Chapter 18: Growth and Reproduction in Plants

Clicker Questionsby Kris Curran, University of Wisconsin-Whitewater

Which answer below is a true statement with regard to asexual and sexual reproduction?1. Asexual reproduction requires gametes

while sexual reproduction does not.2. Asexual reproduction leads to greater

genetic variation within a population, while sexual reproduction does not.

3. Asexual reproduction is more energy efficient, while sexual reproduction is not.

4. Asexual reproduction is a useful means of reproduction in a changing environment, while sexual reproduction is not.

Classroom Catalyst

Genetic Diversity in Agriculture (or Lack

Thereof)

Should we continue using existing agricultural practices, using a small number of species with little genetic diversity?

1. Strongly agree2. Agree3. Neutral4. Disagree5. Strongly

disagree

In both flowering and nonflowering plants, there is a cycle between multicellular haploid and diploid forms called:

1. plant life cycle.2. alternation of generations.3. sexual reproduction.4. asexual reproduction.5. embryonic development.

In which structure would you expect to find the egg (ovule) of a plant?

1. Anther2. Filament3. Stigma4. Style5. Ovary

How many nuclei are present in a pollen grain released by a plant?

1. 12. 23. 34. 4

All of the cells inside the embryo sac of a female flower are haploid.1. True2. False

One genus of orchid has a petal that is shaped like a female wasp. Male wasps try to copulate with the “female” and in the process get coated with pollen. This pollination strategy is called _________ and is the result of ____________.

1. bribery; coevolution2. trickery; coevolution3. bribery; random chance4. trickery; random chance

What two structures are formed during double fertilization?

1. Zygote and pollen tube2. Endosperm and pollen tube3. Zygote and egg4. Zygote and endosperm

Which structure below contains three copies of the plant genome?1. Pollen 2. Sperm cell3. Ovule4. Endosperm5. Zygote

Which answer below is an example of preventing self fertilization by separating the male and female flowers?

1. A single pine tree has both male and female pine cones.

2. A common weed, Silene alba, has individual plants that are either male or female.

3. In magnolia blossoms the pistil develops before the stamen.

4. None of the above.

Let’s think about a peanut. The outer shell was formed from the ____________. Next, there is a very thin covering around the peanut that was formed from the ovule (seed coat). The next layer is the part we eat that surrounds the embryo, which would have been formed from the ________.

1. endosperm; ovary2. ovary; ovule3. meristems; ovary4. ovary; endosperm5. meristems; endosperm

Which answer below is an example of the use of water by a plant to disperse of seeds?

1. Ragwort seeds are light and have long thin hairs.

2. Burdock seeds are surrounded by many long, hook-like extensions.

3. The Pond Iris seed pods break open and release seeds that can float.

4. Blackberries are eaten by birds, mice, and deer.

What processes might elicit the germination of a seed?

1. Fire2. Digestion by an animal3. Optimal humidity and

sunlight4. All of the above

Cells of apical and lateral meristems act like ________ in animals.

1. skin cells2. hair follicles3. embryonic stem cells4. photoreceptor cells5. sperm cells

Which answer is an example of growth in a tree due to vascular cambium?

1. A bud forms on a branch.2. The tip of a root

elongates.3. A leaf forms on a branch.4. A branch forms on a trunk.5. A branch gets thicker.