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Biodiversity Unit 3 Exam (Latest 2026 Update) 100%
Verified Questions & Answers | Grade A
Biology: Biodiversity Unit 3 Examination | Core Topics: Evolutionary Relationships, Classification Systems,
Phylogenetics, Species Interactions, Ecosystem Diversity, Adaptive Traits, Natural Selection, Genetic Variation,
Conservation Biology, and Human Impact on Biodiversity | Verified Questions & Correct Answers | High-Quality
Grade A Study Guide
Exam Structure
The Biodiversity Unit 3 Exam (2026 Update) assesses student understanding of biological diversity, evolutionary
processes, ecosystem-level variation, and species classification. This study guide presents fully verified exam questions
arranged by subtopics, ensuring comprehensive coverage of Unit 3 concepts and strong preparation for course
assessments.
Introduction
This Biodiversity Unit 3 Exam guide provides thoroughly checked and 100% verified correct answers supported by
clear explanations. Designed to reinforce understanding of evolutionary patterns, ecological interactions, and
classification principles, this resource helps students strengthen scientific reasoning and content mastery. It supports
high-level performance on Unit 3 assessments and builds a strong foundation for continued biology coursework.
Answer Format
All correct answers appear in yellow, followed by concise scientific explanations that reinforce key concepts, clarify
relationships, and distinguish the correct option from distractors. Rationales improve understanding and support
confident exam preparation.
1/21
,TEST Q: Is pseudocoelom a true body cavity? Yes
TEST Q: Do plants rely on abiotic or biotic fixation? Biotic
TEST Q: Is the way to a clams heart through its Yes
anus?
TEST Q: Which of the follow can sea anemones not They cannot roller blade. They can swim, somersault
do? (ik), and crawl
What do the leaves do in plants? Conduct photosynthesis and gas exchange
What do the stems do in plants? They help with positioning and support of the leaves
What do the roots do in plants? Anchor the plant and absorb water and nutrients
What does the vascular system do in a plant? It transports materials throughout the plant
Epidermis Outer layer of the leaf (both top and bottom)
Cuticle A waxy covering only on the top of a leaf
What does the cuticle help with? Prevents water loss and helps with gas exchange
What is the cuticle made of? Chitin
Stomata Small opening on the underside of a plant that
regulates gas exchange
Guard cells Cells that prevent gases and water from getting into the
stomata when it is closed
Mesophyll The cells that reside in the middle of the leaf in
between the epidermis.
2/21
, What are the two types of mesophyll? Palisade (Parenchyma) and spongy
Is palisade mesophyll above or below spongy Above because it is more involved with photosynthesis so it needs
mesophyll? to be closer to the top.
Is spongy mesophyll above or below palisade Below because it is more involved in reactions that don't involve
mesophyll? light.
Vascular bundle (vein) The veins of a leaf that contain vascular tissue (xylem and phloem)
and transport water and nutrients throughout the plant.
What is the stem made up of? Collenchyma, sclerenchyma (fibers & sclerids), vascular tissue,
procambium
Cortex & pith An outer layer of tissue immediately below the epidermis of a stem
or root in a dicot
Ground parenchyma Found in monocots
Xylem Transports water from the roots to the leaves (entire plant) .
What are the two xylem tissue? Tracheids & vessel members
Tracheids Thin tube-shaped xylem cell that is more restrictive of water flow
Vessel elements Large tube-shaped xylem cell with no partitions that allow greater
water flow
Phloem Vascular tissue that transports sugars throughout the plant
What are the two types of phloem tissue? Sieve tube members & companion cells
Sieve tube members Tube-shaped cells that are the main transporters of sugar. They
cannot maintain metabolic requirements without assistance from
companion cells
Companion cells Vascular tissue that assists the sieve tube members metabolically.
They keep other cell types alive.
3/21
Biodiversity Unit 3 Exam (Latest 2026 Update) 100%
Verified Questions & Answers | Grade A
Biology: Biodiversity Unit 3 Examination | Core Topics: Evolutionary Relationships, Classification Systems,
Phylogenetics, Species Interactions, Ecosystem Diversity, Adaptive Traits, Natural Selection, Genetic Variation,
Conservation Biology, and Human Impact on Biodiversity | Verified Questions & Correct Answers | High-Quality
Grade A Study Guide
Exam Structure
The Biodiversity Unit 3 Exam (2026 Update) assesses student understanding of biological diversity, evolutionary
processes, ecosystem-level variation, and species classification. This study guide presents fully verified exam questions
arranged by subtopics, ensuring comprehensive coverage of Unit 3 concepts and strong preparation for course
assessments.
Introduction
This Biodiversity Unit 3 Exam guide provides thoroughly checked and 100% verified correct answers supported by
clear explanations. Designed to reinforce understanding of evolutionary patterns, ecological interactions, and
classification principles, this resource helps students strengthen scientific reasoning and content mastery. It supports
high-level performance on Unit 3 assessments and builds a strong foundation for continued biology coursework.
Answer Format
All correct answers appear in yellow, followed by concise scientific explanations that reinforce key concepts, clarify
relationships, and distinguish the correct option from distractors. Rationales improve understanding and support
confident exam preparation.
1/21
,TEST Q: Is pseudocoelom a true body cavity? Yes
TEST Q: Do plants rely on abiotic or biotic fixation? Biotic
TEST Q: Is the way to a clams heart through its Yes
anus?
TEST Q: Which of the follow can sea anemones not They cannot roller blade. They can swim, somersault
do? (ik), and crawl
What do the leaves do in plants? Conduct photosynthesis and gas exchange
What do the stems do in plants? They help with positioning and support of the leaves
What do the roots do in plants? Anchor the plant and absorb water and nutrients
What does the vascular system do in a plant? It transports materials throughout the plant
Epidermis Outer layer of the leaf (both top and bottom)
Cuticle A waxy covering only on the top of a leaf
What does the cuticle help with? Prevents water loss and helps with gas exchange
What is the cuticle made of? Chitin
Stomata Small opening on the underside of a plant that
regulates gas exchange
Guard cells Cells that prevent gases and water from getting into the
stomata when it is closed
Mesophyll The cells that reside in the middle of the leaf in
between the epidermis.
2/21
, What are the two types of mesophyll? Palisade (Parenchyma) and spongy
Is palisade mesophyll above or below spongy Above because it is more involved with photosynthesis so it needs
mesophyll? to be closer to the top.
Is spongy mesophyll above or below palisade Below because it is more involved in reactions that don't involve
mesophyll? light.
Vascular bundle (vein) The veins of a leaf that contain vascular tissue (xylem and phloem)
and transport water and nutrients throughout the plant.
What is the stem made up of? Collenchyma, sclerenchyma (fibers & sclerids), vascular tissue,
procambium
Cortex & pith An outer layer of tissue immediately below the epidermis of a stem
or root in a dicot
Ground parenchyma Found in monocots
Xylem Transports water from the roots to the leaves (entire plant) .
What are the two xylem tissue? Tracheids & vessel members
Tracheids Thin tube-shaped xylem cell that is more restrictive of water flow
Vessel elements Large tube-shaped xylem cell with no partitions that allow greater
water flow
Phloem Vascular tissue that transports sugars throughout the plant
What are the two types of phloem tissue? Sieve tube members & companion cells
Sieve tube members Tube-shaped cells that are the main transporters of sugar. They
cannot maintain metabolic requirements without assistance from
companion cells
Companion cells Vascular tissue that assists the sieve tube members metabolically.
They keep other cell types alive.
3/21
