Question

station 11: molecules of cell energy

1. complete the grid with the number of atoms of each type of element each substance has.

	carbon atoms in 1 molecule	oxygen atoms in 1 molecule	hydrogen atoms in 1 molecule
oxygen o₂
carbon dioxide co₂
water h₂o

1. what is a stomata in plants? what do stomata do for plants?
2. how does a plant get water for photosynthesis?

Explanation:

Question 36

Step1: Analyze Glucose ($\ce{C6H12O6}$)

The subscript of C is 6, O is 6, H is 12. So carbon atoms: 6, oxygen atoms: 6, hydrogen atoms: 12.

Step2: Analyze Oxygen ($\ce{O2}$)

No C or H, O subscript is 2. So carbon: 0, oxygen: 2, hydrogen: 0.

Step3: Analyze Carbon Dioxide ($\ce{CO2}$)

C subscript 1, O subscript 2, no H. So carbon: 1, oxygen: 2, hydrogen: 0.

Step4: Analyze Water ($\ce{H2O}$)

No C, O subscript 1, H subscript 2. So carbon: 0, oxygen: 1, hydrogen: 2.

Stomata are small pores (usually on leaf undersides) in plants. They regulate gas exchange (take in $\ce{CO2}$ for photosynthesis, release $\ce{O2}$ and water vapor) and control water loss (transpiration).

Plants absorb water from soil via roots (root hairs increase surface area). Water moves up stem (xylem) to leaves (for photosynthesis) via capillary action, transpiration pull, and root pressure.

Answer:

Substance	Carbon Atoms	Oxygen Atoms	Hydrogen Atoms
Oxygen $\ce{O2}$	0	2	0
Carbon Dioxide $\ce{CO2}$	1	2	0
Water $\ce{H2O}$	0	1	2

Question 37