Multiple Choice Questions (MCQs) About the Significance of Secondary Growth in Plants
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What is secondary growth in plants?
- A. Increase in height
- B. Increase in girth and thickness
- C. Photosynthesis
- D. Root development
Answer: B
Explanation: Secondary growth refers to the increase in girth and thickness of a plant, differentiating it from primary growth, which focuses on height.
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Which tissues play a central role in secondary growth?
- A. Xylem and Phloem
- B. Epidermis
- C. Meristem
- D. Cortex
Answer: C
Explanation: Cambium tissues are crucial in secondary growth, dividing and differentiating to form new layers of vascular tissues.
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What is the primary purpose of secondary growth in plants?
- A. Enhanced structural support
- B. Faster photosynthesis
- C. Root elongation
- D. Leaf development
Answer: A
Explanation: Secondary growth provides enhanced structural support, especially for long-lived and tall plant species.
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Which growth phase is responsible for the elongation of roots and stems?
- A. Secondary growth
- B. Tertiary growth
- C. Primary growth
- D. Extra growth
Answer: C
Explanation: Primary growth is responsible for the elongation of roots and stems, focusing on increasing height.
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What environmental stimuli can plants with secondary growth better respond to?
- A. Temperature changes
- B. Light intensity
- C. Both A and B
- D. Rainfall
Answer: C
Explanation: Plants with secondary growth often exhibit heightened adaptability to temperature changes and variations in light intensity.
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Which economic sector benefits from secondary growth in plants?
- A. Information technology
- B. Agriculture and horticulture
- C. Fashion industry
- D. Pharmaceutical industry
Answer: B
Explanation: Agriculture and horticulture benefit from knowledge about secondary growth for optimizing crop yields and landscaping.
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What does the cambium tissue do during secondary growth?
- A. produces energy
- B. divides and differentiates
- supports the plant structure
- D. aids in photosynthesis
Answer: B
Explanation: Cambium tissues divide and differentiate, forming new layers of vascular tissues during secondary growth.
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How does secondary growth contribute to woody plant formation?
- A. Enhances root development
- B. forms new leaves
- C. Creates durable wood
- D. increases flower production
Answer: C
Explanation: Secondary growth is responsible for the formation of durable wood in woody plants.
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What environmental factors can challenge secondary growth?
- A. Increased carbon dioxide levels
- B. Pollution
- C. Both A and B
- D. Ozone layer depletion
Answer: C
Explanation: Environmental factors like increased carbon dioxide levels and pollution can pose challenges to secondary growth.
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Why is understanding the differences between primary and secondary growth important?
- A. To confuse botanists
- B. for comprehensive plant biology understanding
- C. Just for academic interest
- D. It has no significance.
Answer: B
Explanation: Understanding the differences between primary and secondary growth is crucial for a comprehensive understanding of plant biology.
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Which human activity negatively impacts secondary growth in plants?
- A. Afforestation
- B. Sustainable forestry practices
- C. Deforestation
- D. Conservation efforts
Answer: C
Explanation: Deforestation, the removal of large forested areas, negatively impacts secondary growth in plants.
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What role does secondary growth play in the economic sector?
- A. supports the technology industry
- B. Enhances fashion trends
- C. Contributes to wood-based industries
- D. Aids in pharmaceutical research
Answer: C
Explanation: Secondary growth contributes to wood-based industries, providing resources for various economic sectors.
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Which tissues are developed through secondary growth to enhance water conduction?
- A. Epidermis
- B. Xylem and Phloem
- C. Meristem
- D. Cortex
Answer: B
Explanation: Secondary growth leads to the development of xylem and phloem tissues, enhancing water conduction.
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What is the primary function of primary growth in plants?
- A. Increase in girth and thickness
- B. Enhanced structural support
- C. Elongation of roots and stems
- D. Formation of durable wood
Answer: C
Explanation: Primary growth focuses on the elongation of roots and stems, contributing to increased height.
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How do shrubs and vines differ in experiencing secondary growth compared to trees?
- A. They don't undergo secondary growth.
- B. They exhibit similar patterns.
- C. It happens at a different scale.
- D. Shrubs and vines undergo tertiary growth.
Answer: C
Explanation: Shrubs and vines undergo secondary growth, but on a different scale compared to towering trees.
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