Question

a plants growth response to gravity (roots grown down, stems grow up). chitin cellulose angiosperm gravitropism

Explanation:

The question describes a plant's growth response to gravity. Chitin is a polysaccharide found in fungi and arthropods. Cellulose is a structural polysaccharide in plant cell walls. Angiosperm refers to flowering plants. Gravitropism is the growth response of plants to gravity, which matches the description (roots grow down - positive gravitropism, stems grow up - negative gravitropism).

Answer:

Gravitropism