Because when it get dry or it's last change of it's life time it's become shrinke and yellow.

In the given cross between a yellow seeded wrinkled pea plant (YYrr) and a green seeded round pea plant (yyRR), the seeds produced in the F1 generation are yellow and round. Let's break down the cross and understand why the answer is option 'A'.

Cross:
Yellow seeded wrinkled pea plant (YYrr) x Green seeded round pea plant (yyRR)

F1 Generation:
The F1 generation is the first filial generation resulting from the cross between the parental (P) generation. In this case, the P generation consists of the yellow seeded wrinkled pea plant (YYrr) and the green seeded round pea plant (yyRR).

To determine the characteristics of the F1 generation, we need to consider the alleles for seed color (yellow or green) and seed shape (wrinkled or round) present in the parent plants.

Alleles:
- Seed color: Yellow (Y) is dominant over green (y).
- Seed shape: Round (R) is dominant over wrinkled (r).

Genotype of Parental Plants:
- Yellow seeded wrinkled pea plant (YYrr): This plant has two dominant alleles for seed color (YY) and two recessive alleles for seed shape (rr).
- Green seeded round pea plant (yyRR): This plant has two recessive alleles for seed color (yy) and two dominant alleles for seed shape (RR).

Genotype of F1 Generation:
When these two plants are crossed, the gametes (reproductive cells) from the P plants combine to form the offspring. In this case, the possible gametes from each parent are:

- Yellow seeded wrinkled pea plant (YYrr): Yr
- Green seeded round pea plant (yyRR): yR

When these gametes combine, the possible genotypes of the F1 generation are:

- YyRr: yellow and round
- YyRR: yellow and round
- yyRr: green and round
- yyRR: green and round

Phenotype of F1 Generation:
The phenotype refers to the physical appearance or observable characteristics of an organism. In this case, the phenotype of the F1 generation will be yellow and round, as the dominant alleles for seed color (Y) and seed shape (R) are present.

Therefore, the correct answer is option 'A' - yellow and round.