If the chromosome number in the root cell of Zea mays is 20 , then what would be the chromosome number in the cell of (i) radicle, (ii) hypocotyls , (iii) epiblast , (iv) aleurone layer and (v) scutellum, respectively ?
`{:(,(i),(ii),(iii),(iv),(v)),((1),20,30,20,30,20),((2),20,20,20,30,20),((3),20,30,30,30,20),((4),20,20,20,20,20):}`

Options

A. `(1)`
B. `(2)`
C. `(3)`
D. `(4)`

Answer

To solve the question regarding the chromosome number in different parts of Zea mays (corn), we start with the information given: the chromosome number in the root cell is 20. This indicates that the root cells are diploid, meaning they have two sets of chromosomes.

### Step-by-Step Solution:

1. **Understanding Chromosome Number in Root Cells**:
- The root cells of Zea mays have a chromosome number of 20, which is diploid (2n = 20).

2. **Chromosome Number in Radicle**:
- The radicle is part of the embryo and is also diploid. Therefore, the chromosome number in the radicle is 20.

3. **Chromosome Number in Hypocotyl**:
- The hypocotyl is another part of the embryo and, like the radicle, is diploid. Thus, the chromosome number in the hypocotyl is also 20.

4. **Chromosome Number in Epiblast**:
- The epiblast is part of the seed and is diploid as well. Therefore, the chromosome number in the epiblast is 20.

5. **Chromosome Number in Aleurone Layer**:
- The aleurone layer is part of the endosperm, which is typically triploid in flowering plants. Therefore, the chromosome number in the aleurone layer is 30 (3n = 30).

6. **Chromosome Number in Scutellum**:
- The scutellum is also part of the embryo and is diploid. Thus, the chromosome number in the scutellum is 20.

### Summary of Chromosome Numbers:
- Radicle: 20
- Hypocotyl: 20
- Epiblast: 20
- Aleurone Layer: 30
- Scutellum: 20

### Final Answer:
The chromosome numbers in the respective parts are:
- (i) Radicle: 20
- (ii) Hypocotyl: 20
- (iii) Epiblast: 20
- (iv) Aleurone Layer: 30
- (v) Scutellum: 20

Thus, the correct option is **(2)**: 20, 20, 20, 30, 20.