10B Quiz #2

A corn plant produces both male and female flowers. The male flower forms the tassel and the female flower forms the ear of corn. The silks that emerge from the ear are the stigma of the female flower. Each silk leads to an ovule that can become a corn seed.

Which of these must happen for corn seeds to develop on the ear?

• More tassels than silks need to be present on the same plant

• Pollen grains must fall from tassels and land on the silks of the ear

• Pollen must be transported from the tassel to the silk through the phloem.

• The tassels must come into direct contact with the silks of the ear.

Invasive plant species affect the interactions of living and nonliving components of an ecosystem, so the removal of invasive plants is often necessary. The goal of most plant-control methods is to disrupt or inhibit the function of different plant systems. For example, insects can be used to chew through roots in order to reduce a plant’s ability to absorb water.

Which of these functions would be most immediately affected by a reduction in water uptake by roots?

• Disease resistance

• Seed dispersal

• Sunlight absorption

• Photosynthesis

A student reads this advertisement for a product containing a plant micronutrient that can be added to soil.

Based on this information, the student can conclude that boron is absorbed by plant roots from soil and then —

• transported to reproductive tissues by the plant’s shoot system

• stored in plant stems until the flowers are pollinated

• concentrated in the roots until the plant’s reproductive tissues mature

• transported by the phloem to the stomata in leaves, where it attracts pollinators

A student conducted an investigation to study phototropism in grasses. The only difference between the control group and the experimental group was light conditions. The control group was provided full light, while the experimental group was shaded on one side. The diagrams show the average heights and positions of blades of grass in the investigation.

Which statement best explains why the grass tips of the experimental group bent toward the light?

• Water evaporated faster on the side of the plant having full light.

• Light sensors in the grass tips stimulated a hormone in the shoot system.

• The xylem in the root system absorbed more nutrients from the shaded side.

• The side facing the light has a greater chance of absorbing carbon dioxide from the atmosphere.

The part of the plant

that is generally above the ground including stems, leaves, buds and reproductive structures

• Stem System

• Leaf system

• Shoot system

• Xylem

Tags

NGSS.HS-LS2-5

The tubes and support that transport water

and nutrients up, down and around in plants

• Vascular System

• Shoot System

• Root System

• Reproductive System

Tags

NGSS.MS-LS2-3

Vascular tissue (tubes) responsible for the transportation of glucose down and around in a plant.

• Transpiration

• Xylem

• Phloem

• Root Hairs

Tags

NGSS.MS-LS2-3

The process of water movement in plants

due to evaporation out the stomata

and absorption of water through the root hairs

• Active Transport

• Transpiration

• Stomata

• Guard Cells

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

The plant hormone response to the

force of gravity

• Phototropism

• Geotropism

• Thigmotropism

• Transpiration

Tags

NGSS.MS-LS1-5

The plant hormone response to touch

• Thigmotropism

• Geotropism

• Phototropism

• Transpiration