chain**: The food chain provided is "Grass" → "Deer" → "Tiger". In this chain, grass is the producer, deer is the primary consumer (herbivore), and tiger is the secondary consumer (carnivore).

2. **Impact of Deer Removal**: If deer are removed from this food chain, there will be no primary consumer to feed on the grass. This means that the grass will no longer have any herbivores consuming it.

3. **Increase in Grass Population**: With no deer to eat the grass, the population of grass will increase significantly. This is because there will be no grazing pressure from the deer.

4. **Effect on Tigers**: Tigers rely on deer as their primary food source. If deer are missing, tigers will have no food to eat, leading to a decline in their population as they will struggle to find alternative food sources.

5. **Ecosystem Imbalance**: The increase in grass and the decline in tiger population will create an imbalance in the ecosystem. An overabundance of grass may lead to other issues, such as competition among plant species or changes in soil quality.

6. **Conclusion**: Therefore, the absence of deer in the food chain will lead to an increase in grass, a decline in tiger population, and ultimately an imbalance in the ecosystem.