Read the following statements.
(a) Optic lobes in humans are represented by two inferior colliculi of mid-brain.
(b) Destruction of GABA secreting neurons leads to Parkinson's while Huntington's chorea is caused due to degeneration of dopamine secreting neurons.
(c) Human brain is greatly convoluted, consisting of numerous gyri and sulci.
(d) Amygdala is concerned with regulating moods, especially anger and rage.

Answer

To determine the correctness of the statements provided, we will analyze each one step by step.

### Step 1: Analyze Statement (a)
**Statement:** Optic lobes in humans are represented by two inferior colliculi of mid-brain.

**Analysis:**
- The optic lobes in humans are not represented by the inferior colliculi. Instead, they are represented by the superior colliculi and inferior colliculi collectively known as the quadrigeminal bodies (or tectum) in the midbrain.
- **Conclusion:** This statement is **incorrect**.

### Step 2: Analyze Statement (b)
**Statement:** Destruction of GABA secreting neurons leads to Parkinson's while Huntington's chorea is caused due to degeneration of dopamine secreting neurons.

**Analysis:**
- Parkinson's disease is primarily associated with the degeneration of dopamine-secreting neurons, particularly in the substantia nigra.
- Huntington's chorea is linked to the degeneration of GABA (gamma-aminobutyric acid) secreting neurons in the basal ganglia.
- **Conclusion:** This statement is **incorrect**.

### Step 3: Analyze Statement (c)
**Statement:** Human brain is greatly convoluted, consisting of numerous gyri and sulci.

**Analysis:**
- The human brain is indeed highly convoluted, characterized by many folds (gyri) and grooves (sulci). This convoluted structure increases the surface area of the cerebral cortex, allowing for a greater number of neurons.
- **Conclusion:** This statement is **correct**.

### Step 4: Analyze Statement (d)
**Statement:** Amygdala is concerned with regulating moods, especially anger and rage.

**Analysis:**
- The amygdala is a key structure in the limbic system and is indeed involved in the processing of emotions, including fear, anger, and aggression. It plays a significant role in emotional regulation.
- **Conclusion:** This statement is **correct**.

### Final Conclusion:
- Statements (a) and (b) are **incorrect**.
- Statements (c) and (d) are **correct**.