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Brooks Biodiversity Unit 3 Exam questions and answers 2025(graded A+).
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Brooks Biodiversity Unit 3 Exam questions and answers 2025(graded A+).
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Brooks Biodiversity Unit 3Exam questions and answers
2025(graded A+)
Plants Architecture - answer Plant needs
i. collection & conversion of solar energy -> leaves
ii. positioning & support of leaves -> stems
iii. anchorage & absorption -> roots
iv. transport -> vascular system
Leaf Structure - answer Epidermis, Mesophyll, and Vein (Vascular Bundle)
Epidermis contains what? - answer - Cuticle
- Guard cells with Stomata
Epidermis - answer outermost cell layer of a plant body
cutin: (wax) excreted by epidermis
Cuticle - answer Waxy waterproof covering of a plant.
Produced by the epidermis and has wax to resist desiccation.
Guard Cells - answer Responsible for opening and closing stomata.
Works together with stomata to regulate gas exchange.
Prevents movement of water ACROSS surface
Stomata - answer Small openings on the underside of a leaf through which
oxygen and carbon dioxide can move.
Mostly on lower surfaces, sometimes on upper surfaces. Found on both
surfaces.
Allows for gas exchange.
,2 aspects of Photosynthesis - answer light dependent reactions
light independent reactions
Mesophyll contains what? - answer - Parenchyma
- Dicots have Palisade & Spongy Layers
Mesophyll - answer Middle leaf structures photosynthetic layer.
Parenchyma - answer Ground tissue that forms the bulk of the mesophyll
Can be modified into collenchyma and sclerenchyma
Thin and flexible cells
Most common and versatile ground tissue
Used for metabolic functions and storage of organic products
Palisade & Spongy layers - answer Palisade layer: where light dependent
reactions occur, near the surface. Top part of the mesophyll in dicot
plants.
Spongy mesophyll or spongy parenchyma: soft lower layer. Has access to
CO2 through stomata. Kelvin Cycle: where carbon fixation occurs,
converting nonorganic CO2 into sugars.
Vein (Vascular bundle) - answer Transports materials throughout the leaf
and contains the xylem and phloem.
Separating the VB = damage.
Stem Structure - answer Epidermis, Cortex, Collenchyma, Sclerenchyma,
Vascular Tissues
Xylem - answer (Xylem Up)
Distributes water from roots throughout
, Aimed towards stem
Red
Tells age of tree
Contains: tracheids & vessel members
Tracheids - answer Thin, hollow, narrow tube, dead cells with perforated,
tapered ends.
Vestigial structure
First kind of tube made
Present in early vascular plants and present in angiosperms and
gymnosperms (slow flow)
Vessel Members - answer Thick, hollow, wide tube, dead cells with large
holes on end.
Clearly visible
Phloem - answer (Phloem Down)
Distributes the products of photosynthesis (sugary water) to plants
tissues.
Blue
Contains: Sieve tube members (element) & Companion cells
Sieve Tube Members - answer hollow, living cells with perforated cells
Companion Cells - answer living cells that help keep sieve tube member
cells alive.
Production of sugars in Kelvin Cycle require transportation done by
companion cells into phloem
Which 4 cell types is most active metabolically when fully functional? -
answer companion cells
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