24.1 Reproduction in Flowering Plants

Understand Key Concepts

1. In angiosperms, the structures that produce the male gametophyte are called the

   1. anthers.

   2. sepals.

   3. pollen tubes.

   4. stigmas.

2. Pollination occurs when pollen lands on

   1. the style.

   2. the stigma.

   3. the filament.

   4. the anther.

3. The process in which a single plant produces many offspring genetically identical to itself is

   1. sexual reproduction.

   2. agriculture.

   3. dormancy.

   4. vegetative reproduction.

4. What is a carpel? Where is it located in a typical flower?

5. Describe at least two ways in which pollen is transferred from one plant to another.

6. What are the products of double fertilization? Describe them.

Think Critically

7. Interpret Visuals The diagram below shows the parts of a typical flower.

   

   1. Inside which structure is pollen produced?

   2. What structure is represented by A? What is its function?

   3. In which structure do seeds develop?

   4. What is the name of structure G?

24.2 Fruits and Seeds

Understand Key Concepts

8. The thickened ovary wall of a plant may join with other parts of the flower to become the

   1. fruit.

   2. seed.

   3. endosperm.

   4. cotyledon.

9. The period during which the embryo is alive but not growing is called

   1. fertilization.

   2. vegetative growth.

   3. dormancy.

   4. germination.

10. Give examples of seed dispersal by animal, wind, and water.

11. What is the function of dormancy?

Think Critically

12. Predict Some plants form flowers that produce stamens but no carpels. Could fruit form on one of these flowers? Explain your answer.

13. Infer The seeds of lupines, an arctic plant, can remain dormant for thousands of years. Why might this trait be important to a plant in an arctic environment?

14. Design an Experiment A friend suggests that seeds do not need cotyledons to grow. You argue that cotyledons are important to seeds. Design a controlled experiment that shows the effect on seed growth of removing cotyledons.

24.3 Plant Hormones

Understand Key Concepts

15. Chemical signals in plants affecting the growth, activity, and development of cells and tissues are called

    1. hormones.

    2. enzymes.

    3. auxins.

    4. phytochromes.

16. Substances that stimulate cell division and cause dormant seeds to sprout are

    1. gibberellins.

    2. auxins.

    3. cytokinins.

    4. phytochromes.

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