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BIOL Exam 5
| Question | Answer |
|---|---|
| Which substance induces "bolting," the rapid elongation of a plant stem? | A gibberellin |
| What do auxin, cytokinins, gibberellins, abscisic acid, and ethylene have in common? | All of the listed hormones achieve their effects by stimulating or inhibiting cell division or cell elongation. |
| __ promote(s) seed germination and __ inhibit(s) seed germination. | Gibberellins; abscisic acid |
| __ is the protein that plants use to sense the photoperiod. | Phytochrome |
| Auxin | Stimulates cell elongation in newly forming tissues. |
| What dense storage granules in plant cells are thought to contribute to gravitropism? | Starch |
| Felicia decides she wants to start growing bonsai trees. In her readings, she learns that removing apical branches to promote "back budding" of laternal buds is the basis of the art. What delicate balance does this practice disrupt? | The balance of auxins and cytokines within the plant body |
| Abscisic acid was once referred to as the "abscission hormone" (hence the name). Why is the term abscisic acid really a misnomer? | Abscisic acid works in concert with auxin to promote leaf fall |
| What term refers to seasonal changes in the relative lengths of night and day. | Photoperiod |
| What helps regenerate the movement of carbon dioxide into and out of a leaf | Guard cells |
| Double fertilization is unique to flowering plants. How does it work? | A pollen grain delivers two sperms. One fertilizes the egg, and the other combines with two haploid nuclei to form the triploid endosperm. |
| In flowering plants, the main visible plant body is the __. | Diploid sporophyte |
| How does plant growth change if the terminal bud is removed or its growth is otherwise hindered? | Growth of axillary buds is stimulated so the plant grows outward instead of just upward. |
| Which of the following are dead at maturity? | Tracheids and vessel elements |
| What part of a flowering plant develops to form the fruit? | Ovary cells develop to form the fruit. |
| The primary growth of a plant adds __, and secondary growth adds __. | Height, girth |
| Food-conducting cells called vessel elements are arranged end-to-end in phloem tissue | False |
| Sieve-tube elements are short, wide water-conducting cells. | False |
| In angiosperms, the process of __ ensures that the endosperm will develop only in ovules containing egg | Double fertilization |
| How do cells in a meristem differ from other cells in a plant? | They continue to divide. |
| The relationship between a plant and mycorrhizal fungi is best described as | Mutualistic. |
| The function of a root hair is to | Increase the surface area available for absorption in plant roots. |
| __ provide(s) the major force for the movement of water and solutes from roots to leaves. | Transpiration |
| In roots the __ forces water and solutes to pass through the plasma membranes of __ cells before entering the __. | Casparian strip ... endodermis... xylem |
| Cohesion describes the tendency of water molecules to stick to the fibers of plants cells walls. | False |
| Which of the following allows plants to be selective about the molecules that enter the xylem? | A waxy barrier in the plant root |
| Adhesion describes the tendency of water molecules to stick to each other. | False |
| What is the source of most of a plant's dry mass? | Carbon dioxide |
| Transpiration describes the process by which water is lost from plants by evaporation. | True. |
| Micronutrients function in plants mainly as | Cofactors in chemical reactions |
| Auxin __. | Stimulates cell elongation in newly forming tissues. |
| What do auxin, cytokinins, gibberellins, abscisic acid,and ethylene have in common? | All of the listed hormones achieve their effects by stimulating or inhibiting cell division or cell elongation. |
| Abscisic acid was once referred to as the "abscission hormone" (hence the name). Why is the term abscisic acid really a misnomer? | Abscisic acid does not play a major role in leaf abscission. |
| Which substance induces "bolting," the rapid elongation of a plant stem? | A gibberellin |
| What term refers to seasonal changes in the relative lengths of night and day? | Photoperiod |
| __ promote(s) seed germination and __ inhibit(s) seed germination. | Gibberellins; abscisic acid |
| Felicia decides she wants to start growing bonsai trees. In her readings she learns that removing apical branches to promote "back budding" of lateral buds is the basis of the art. What delicate balance does this practice disrupt? | The balance of auxin and cytokinins within the plant body. |
| __ is the protein that plants use to sense the photoperiod | Phytochrome |
| What dense storage granules in plant cells are thought to contribute to gravitropism? | Starch |
| How do cells in a meristem differ from other cells in a plant? | They continue to divide. |
| The primary growth of a plant adds __, and secondary growth adds __. | Height; girth |
| In angiosperms, the process of __ | |
| In angiosperms, the process of __ ensures that the endosperm will develop only in ovules containing a fertilized egg | Double fertilization |
| Food-conducting cells called vessel elements are arranged end-to-end in phloem tissue. | False |
| Sieve-tube elements are short, wide water-conducting cells. | False |
| What is a disadvantage of cloning as a propagation technique? | Cloning produces monocultures that can potentially be wiped out by a single disease. |
| A root hair is a(n) __ | Extension of an individual cell and a structure that absorbs water from soil |
| Double fertilization is unique to flowering plants. How does it work? | A pollen grain delivers two sperms. One fertilizes the egg,and the other combines with two haploid nuclei to form the triploid endosperm |
| What helps regulate the movement of carbon dioxide into and out of a leaf? | Guard cells |
| The cells called sclerenchyma die as they mature, forming a rigid skeleton that helps support a growing plant. | True |
| How does plant growth change if the terminal bud is removed or its growth is otherwise hindered? | Growth of axillary buds is stimulated so the plant grows outward instead of just upward. |
| Transpiration describes the process by which water is lost from plants by evaporation. | True |
| The function of a root hair is to | increase the surface area available for absorption in plant roots. |
| Adhesion describes the tendency of water molecules to stick to each other. | False |
| What is the source of most of a plant's dry mass? | Carbon dioxide |
| The relationship between a plant and mycorrhizal fungi is best described as | Mutualistic |
| Which of the following allows plants to be selective about the molecules that enter the xylem? | A waxy barrier in the plant root. |
| __ provide(s) the major force for the movement of water and solutes from roots to leaves. | Transpiration |
| In roots the __ forces water and solutes to pass through the plasma membranes of __ cells before entering the __. | Casparian strip...endodermis...xylem |
| Cohesion describes the tendency of water molecules to stick to the fibers of plants cells walls. | False |
| Micronutrients function in plants mainly as | Cofactors in chemical reactions. |
Created by:
drho1