BIOLOGY II EXAM #2 - PRACTICE QUESTIONS COMPLETE WITH 100% CORRECT ANSWERS

BIOLOGY II EXAM #2 - PRACTICE QUESTIONS COMPLETE WITH 100% CORRECT ANSWERS 1. Which of the following is NOT one of the four major types of plant organ systems? A. Reproductive organs B. Leaf C. Flowers D. Roots Correct Answer: C. Flowers Rationale: The four major types of plant organ systems are reproductive organs, leaf, stem, and roots. Flowers are reproductive structures but are not considered one of the four major organ system categories. ________________________________________ 2. Why are vascular plants better able to sustain photosynthesis than bryophytes? A. Vascular plants have larger leaves for capturing sunlight B. Vascular plants have root systems that help them take up water from the ground C. Vascular plants produce more chlorophyll D. Vascular plants have thicker cell walls Correct Answer: B. Vascular plants have root systems that help them take up water from the ground Rationale: Water is needed for photosynthesis. Bryophytes (nonvascular plants) can only rely on water on the surface, while vascular plants can access water through their root systems. ________________________________________ 3. Where does photosynthesis primarily occur in a plant? A. Stem B. Roots C. Leaf D. Flowers Correct Answer: C. Leaf Rationale: The leaf is the primary site of photosynthesis in plants, containing specialized tissues like mesophyll with photosynthetic cells. ________________________________________ 4. What is transpiration? A. The uptake of water through roots B. The loss of water vapor from leaves C. The production of carbohydrates D. The movement of sugars through phloem Correct Answer: B. The loss of water vapor from leaves Rationale: Transpiration is specifically defined as the loss of water vapor from leaves through stomata. ________________________________________ 5. Why do plants transpire? A. To cool themselves down B. To release excess oxygen C. To enable CO2 uptake for the Calvin Cycle D. To eliminate waste products Correct Answer: C. To enable CO2 uptake for the Calvin Cycle Rationale: CO2 uptake leads to carbon atoms being used to produce carbohydrates in the Calvin Cycle, which results in water loss as a trade-off. ________________________________________ 6. Why are transpiration rates very high? A. The water vapor concentration gradient is very steep B. Plants have no control over water loss C. The CO2 concentration difference driving diffusion into the leaf is much smaller than the concentration difference driving water out D. Stomata are always open Correct Answer: C. The CO2 concentration difference driving diffusion into the leaf is much smaller than the concentration difference driving water out Rationale: The concentration gradient driving water out of the cell is much larger than the gradient driving CO2 into the leaf, resulting in high transpiration rates. ________________________________________ 7. Which of the following is NOT one of the three major tissues of the leaf? A. Dermal tissue B. Ground tissue C. Meristem tissue D. Vascular tissue Correct Answer: C. Meristem tissue Rationale: The three major tissues of the leaf are dermal tissue, ground tissue, and vascular tissue. Meristem tissue is not a major leaf tissue type. ________________________________________ 8. The epidermis is an example of which type of leaf tissue? A. Vascular tissue B. Ground tissue C. Meristem tissue D. Dermal tissue Correct Answer: D. Dermal tissue Rationale: The epidermis is the outermost layer of cells and is classified as dermal tissue. ________________________________________ 9. Mesophyll is an example of which type of leaf tissue? A. Dermal tissue B. Ground tissue C. Vascular tissue D. Epidermal tissue Correct Answer: B. Ground tissue Rationale: Mesophyll is tissue of loosely packed photosynthetic cells and is classified as ground tissue. ________________________________________ 10. Xylem and phloem are examples of which type of leaf tissue? A. Dermal tissue B. Ground tissue C. Vascular tissue D. Epidermal tissue Correct Answer: C. Vascular tissue Rationale: Xylem and phloem form the vascular system of conduits within the leaf and are classified as vascular tissue. ________________________________________ 11. How do plants sustain such high rates of water loss? A. By storing water in their leaves B. By obtaining water from the soil C. By reducing photosynthesis D. By closing stomata during the day Correct Answer: B. By obtaining water from the soil Rationale: Plants sustain high rates of water loss by continuously obtaining water from the soil through their root systems. ________________________________________ 12. Which two structures help minimize water loss in plants? A. Stomata and guard cells B. Stomata and waxy cuticle C. Waxy cuticle and mesophyll D. Guard cells and mesophyll Correct Answer: B. Stomata and waxy cuticle