Exam 28: The Life of a Flowering Plant

Water lily shoots and roots have very little structural support. This support is not needed in aquatic habitats. What structures would you be LEAST likely to see in a water lily stem?

What is the waxy coating secreted on leaves and most stems?

What is the major component of most plant cell walls?

________ is the delivery of pollen to the stigma.

What is the likely effect of pruning a plant at the dotted line?

Which cells form tubes and are alive when mature?

The ________ is the selective barrier of a root that determines which substances pass between the cortex and vascular tissue.

Scenario A renewable alternative to fossil fuels are biofuels. Scientists are searching for the best plants to use as a source of biofuels. Plant sugars can be fermented into ethanol, and then used as an additive to gasoline. Although it is relatively easy to obtain ethanol in this way, this type of ethanol production competes with the need to produce food. Alternatively, biofuels can be fermented from other plant carbohydrates, such as the cellulose in plant cell walls. This is called cellulosic ethanol production. -Energy input is required to process plant matter in a way that prepares plant cells for cellulosic ethanol production. Lignin needs to be removed to make cellulose accessible. What plant tissue would require the MOST energy input during this preparation step?

Scenario A renewable alternative to fossil fuels are biofuels. Scientists are searching for the best plants to use as a source of biofuels. Plant sugars can be fermented into ethanol, and then used as an additive to gasoline. Although it is relatively easy to obtain ethanol in this way, this type of ethanol production competes with the need to produce food. Alternatively, biofuels can be fermented from other plant carbohydrates, such as the cellulose in plant cell walls. This is called cellulosic ethanol production. -Cellulases are enzymes that are used to break down cellulose. Per unit of mass, which type of cell requires the LEAST amount of cellulase to decompose cell walls?

What type of plant growth can be observed with these cross-sections?

What type of meristem produces the annual growth rings?

What initiates seed germination?

What product(s)used by humans sometimes comes from plants?

What contains the developing egg and cells that support it?

Describe the pattern of growth for the trees in the image.

The condition in which a plant's terminal bud of produces hormones that inhibit growth of axillary buds is ________.

Read the following scenario to answer the questions. The pineapple, grown for its sweet fruit, is a tropical monocot with a diploid number of 50. It can live for many years. The plant starts as one short stem with tough leaves. The flowers of the pineapple are located as a cluster at the very top of the stem. After pollination, the single fruit forms from the fusion of the ovaries of the flowers in the cluster. The seeds are located just underneath the surface of the fruit. The pineapple fruit is harvested by cutting at the base of the fruit. After the first fruit is produced, side shoots grow from the main stem, which can go on to produce additional fruits. -What evidence best supports the pineapple's classification as a monocot, and not a eudicot?

Scenario The North American beaver is a large rodent that builds dams to convert freshwater streams into ponds. Beavers build their dams out of trees, which they cut down using their front teeth. Beavers also eat the leaves and bark of trees, as well as the starchy roots of water lilies. -Water lilies store carbohydrates in their roots, which is why beavers like to eat water lily roots. What type of plant cells store these carbohydrates?

In which structure do pollen grains develop?

Use this figure to answer the questions. -Examine the figure. What process has to occur to produce a haploid embryo sac?