Question

two main functions of stems are to ______.
a. move materials and support plant parts
b. furnish food for humans and other animals
c. manufacture food and store it for future use
d. store food and convert it to starches

Explanation:

To determine the two main functions of plant stems, we analyze each option:

• Option a: Stems have vascular tissues (xylem and phloem) that transport water, nutrients, and food (move materials) and also provide structural support to hold up leaves, flowers, etc. (support plant parts). This aligns with known stem functions.
• Option b: Furnishing food for humans/animals is not a main function of stems; leaves (via photosynthesis) and roots (storage) play more direct roles in food production/storage for others.
• Option c: Manufacturing food is done by leaves (photosynthesis), not stems. Stems may store food but don't manufacture it.
• Option d: Storing food and converting to starches is more related to roots or some specialized stems (like tubers), but the primary functions of typical stems are transport and support, not this conversion/storage as a main role.

Answer:

a. move materials and support plant parts