One of the following statements is incorrect with reference of biodiversity. Identify it.

Options

A. The areas with very few plant and animal species (low species richness) with no threatened species are called biodiversity hotspots.
B. Biodiversity increases from higher altitudes to lower altitudes.
C. Biodiversity decreases from the equator to polar regions.
D. Depletion in genetic diversity of crop plants is mainly due to the introduction of better varieties with high yield, disease resistance, etc.

Answer

To solve the question about identifying the incorrect statement regarding biodiversity, we will analyze each statement provided. Here are the steps to arrive at the solution:

### Step 1: Understand the Definition of Biodiversity Hotspots
Biodiversity hotspots are regions that are rich in species diversity, particularly in endemic species, and are under significant threat from human activities.

**Hint:** Remember that biodiversity hotspots are characterized by high species richness and endemism, not low species richness.

### Step 2: Analyze the First Statement
The first statement claims that areas with very few plants and animal species, low species richness, and no threatened species are called biodiversity hotspots. This is incorrect because biodiversity hotspots are defined by high species richness and significant threats to those species.

**Hint:** Look for keywords like "few species" and "no threatened species" in the statement to identify its inaccuracy.

### Step 3: Evaluate the Second Statement
The second statement mentions that biodiversity increases from higher altitudes to lower altitudes. This is generally true as lower altitudes tend to have more diverse ecosystems.

**Hint:** Consider how altitude affects climate and habitat diversity.

### Step 4: Assess the Third Statement
The third statement states that biodiversity decreases from the equator to the polar regions. This is also correct, as tropical regions near the equator typically have higher biodiversity compared to polar regions.

**Hint:** Think about how temperature and climate influence species diversity across different latitudes.

### Step 5: Review the Fourth Statement
The fourth statement discusses the depletion of genetic diversity in crop plants due to the introduction of better varieties. This is accurate as the focus on high-yield varieties can lead to a loss of traditional varieties.

**Hint:** Reflect on agricultural practices and their impact on genetic diversity.

### Conclusion
After analyzing all the statements, the first statement is identified as incorrect regarding biodiversity hotspots. Therefore, the answer is:

**Answer:** Option number one.