Stomata are tiny pores on the underside of a leaf, each surrounded by two guard cells. Open stomata let carbon dioxide in for photosynthesis and let water vapor out in transpiration.

Why do plants lose water through their leaves?

Water vapor leaves through open stomata, and this loss is called transpiration. Stomata, Transpiration and Water Loss Data compares plants in shade, in sun and in sun with wind.

7th Grade Photosynthesis and Respiration Worksheets

Ages 12-13 · Free previews · Print-ready PDFs

Written by Adi Ackerman, Head Teacher

Photosynthesis is how plants use light, water and carbon dioxide to build food, and it explains where a plant's mass comes from. There are 2 sheets for 7th grade here, each with an answer key. Where Plant Mass Comes From follows the willow tree experiment of Jan Baptist van Helmont and has students count atoms in the equation. Stomata, Transpiration and Water Loss Data has students graph three sets of sample data on water lost by a plant. One sheet practices MS-LS1-6.

7th Grade Science Living Things Photosynthesis and respiration Clear All

Stomata, Transpiration and Water Loss Data

Grade7th Grade

TopicLiving Things

Where Plant Mass Comes From

Grade7th Grade

TopicLiving Things

More living things worksheets

Explore all of our 7th grade living things worksheets, covering reproduction and plant growth, natural selection and adaptations, cells, heredity, and more.

Reproduction and plant growth Natural selection and adaptations Cells Heredity Human body systems

Frequently Asked Questions

Van Helmont's willow gained about 164 pounds while the dried soil lost only about 2 ounces, so the soil was not the main source. The tree built its mass from water and from carbon dioxide in the air. Where Plant Mass Comes From has students count the atoms in the photosynthesis equation.

What is ClassWeekly?

ClassWeekly offers free worksheets and printable learning resources for kids, from preschool up. All worksheets are aligned to Common Core, NGSS, and C3 Framework standards and designed by educators. Become a member to access the full library and download unlimited PDFs.