1. sugar beets plants start from tiny seeds and grow to be large plants. where does the bulk of their mass come from? a. nutrients absorbed from the soil b. carbon dioxide taken in from the surrounding air c. sugars absorbed from the soil d. oxygen taken in from the surrounding air 2. in what part of the beet pant is the excess sucrose stored? a. root b. leaves c. stem

1.  B. carbon dioxide taken in from the surrounding air

2. A. Root

Explanation:

Sugar beet plant carries out photosynthesis and stores the excess of the sucrose in its taproots. During the process of photosynthesis, the plant absorbs CO2 from the air, water from the soil and synthesizes organic sugars in the presence of sunlight.

Atmospheric CO2 contributes carbon and oxygen atoms to the formed sugars which in turn are stored in plant parts. Therefore, atmospheric CO2 makes most of the mass of the photosynthesizing plants such as sugar beets. The taproots of beet plants are modified into storage roots to store the excess of the organic sugars.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.