BROOKS BIODIVERSITY UNIT 3 ACTUAL
EXAM PAPER 2026 COMPLETE QUESTIONS
AND CORRECT ANSWERS GRADED A+
●● Plant/Animal Hierarchy.
Answer: Cells --> Tissues --> Organs
●● 3 Plant Tissues.
Answer: 1. Dermal ("Skin")
2. Vascular ("Veins")
3. Ground Tissue ("support tissue")
●● Leaves.
Answer: Responsible for collection and conservation of solar energy
Main photosynthetic organ of most vascular plant
●● Stems.
Answer: Positioning and support of leaves
Trunks of trees are actually modified stems
●● Roots.
,Answer: Anchorage and absorption
Very important for gas exchange
Roots must anchor quickly and take up water
●● Are all stomata on the lower surface of the leaf?.
Answer: No! Only most
On exam
●● Vascular Tissue.
Answer: Xylem and Phloem
Responsible for transport
●● Leaf Structure.
Answer: 1. Epidermis
2. Mesophyll
3. Vein (Vascular Bundle/Vascular Tissue)
●● Epidermis of Leaf (2 Parts).
Answer: Dermal Tissue
Composed of:
1. Cuticle
2. Guard Cells with Stomata
,●● Cuticle.
Answer: Non-living structure made of wax
Produced by the Epidermis to resist desiccation (drying out)
●● Stomata.
Answer: Contain tiny pores called stoma and guard cells
Most are located on the surface of the plant, but there are some on the
upper surface
Purpose is to regulate gas exchange
●● Guard Cells.
Answer: Control the opening and closing of stomata
Purpose is to regulate gas exchange
●● Mesophyll.
Answer: Middle part of the leaf that is the photosynthetic layer (dermal
tissue)
Composed of parenchyma
●● Parenchyma.
Answer: Cells that make up the mesophyll and cells in plants
, Generalized cell type in plants, which 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
●● Parenchyma in Leaves (monocots and Dicots).
Answer: Monocots have 1 layer
Dicots have two layers: Palisade and Spongy
Forms Mesophyll of leaves
●● Parenchyma in Stems.
Answer: Forms the cortex and pith of stems
●● Parenchyma in Roots.
Answer: Forms the cortex
●● Parenchyma in Fruits.
Answer: Forms the pulp of fruits
●● Parenchyma in Seeds.
Answer: Forms the endosperm of seeds
EXAM PAPER 2026 COMPLETE QUESTIONS
AND CORRECT ANSWERS GRADED A+
●● Plant/Animal Hierarchy.
Answer: Cells --> Tissues --> Organs
●● 3 Plant Tissues.
Answer: 1. Dermal ("Skin")
2. Vascular ("Veins")
3. Ground Tissue ("support tissue")
●● Leaves.
Answer: Responsible for collection and conservation of solar energy
Main photosynthetic organ of most vascular plant
●● Stems.
Answer: Positioning and support of leaves
Trunks of trees are actually modified stems
●● Roots.
,Answer: Anchorage and absorption
Very important for gas exchange
Roots must anchor quickly and take up water
●● Are all stomata on the lower surface of the leaf?.
Answer: No! Only most
On exam
●● Vascular Tissue.
Answer: Xylem and Phloem
Responsible for transport
●● Leaf Structure.
Answer: 1. Epidermis
2. Mesophyll
3. Vein (Vascular Bundle/Vascular Tissue)
●● Epidermis of Leaf (2 Parts).
Answer: Dermal Tissue
Composed of:
1. Cuticle
2. Guard Cells with Stomata
,●● Cuticle.
Answer: Non-living structure made of wax
Produced by the Epidermis to resist desiccation (drying out)
●● Stomata.
Answer: Contain tiny pores called stoma and guard cells
Most are located on the surface of the plant, but there are some on the
upper surface
Purpose is to regulate gas exchange
●● Guard Cells.
Answer: Control the opening and closing of stomata
Purpose is to regulate gas exchange
●● Mesophyll.
Answer: Middle part of the leaf that is the photosynthetic layer (dermal
tissue)
Composed of parenchyma
●● Parenchyma.
Answer: Cells that make up the mesophyll and cells in plants
, Generalized cell type in plants, which 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
●● Parenchyma in Leaves (monocots and Dicots).
Answer: Monocots have 1 layer
Dicots have two layers: Palisade and Spongy
Forms Mesophyll of leaves
●● Parenchyma in Stems.
Answer: Forms the cortex and pith of stems
●● Parenchyma in Roots.
Answer: Forms the cortex
●● Parenchyma in Fruits.
Answer: Forms the pulp of fruits
●● Parenchyma in Seeds.
Answer: Forms the endosperm of seeds
