Brooks Biodiversity
Brooks Biodiversity Unit 3 Complete Exam Study Guide (2025/2026)
– 150+ Verified Questions with Correct Answers & Detailed
Rationales | Comprehensive Biology Review
ASCORERS STUVIA
This Document Contains:
Brooks Biodiversity Unit 3 Exam
2025/26 150+ Questions, Correct Answers & Ratinales
100% Guaranteed Pass
Complete A+ Guide
, Brooks Biodiversity Unit 3 Complete Exam Study Guide
(2025/2026) – 150+ Verified Questions with Correct Answers &
Detailed Rationales | Comprehensive Biology Review
Which of the following plant organs is primarily responsible for collecting and
converting solar energy into chemical energy?
A. Roots
B. Stems
C. Leaves
D. Flowers
Answer: C. Leaves
Explanation: Leaves serve as the primary photosynthetic organs in plants, capturing solar
energy through chlorophyll pigments and converting it to chemical energy during
photosynthesis. Roots anchor the plant and absorb nutrients, stems provide support and
transport, and flowers are reproductive structures, not energy converters.
Which structure provides positioning and support for leaves, ensuring optimal light
capture?
A. Stem
B. Root
C. Petiole
D. Vein
Answer: A. Stem
,Explanation: The stem elevates leaves toward sunlight, optimizing exposure for
photosynthesis while also serving as a conduit for water and nutrient transport. Petioles
attach individual leaves but do not provide overall support; roots anchor the plant, and veins
are internal transport structures.
Which part of the plant anchors it to the soil and facilitates absorption of water and
minerals?
A. Stem
B. Root
C. Leaf
D. Flower
Answer: B. Root
Explanation: Roots are specialized for anchorage and absorption, drawing water and
essential minerals from the soil into the vascular system. Stems focus on transport and
support, leaves perform photosynthesis, and flowers aid in reproduction rather than
absorption.
What tissue system is responsible for transporting water, nutrients, and sugars
throughout a plant?
A. Dermal
B. Ground
C. Vascular
D. Meristematic
Answer: C. Vascular
Explanation: The vascular system, composed of xylem and phloem, is responsible for long-
distance transport—xylem moves water and minerals upward, while phloem distributes
, sugars. Dermal tissue protects, ground tissue stores and supports, and meristematic tissue
drives growth.
Which combination correctly describes the main parts of a leaf?
A. Epidermis, Cortex, Xylem
B. Epidermis, Mesophyll, Vein
C. Cuticle, Pith, Cambium
D. Cortex, Endodermis, Stoma
Answer: B. Epidermis, Mesophyll, Vein
Explanation: A leaf’s structure includes the epidermis (protective outer layer), mesophyll
(photosynthetic tissue), and veins (vascular bundles for transport). The other options mix
stem and root structures not found in leaves.
What is the primary function of the cuticle in plant leaves?
A. Facilitate gas exchange
B. Prevent water loss
C. Conduct photosynthesis
D. Absorb nutrients
Answer: B. Prevent water loss
Explanation: The cuticle is a waxy, waterproof layer produced by the epidermis that
minimizes desiccation by reducing transpiration. It does not perform photosynthesis or gas
exchange; those occur in the mesophyll and stomata, respectively.
Guard cells are primarily responsible for:
A. Photosynthesis in leaves
Brooks Biodiversity Unit 3 Complete Exam Study Guide (2025/2026)
– 150+ Verified Questions with Correct Answers & Detailed
Rationales | Comprehensive Biology Review
ASCORERS STUVIA
This Document Contains:
Brooks Biodiversity Unit 3 Exam
2025/26 150+ Questions, Correct Answers & Ratinales
100% Guaranteed Pass
Complete A+ Guide
, Brooks Biodiversity Unit 3 Complete Exam Study Guide
(2025/2026) – 150+ Verified Questions with Correct Answers &
Detailed Rationales | Comprehensive Biology Review
Which of the following plant organs is primarily responsible for collecting and
converting solar energy into chemical energy?
A. Roots
B. Stems
C. Leaves
D. Flowers
Answer: C. Leaves
Explanation: Leaves serve as the primary photosynthetic organs in plants, capturing solar
energy through chlorophyll pigments and converting it to chemical energy during
photosynthesis. Roots anchor the plant and absorb nutrients, stems provide support and
transport, and flowers are reproductive structures, not energy converters.
Which structure provides positioning and support for leaves, ensuring optimal light
capture?
A. Stem
B. Root
C. Petiole
D. Vein
Answer: A. Stem
,Explanation: The stem elevates leaves toward sunlight, optimizing exposure for
photosynthesis while also serving as a conduit for water and nutrient transport. Petioles
attach individual leaves but do not provide overall support; roots anchor the plant, and veins
are internal transport structures.
Which part of the plant anchors it to the soil and facilitates absorption of water and
minerals?
A. Stem
B. Root
C. Leaf
D. Flower
Answer: B. Root
Explanation: Roots are specialized for anchorage and absorption, drawing water and
essential minerals from the soil into the vascular system. Stems focus on transport and
support, leaves perform photosynthesis, and flowers aid in reproduction rather than
absorption.
What tissue system is responsible for transporting water, nutrients, and sugars
throughout a plant?
A. Dermal
B. Ground
C. Vascular
D. Meristematic
Answer: C. Vascular
Explanation: The vascular system, composed of xylem and phloem, is responsible for long-
distance transport—xylem moves water and minerals upward, while phloem distributes
, sugars. Dermal tissue protects, ground tissue stores and supports, and meristematic tissue
drives growth.
Which combination correctly describes the main parts of a leaf?
A. Epidermis, Cortex, Xylem
B. Epidermis, Mesophyll, Vein
C. Cuticle, Pith, Cambium
D. Cortex, Endodermis, Stoma
Answer: B. Epidermis, Mesophyll, Vein
Explanation: A leaf’s structure includes the epidermis (protective outer layer), mesophyll
(photosynthetic tissue), and veins (vascular bundles for transport). The other options mix
stem and root structures not found in leaves.
What is the primary function of the cuticle in plant leaves?
A. Facilitate gas exchange
B. Prevent water loss
C. Conduct photosynthesis
D. Absorb nutrients
Answer: B. Prevent water loss
Explanation: The cuticle is a waxy, waterproof layer produced by the epidermis that
minimizes desiccation by reducing transpiration. It does not perform photosynthesis or gas
exchange; those occur in the mesophyll and stomata, respectively.
Guard cells are primarily responsible for:
A. Photosynthesis in leaves
