Read the given statements about auxins and state whether they are true or false :
a. Auxin promotes apical dominance.
b. Auxins have a negative impact on cytokinin levels.
c. F.W went isolated auxins from the coleoptiles of the coleptiles of the oat plant.
d. Auxin promotes flowering in the pineapple plants.

Options

A. a - false, b - false, c-true, d - false
B. a - true, b - false, c - true, d - true
C. a - true, b-false, c - true, d - false
D. a - false, b - true, c - true, d- true

Answer

To determine whether the statements about auxins are true or false, we will analyze each statement one by one.

### Step 1: Analyze Statement A
**Statement A:** Auxin promotes apical dominance.

**Analysis:**
- Auxins are known to promote apical dominance by inhibiting the growth of lateral buds. This means that the main shoot grows more vigorously than the side shoots, which is a characteristic effect of auxins.

**Conclusion:** This statement is **True**.

### Step 2: Analyze Statement B
**Statement B:** Auxins have a negative impact on cytokinin levels.

**Analysis:**
- Auxins and cytokinins are two types of plant hormones that often work in opposition to each other. While auxins promote apical dominance, cytokinins promote lateral growth. However, it is not accurate to say that auxins have a negative impact on cytokinin levels; rather, they can influence their effects in different ways.

**Conclusion:** This statement is **False**.

### Step 3: Analyze Statement C
**Statement C:** F.W. Went isolated auxins from the coleoptiles of the oat plant.

**Analysis:**
- F.W. Went is indeed credited with isolating auxins from the coleoptiles of oat plants. He conducted experiments that demonstrated the polar transport of auxins, which is foundational in understanding how these hormones function in plants.

**Conclusion:** This statement is **True**.

### Step 4: Analyze Statement D
**Statement D:** Auxin promotes flowering in the pineapple plants.

**Analysis:**
- Auxins are known to play a role in promoting flowering in various plants, including pineapple. They can induce flowering under certain conditions, which is utilized in agricultural practices.

**Conclusion:** This statement is **True**.

### Final Summary of Statements
- **Statement A:** True
- **Statement B:** False
- **Statement C:** True
- **Statement D:** True

### Overall Conclusion
The correct assessment of the statements is: **True, False, True, True**.