Plant Structure & Adaptations

Why are plants important for life on Earth?

• As producers, they are the main support for food webs.

• Many of our medicines come from plants.

• They produce oxygen for us to breathe through photosynthesis.

• All of these are true.

In humans, the vascular tissues are veins, arteries, and other blood vessels.

What are the vascular tissues in plants?

• Xylem and phloem.

• Roots and shoots.

• Veins and arteries.

• Stomata and chloroplasts.

Which is a major difference between xylem and phloem?

• Xylem carries water upwards and phloem carries nutrients throughout the plant.

• Xylem carries nutrients throughout the plant and phloem carries water upwards.

• Xylem can only carry water downwards while phloem can only carry water upwards.

• Xylem is only found in nonvascular plants while phloem is only found in vascular plants.

Which is an example of a nonvascular plant?

• Moss

• Grass

• Flower

• Tree

What is a key difference between vascular and nonvascular plants?

• Vascular plants have xylem and phloem; nonvascular plants do not.

• Nonvascular plants have xylem and phloem; vascular plants do not.

• Vascular plants are multicellular; nonvascular plants are unicellular.

• Vascular plants are eukaryotic; nonvascular plants are prokaryotic.

Photosynthesis is:

• The ability to make sugar from sunlight.

• The abililty to make oxygen from carbon dioxide.

• The ability to make carbon dioxide from oxygen.

• The ability to make oxygen from sunlight.

What are the three reactants photosynthesis needs?

• Water, light, and carbon dioxide.

• Water, oxygen, and carbon dioxide.

• Water, light, and oxygen.

• Water, oxygen, and nitrogen.

Which organelles within plant cells allow them to conduct photosynthesis?

• Chloroplasts

• Mitochondria

• Cellulose

• Nucleus

What are the tiny pores in leaves that let in carbon dioxide and let out water?

• Stomata

• Chloroplasts

• Mitochondria

• Leaves

Why would a plant close its stomata?

• To conserve water.

• To conduct photosynthesis.

• To conduct cell respiration.

• For no reason.