W1 Unit Test 3

How does the structure of xylem and phloem help plants survive in dry habitats?

• Xylem stores sugar for photosynthesis

• Xylem transports water efficiently while phloem distributes food throughout the plant

• Phloem protects roots from drying out

• Phloem absorbs water directly from the soil

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NGSS.MS-LS2-3

Which reproductive strategy provides the greatest advantage for survival in a rapidly changing climate?

• Gymnosperms producing exposed seeds on cones

• Angiosperms using flowers and fruits for seed dispersal

• Gymnosperms relying on wind pollination only

• Both strategies are equally effective regardless of climate

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NGSS.MS-LS1-4

NGSS.MS-LS4-4

A plant species begins flowering earlier due to warmer winters. What type of adaptation is this, and how might it affect local wildlife?

• Physical adaptation; animals will migrate sooner

• Behavioral adaptation; animals may lose food sources at the wrong time

• Physical adaptation; insects will stop pollinating

• Behavioral adaptation; plants will stop reproducing

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NGSS.MS-LS1-4

NGSS.MS-LS1-5

NGSS.MS-LS2-4

Needle-like leaves and thick bark most likely indicate adaptation to:

• Cold, snowy environments with water loss prevention

• Hot deserts with little sunlight

• Shady rainforest floors

• Wetland habitats with high humidity

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NGSS.MS-LS2-1

NGSS.MS-LS4-4

Using a dichotomous key, a plant with five-petaled flowers and opposite leaves would be classified by focusing on:

• Root color and soil type

• Leaf arrangement and flower structure

• Bark texture and seed size

• Height and growth season

Prescribed burns improve biodiversity in a fire-maintained ecosystem because they:

• Destroy all native species and allow invasive ones to dominate

• Remove dead material, recycle nutrients, and create open space for new growth

• Reduce soil fertility to slow plant growth

• Trap moisture and prevent seed germination

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NGSS.MS-LS2-2

NGSS.MS-LS2-4

Which statement best describes the role of pioneer species in primary succession?

• They are the final stage of a stable ecosystem.

• They prepare the environment by adding nutrients and breaking down rock.

• They compete only with mature trees.

• They slow down soil formation.

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NGSS.MS-LS2-3

A wetland is invaded by an aggressive nonnative species. Which management plan would best reduce its impact on native plants?

• Introducing more invasive species to compete

• Removing the invader and replanting with native species

• Flooding the wetland to drown all plants

• Stopping all human activity and letting it spread

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NGSS.MS-LS2-4

NGSS.MS-LS2-5

Pollinator–plant interactions differ most between forests and grasslands because:

• Grasslands have fewer flowering plants

• Forest shade affects pollinator activity and flower availability

• Pollinators avoid grasslands entirely

• Forests have no wind pollination

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NGSS.MS-LS2-2

A plant with high seed production and rapid growth is most likely:

• A slow-growing native species

• An invasive species capable of outcompeting natives

• A climax species adapted to mature forests

• A pioneer species with short lifespans only

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NGSS.MS-LS2-4