(I) The formation of microspore from microspore mother cells by meiosis is called ........a .......
(II) Formation of megaspore from megaspore mother cell by meiosis is called .......b...........
(III ) The formation of male gamete from generative cell by mitosis is called ...........c.......
(IV ) The formation of a zygote by the fusion of male and female gametes is called ......... d.........
Write correct terms for a, b, c and d.

Options

A. `{:(A,B,C,D),("Megasporagenesis","Microsporogenesis","Fertilization","Gametogenesis"):}`
B. `{:(A,B,C,D),("Microsporogenesis","Megasporagenesis","Microgametogenesis","Fertilization"):}`
C. `{:(A,B,C,D),("Microgametogenesis","Megasporagenesis","Microsporogenesis","Syngamy"):}`
D. `{:(A,B,C,D),("Syngamy","Microgametogenesis","Microsporogenesis","Microgametogenesis"):}`

Answer

To solve the question, we need to fill in the blanks with the correct biological terms related to the processes of gamete formation and fertilization. Let's go through each statement step by step:

### Step 1: Identify the process for (I)
The first statement is about the formation of microspores from microspore mother cells through meiosis. This process is known as **microsporogenesis**.

**Answer for (I): a = microsporogenesis**

### Step 2: Identify the process for (II)
The second statement refers to the formation of megaspores from megaspore mother cells via meiosis. This process is called **megasporogenesis**.

**Answer for (II): b = megasporogenesis**

### Step 3: Identify the process for (III)
The third statement discusses the formation of male gametes from generative cells through mitosis. This process is termed **microgametogenesis**.

**Answer for (III): c = microgametogenesis**

### Step 4: Identify the process for (IV)
The final statement describes the formation of a zygote by the fusion of male and female gametes. This process is known as **fertilization**.

**Answer for (IV): d = fertilization**

### Final Answers:
- a = microsporogenesis
- b = megasporogenesis
- c = microgametogenesis
- d = fertilization