Plant Systems

Cytokinins are a class of plant hormones that help regulate growth by promoting cell division. Cytokinins are produced mainly in meristematic tissue, where most plant growth occurs. Which system carries cytokinins produced in the roots to the rest of the plant?

• Vascular system

• Dermal system

• Reproductive system

• None of the above

Plants called sundews have rounded green leaves with many hair-like structures. The ends of these structures contain enzymes in a sticky liquid that looks like nectar or moisture, as shown in the picture. The hairs do not react to dust or nonliving material but will bend inward when insects get caught in the sticky liquid. Sundews digest trapped insects over a period of a few days.

Based on this information, what functions do the specialized leaves of sundews perform?

• Provide water to the plant and perform photosynthesis

• Respond to stimuli and anchor the plant

• Provide nutrients to the plant and respond to stimuli

• Release pollen to insects and perform photosynthesis

Tags

NGSS.MS-LS4-4

Structures represented in the illustration are found in the lower epidermis of a plant leaf. The illustration at right shows the response to a certain environmental condition.

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

Tags

NGSS.HS-LS1-3

NGSS.HS-LS2-6

The internal transport of water and minerals in plants requires that two systems work together. Which diagram correctly describes how the two systems accomplish this?

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Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

The diagram shows the reproductive system of a plant.

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 fertilizes 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