Plant Warm ups

Some mesquite trees have deeper roots than any other plant in the desert. How are deep roots an adaptation for survival in the desert?

• deep roots can protect the tree from predators

• roots encounter cooler conditions far below the desert surface

• roots can extend great distances to reach water

• deep roots interact with beneficial bacteria below the surface

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NGSS.MS-LS1-5

NGSS.MS-LS2-1

Cacti grow slowly compared to most other plants. The fact that cacti keep their stomata closed for much of the day can help explain this growth characteristic. Which of these best explains the advantage of keeping stomata closed during the day?

• It limits water loss through transpiration

• It conserves oxygen produced in photosynthesis

• It recycles carbon dioxide within the plant systems

• It protects the plant tissues from predators

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NGSS.MS-LS1-5

What is the ultimate purpose of xylem and phloem in a plant?

• To get nutrients from the roots to the flower

• To transport water and food such as sugar to certain parts of the plant

• To absorb pollen from the stigma and style

• To transport carbon dioxide and oxygen throughout the plant

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NGSS.MS-LS2-3

Plant hormones serve as chemical messengers between cells and tissues. Auxin is a plant hormone that causes the cells on the shady side of a plant shoot to elongate (get bigger). The response enabled by auxin is known as —

• geotropism

• transpiration

• phototropism

• photosynthesis

Changes in water pressure within guard cells cause the cells to open or close the stomata. This response helps the plant maintain homeostasis by —

• stabilizing the plant’s temperature through the evaporation of water

• regulating the amount of water the plant loses during transpiration

• allowing oxygen needed for photosynthesis to enter the plant

• enabling the plant to release carbon dioxide at night for photosynthesis

Which of these characteristics might help a plant species survive in an area with limited sunlight?

• Bright flowers

• Large leaves

• Short stems

• Thick cuticles

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NGSS.MS-LS1-5

NGSS.MS-LS4-4

What takes place when water evaporates from inside the leaf and water is pulled up the plant?

• tropism

• transpiration

• pollination

• photosynthesis

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NGSS.MS-LS2-1

NGSS.MS-LS2-3

What structure increases a root's surface area allowing it to take in more water?

• stomata

• root hairs

• xylem

• sepal

Water, sugar, and other important nutrients need to be transported from one part of a plant to another. Which statement correctly describes the interaction of the root and shoot systems during nutrient transport?

• The leaves take in water and sugar, which are then transported to the rest of the plant through vascular tissues.

• The roots take in water and sugar, which are then transported to the rest of the plant through vascular tissues.

• The leaves take in water and the roots produce sugar that are transported to the rest of the plant through vascular tissues.

• The roots take in water and produce sugar that are transported to the rest of the plant through vascular tissues.

Tags

NGSS.MS-LS2-3

Gibberellins are hormones produced in the root tips of plants. The plant uses these hormones to stimulate the growth of shoots. How are gibberellins able to affect other parts of the plant?

• Gibberellins are absorbed through the stomata and attach to chloroplasts.

• Gibberellins are transported through vascular tissues to other parts of the plant.

• Gibberellins become concentrated within the tissues of the plant during mitosis.

• Gibberellins become modified once they infect healthy cells and are later released to infect other cells.