Based on the student's investigation, the effect of root space on plant growth shows that deeper containers allow plants to grow taller. In the table, Group A, which was grown in 3 cm deep containers, had average heights of 2 cm at Week 1 and grew to 10 cm by Week 6. In contrast, Group B, which was grown in 10 cm deep containers, started at 3 cm in Week 1 and grew to 18 cm by Week 6. This suggests that plants in deeper containers can access more root space, which helps them grow taller.
For example, by Week 6, Group A plants were only 10 cm tall, while Group B plants were 18 cm tall, showing a clear difference in growth. The deeper container likely provided more nutrients and better space for the roots, leading to healthier and taller plants.
To know whether this effect was due to the environment (like the containers and soil) or genetic factors (inherited traits of the plants), we would need to do a few things. First, we should make sure both groups of plants are the same type, which they are, since they are the same variety. Then we would have to check if the plants received the same water and sunlight, which they did. If all other conditions were the same and only the depth of the containers changed, it suggests that the difference in growth was likely because of the root space rather than any genetic differences.
So, the deeper containers gave the plants in Group B more room to grow their roots, which helped them become taller and healthier compared to the plants in Group A.