About _______of all insects are known to feed on green plants.

Options

A. half
B. one-fourth
C. one-third
D. two -third

Answer

To solve the question, we need to determine the fraction of all insects that are known to feed on green plants. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Question
The question asks for the fraction of all insects that are known to feed on green plants.

### Step 2: Identify the Term
Insects that feed on plants are referred to as "phytophagous insects." The term "phyto" means plant, and "phagous" means eating.

### Step 3: Gather Information
It is noted that phytophagous insects include various species that feed on different parts of plants such as roots, stems, leaves, flowers, and fruits.

### Step 4: Determine the Proportion
According to the information provided, it is stated that approximately 25% of known multicellular animals are phytophagous insects.

### Step 5: Convert Percentage to Fraction
25% can be expressed as a fraction:
- 25% = 25/100 = 1/4

### Step 6: Choose the Correct Option
From the options provided (half, one-fourth, one-third, and two-third), the correct answer that corresponds to 25% is "one-fourth."

### Final Answer
About **one-fourth** of all insects are known to feed on green plants.

---