Some statements are given below each with one or two blanks. Select the option that correctly fills up the blanks.
(i) High concentration of DDT disturbs ____ in birds, which causes ____.
(ii) ____ burns more efficiently as compared to petrol and diesel.
(iii) ___ is the natural ageing of a lake which occurs due to accumulation of ____.
(iv) ______ reduces the number of organisms which are sensitive to high temperature.
(v) Irreparable computers and other electronic goods are known as ____.

Options

A. (i) calcium metabolism, thinning of egg shell (ii) CNG (iii) Eutrophication, nitrates and phosphates (iv) Thermal wastewater (v) electronic waste
B. (i) protein metabolism, thickening of egg shell (ii) CNG (iii) Eutrophication, nitrates and phosphates (iv) Thermal wastewater (v) electronic waste
C. (i) calcium metabolism, thinning of egg shell (ii) Coal (iii) Biomagnification, nitrates and phosphates (iv) Organic wastewater (v) inorganic waste
D. (i) calcium metabolism, thckening of egg shell (ii) CNG (iii) Biomagnification, DDT and mercury (iv) Thermal wastewater (v) electronic waste

Answer

To solve the question, we will fill in the blanks for each statement step by step.

### Step 1: Analyze the first statement
**Statement:** High concentration of DDT disturbs ____ in birds, which causes ____.

**Solution:**
- DDT (Dichlorodiphenyltrichloroethane) is known to disrupt the calcium metabolism in birds. This disturbance leads to the thinning of eggshells, which causes the eggs to break prematurely.
- **Filled statement:** High concentration of DDT disturbs **calcium metabolism** in birds, which causes **thinning of eggshells**.

### Step 2: Analyze the second statement
**Statement:** ____ burns more efficiently as compared to petrol and diesel.

**Solution:**
- Compressed Natural Gas (CNG) is known to burn more efficiently than petrol and diesel.
- **Filled statement:** **CNG** burns more efficiently as compared to petrol and diesel.

### Step 3: Analyze the third statement
**Statement:** ____ is the natural ageing of a lake which occurs due to accumulation of ____.

**Solution:**
- The natural ageing of a lake is referred to as **eutrophication**, which occurs due to the accumulation of nutrients like **nitrates and phosphates**.
- **Filled statement:** **Eutrophication** is the natural ageing of a lake which occurs due to accumulation of **nitrates and phosphates**.

### Step 4: Analyze the fourth statement
**Statement:** ______ reduces the number of organisms which are sensitive to high temperature.

**Solution:**
- **Thermal wastewater** is known to reduce the number of organisms that are sensitive to high temperatures, as it raises the temperature of water bodies.
- **Filled statement:** **Thermal wastewater** reduces the number of organisms which are sensitive to high temperature.

### Step 5: Analyze the fifth statement
**Statement:** Irreparable computers and other electronic goods are known as ____.

**Solution:**
- Irreparable computers and other electronic goods are referred to as **electronic waste** or e-waste.
- **Filled statement:** Irreparable computers and other electronic goods are known as **electronic waste**.

### Final Answers:
1. High concentration of DDT disturbs **calcium metabolism** in birds, which causes **thinning of eggshells**.
2. **CNG** burns more efficiently as compared to petrol and diesel.
3. **Eutrophication** is the natural ageing of a lake which occurs due to accumulation of **nitrates and phosphates**.
4. **Thermal wastewater** reduces the number of organisms which are sensitive to high temperature.
5. Irreparable computers and other electronic goods are known as **electronic waste**.