Lesson 11

Why don't plants die when they can't make food?

Lesson Objectives...

Plan and carry out an investigation collecting data of relative concentration of carbon dioxide changes over time in different closed systems to answer the question, Why don’t plants die when they can’t do photosynthesis?
Obtain and evaluate information from scientific texts to clarify the claim that the plant system doesn’t die when it can’t do photosynthesis because the sugars it produced can be stored for later use in the form of starches. The stored food molecules can be used for energy via cellular respiration or for growth.
Construct an explanation by applying scientific ideas and evidence to explain: (1) why a tree that loses leaves in the winter doesn’t die, (2) where it gets its energy during that time, and (3) where it gets the matter to grow new leaves and wood in the spring

Lesson 11 - Science Notebook - Matter Cycling & Photosynthesis Unit

MC - Lesson 11 - Slides

Slide Presentation for Lesson 11...

This is the slide presentation used by your teachers when navigating through Lesson 11.

Analyze the results of the investigation to figure out what is happening with photosynthesis at night.

MC - Lesson 11 - Reading - How do plant (and animal) cells use food?

Plants do cellular respiration. This is how their cells (and our cells) get energy to survive and grow.
If plants make sugar (through photosynthesis) faster than their cells use it for energy (through cellular respiration), they store up that extra food by converting it to starches (or fats). These can be used later for fuel or building blocks.
Plants use their stored food as building blocks by reassembling the atoms in that food to make new substances (e.g., cellulose for cell walls).

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