Consider the following stages
1. Spermogonial 2. Aecial
3. Uredial 4. Telial
5. Basidial
The correct sequene of these stages in the life-cycle of Puccinia graminis tritici is

Options

A. 2,1,4,3,5
B. 1,2,4,5,3
C. 1,2,3,4,5
D. 2,1,4,5,3

Answer

To determine the correct sequence of the stages in the life cycle of Puccinia graminis tritici, we need to understand the progression of its life cycle, which consists of five distinct stages. Here’s a step-by-step breakdown:

### Step 1: Identify the stages
The stages provided are:
1. Spermogonial
2. Aecial
3. Uredial
4. Telial
5. Basidial

### Step 2: Understand the life cycle
Puccinia graminis tritici is a macrocyclic rust fungus that has a complex life cycle involving two hosts: wheat (the primary host) and barberry (the secondary host).

### Step 3: Sequence the stages
- **Spermogonial Stage**: This is the first stage where spermatia are produced. It occurs on the primary host (wheat).
- **Aecial Stage**: Following the spermogonial stage, the aecial stage produces aeciospores, which are formed on the primary host.
- **Uredial Stage**: Next, the uredial stage forms urediniospores, which are responsible for repeated infections on the primary host.
- **Telial Stage**: This stage forms teliospores, which are produced in unfavorable conditions and are the resting spores.
- **Basidial Stage**: Finally, in the basidial stage, meiosis occurs to produce haploid basidiospores, which are then carried by the wind to infect the secondary host (barberry).

### Step 4: Compile the correct sequence
Based on the above understanding, the correct sequence of the stages in the life cycle of Puccinia graminis tritici is:
1. Spermogonial
2. Aecial
3. Uredial
4. Telial
5. Basidial

### Final Answer
The correct sequence is: **1, 2, 3, 4, 5**.

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