Question

question 19 (2.5 points)
how does the wheat stem rust fungus harm its host plant?
by blocking the flow of water through the plant
it interferes with the photosynthetic process
it absorbs plant sugars made in photosynthesis
it causes the roots to rot
it interferes with flowering
question 20 (2.5 points)
fungal cell walls consist primarily of _

Explanation:

Wheat stem rust fungus is a parasitic organism. Parasitic fungi often obtain nutrients from the host. In plants, photosynthesis produces sugars (like glucose). The wheat stem rust fungus absorbs the plant sugars made in photosynthesis, depriving the plant of its energy - rich compounds. Blocking water flow is more characteristic of some vascular - clogging pathogens (but not typical for this fungus). Interfering with photosynthesis is not the main mode of harm here (it's more about nutrient absorption). Root rot is not the typical symptom of wheat stem rust (it affects stems and leaves more prominently in the early stages), and interference with flowering is not the primary harmful mechanism compared to sugar absorption.

Answer:

it absorbs plant sugars made in photosynthesis