Tropisms help plants survive by enabling them to grow toward essential resources and away from unfavorable conditions. Specifically, the most relevant option from your list is:
Plants grow toward things they need.
This includes phototropism (growth toward light), gravitropism (growth in response to gravity), and hydrotropism (growth toward water). By orienting themselves toward light, nutrients, and water, plants can optimize their chances of survival and reproduction. This adaptive growth behavior helps them maximize photosynthesis, access necessary resources, and enhance their overall resilience in various environments.
The other options, while they describe aspects of plant life, do not directly relate to the concept of tropisms. For instance, plants indeed produce their own food using chlorophyll through photosynthesis, but this process is more about energy production rather than the directional growth response associated with tropisms.