B3 Gas exchange in plants
Quiz
•
Science
•
12th Grade
•
Practice Problem
•
Medium
Standards-aligned
Steven Varty
Used 10+ times
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28 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which cell type in the leaf is packed with chloroplasts for photosynthesis?
Answer explanation
Palisade mesophyll cells are packed with chloroplasts and are specialized for photosynthesis. Spongy mesophyll cells, while also containing chloroplasts, are more involved in gas exchange. Guard cells regulate stomata, and the epidermis provides protection.
Tags
NGSS.MS-LS1-6
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which structure in the leaf is primarily responsible for gas exchange?
Answer explanation
Stomata are tiny pores that facilitate gas exchange. Vascular tissue transports nutrients, mesophyll tissue contains photosynthetic cells, and guard cells regulate stomatal opening.
Tags
NGSS.MS-LS1-6
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary function of the spongy mesophyll?
Answer explanation
The spongy mesophyll facilitates gas exchange with its air spaces. While it does participate in photosynthesis, its structure is optimized for gas movement. Water transport and nutrient storage are handled by other tissues.
Tags
NGSS.MS-LS1-6
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which cells regulate the opening and closing of stomata?
Answer explanation
Guard cells are responsible for regulating stomatal openings through changes in turgor pressure. Palisade and spongy cells are involved in photosynthesis and gas exchange, while epidermal cells protect the leaf surface.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to guard cells when they become turgid?
Answer explanation
When guard cells become turgid, they swell and cause the stomata to open, allowing for gas exchange. When they lose turgor, the stomata close. Water loss and photosynthesis are related processes but not directly affected by turgidity alone.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which part of the leaf contains xylem and phloem?
Answer explanation
Vascular tissue contains xylem and phloem, which transport water, nutrients, and food. The epidermis protects, the mesophyll aids in photosynthesis and gas exchange, and stomata facilitate gas exchange.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which leaf adaptation reduces water loss?
Answer explanation
The waxy cuticle forms an impermeable barrier to reduce water loss while allowing gases to pass through stomata. A large surface area and air spaces are adaptations for gas exchange, not water conservation.
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