Mark the correct statements about major abiotic factors .
I . Temperature on land veries seasonally, increase progressively from the equator towards the from plains to the mountain tops .
II. Light is important in animals as they use the diurnal seasonal variations in light intensity and duration as cues for timing their forging, reproductive and migratory activities.
III. Various characteristics of the soil such as soil composition, grain size and aggregation determine the percolation and water holding capacity of the soils .
IV. The salt concentration is more than 5% in inland waters

Options

A. I and III
B. II and III
C. I,II and IV
D. I,III and IV

Answer

To solve the question regarding the correct statements about major abiotic factors, we will analyze each statement one by one.

### Step-by-step Solution:

1. **Statement I: Temperature on land varies seasonally, increases progressively from the equator towards the plains to the mountain tops.**
- **Analysis:** This statement is incorrect. While temperature does vary seasonally, it actually decreases as you move from the equator towards the poles and also decreases from plains to mountain tops due to altitude. Therefore, this statement is false.

2. **Statement II: Light is important in animals as they use the diurnal seasonal variations in light intensity and duration as cues for timing their foraging, reproductive, and migratory activities.**
- **Analysis:** This statement is correct. Many animals rely on light variations (both daily and seasonal) to regulate their behaviors, including foraging, reproduction, and migration. Thus, this statement is true.

3. **Statement III: Various characteristics of the soil such as soil composition, grain size, and aggregation determine the percolation and water holding capacity of the soils.**
- **Analysis:** This statement is also correct. The physical and chemical properties of soil, including its composition, grain size, and how the particles aggregate, significantly influence how water moves through the soil (percolation) and how much water it can retain (water holding capacity). Therefore, this statement is true.

4. **Statement IV: The salt concentration is more than 5% in inland waters.**
- **Analysis:** This statement is incorrect. Inland waters, such as lakes and rivers, typically have a salt concentration of less than 5%. Therefore, this statement is false.

### Conclusion:
- The correct statements are **II and III**.
- Therefore, the correct answer is that statements II and III are true.