Which structure labeled on this diagram regulates the rate at which photosynthesis occurs?

• cuticle

• xylem

• vacuole

• guard cell

Tags

NGSS.MS-LS1-6

The celery stalk shown here was placed in a cup of water with red food dye. Why did the leaves turn red and the base of the stalk appear to have red dots?

• roots absorb water and minerals which is moved up to the leaves by xylem; phloem moves glucose produced in the leaves down to the roots

• xylem in the leaves moved water down to the roots; phloem in the roots moved glucose up to the leaves

• the stem absorbed the water and then vascular tissues moved it around the plant

• the leaves absorbed the water and it was released through the stem

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-3

Transport of sugars down from the leaves to the roots is achieved through the ___.

• xylem

• phloem

• stoma

• cuticle

Some plants secrete toxic substances. Why is this a helpful adaptation?

• It is a defense mechanism to protect against being eaten.

• It is a random genetic mutation that does not serve a purpose.

• This attracts herbivores and makes it more likely that the plant will be eaten.

• There is no benefit or harm to any organism with this adaptation.

Tags

NGSS.MS-LS2-4

NGSS.MS-LS4-4

The image here shows a thigmotropism response present in some plants. Why might this be beneficial to the plant?

• protection from water loss

• improved absorption of sunlight

• protection from herbivorous animals

• improved release of oxygen from stomata

Tags

NGSS.MS-LS4-4

Why are guard cells important?

• absorption of sunlight

• release of excess glucose

• regulating the rate of water loss

• transport of water and minerals

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

Which tissue is responsible for transporting water and minerals up from the roots?

• xylem

• phloem

• stomata

• root hairs

Tags

NGSS.MS-LS2-3

Guard cells would close the stoma when which environmental condition is present?

• limited water in the soil

• excess rainfall

• prolonged periods of sunlight

• prolonged periods of darkness

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Auxin will accumulate in plant cells on the shaded side of a stem, causing them to lengthen in an attempt to make the stem bend and grow towards light. This growth response is known as ___.

• thigmotropism

• gravitropism

• phototropism

• photoperiodism

Just like animals, plants have hormones that control their growth and response to the environment. Examples of these plant hormones include auxin, ethylene, and cytokinin. These hormones are transported in the plant by which tissues?

• vascular tissues

• epithelial tissues

• stomata

• root hairs