Biology TEK 10B

Leaves are part of a plants shoot system. The xylem tissue transports

• bacteria needed for nitrogen fixaton in root nodules

• the wax required to coat the surface of actively growing tissue

• the water and minerals that are absorbed by the roots

• the oxygen that regulates the rate of carbohydrate production

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Plant hormones serve as chemical messengers between cells and tissue. Auxin is a plant hormone that causes the cells on the shady side of a plant shoot to elongate. The response enabled by auxin is known as -

• geotropism

• transpiration

• phototropism

• photosythesis

Copper is a micronutrient that can be found in soil. Copper is important for reproductive growth in plants and plays an indirect role in chlorophyll production. Which statement correctly describes the interaction that occurs between the root and the shoot systems of plant to allow reproduction to occur?

• Copper is produced in the roots when copper-containing compounds are hydrolyzed.

• Copper that is absorbed by the roots is transported to reproductive tissue by the shoot system.

• The shoot system stores copper for later use by the roots and the reproductive structures.

• The shoot system transports copper to the roots after it is taken in through stomata in the leaves.

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How do the plant systems work together to make this movement of liquid possible?

• The roots absorb water and minerals and move them up to the stem, while the stem moves food produced in the leaves down to the roots in tiny tubes.

• The roots anchor the plants in the soil, and the stem holds the leaves up.

• The roots absorb their own water and minerals, while the stem absorbs its water and minerals through the leaves.

• The roots lose water vapor to the soil, and the stem loses water vapor through the leaves.

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The outermost layer of plant stems in dicotyledons consists of epidermal cells and guard cells that surround opening called stomata. The epidermal cells ate usually covered with a waterproof layer that provides protection for injury and water loss. The stomata allow gas exange. The epidermal cells and stomata have functions similar to those of which two humans body systems?

• Skeletal and respiratory

• cardiovascular and skeletal

• integumentary and respiratory

• cardovascular and integumentary

What process worked most directly with the transport system to heal the wound?

• cellular reproduction

• photosynthesis

• water intake

• carbohydrate storage

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The response represented in the illustration would most likely be caused by-

• a reduced supply of oxygen

• long periods of rainfall

• high concentrations of glucose

• little available water

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Which of the following best describes the interaction that occurs between a plant's reproductive parts during self-fertilization?

• Pollen is released from the anther and is transferred to the stigma. A pollen tube forms and grows through the style. The pollen tube reaches the filament, where the sperm fertilzes the egg.

• Pollen moves from the ovule up through the style and is released from the stigma. The pollen is transferred to the anther, where the sperm fertilizes the egg.

• Pollen is released from the anther and is transferred to the stigma. A pollen tube forms and grows through the style. The pollen tube reaches an ovule within the ovary, where the sperm fertilizes the egg.

• Pollen is released from the stigma and is transferred to the anther. A pollen tube grows down from the anther through the filament and fuses with the ovule, where the sperm fertilizes the egg.

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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.

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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.