Exam 23: Plant Physiology

Flowers, like the ones in this figure, display spectacular colors, shapes, and odors, in combination with food rewards such as nectar, to convince pollinating animals to visit several flowers of the same species and transfer pollen for reproduction. How might a flower be specialized to attract hummingbird pollinators (right) and discourage insect pollinators (left)?

Worldwide, more than 80 percent of the calories consumed by humans come from

Like other organisms, plants are composed of proteins, lipids, carbohydrates, and nucleic acids. Based on this information, which of the following would be a macronutrient?

How might a flower be specialized to attract bat pollinators and discourage insect pollinators?

The plant hormone auxin causes cells in the shoot to elongate (grow longer). Auxin is involved in the phototropic response because it moves from one side of the plant to the other in response to light. Discuss the direction in which auxin moves (toward light or away from light) and how this helps the phototropic response.

Plants generally require having approximately the same size root system as the size of the shoot system. The hormones auxin and cytokinin work together to balance the root-to-shoot ratio in plants. Identify where each of these hormones is produced (in the root or in the shoot) and how they function to maintain this balance.

The flower is an organ that is found on the ________ of a flowering plant.

A botanist is asked to identify which plant organ is the source of an unknown sample. A cross section shows that the vascular tissue is found in the center of the structure, with the ground tissue outside of the vascular cylinder. Which plant organ is the source of this sample?

What are the advantages and disadvantages of animal pollination versus wind pollination?

A typical fertilizer contains no carbon, because carbon is

A tiny insect known as an aphid obtains nutrition by poking a mouthpart into the stem of a plant. Once the aphid's mouthpart is inserted, fluid from the plant is pushed through the digestive tract of the aphid by pressure. The aphid's mouthpart has most likely penetrated the plant's

Spores undergo mitosis to form the haploid ________, one of the two stages in the life cycle of plants.

You notice that one of your bean plants has a stem that does not grow in the same direction as all the other bean plants. This plant stem branches often and grows in random directions. This plant most likely lacks which of the following hormones?

Match each plant structure to the function that the structure performs. -dermal tissue

In plants, the diploid stage of the life cycle produces ________ by ________.

After plant gametes fuse, they undergo mitosis to produce the

One of your plants produces more roots and fewer shoots than a healthy plant. This plant most likely has

Plants are protected from herbivores by ________ tissue, which also controls gas exchange.

Which of the following is NOT a plant hormone?

Because its cells are diploid, the ovule is a part of the