Multiple ChoiceWhich one of the following is true of seed plants but not true of seedless plants? 1544views
Multiple ChoiceThe closest seedless relatives of seed plants produce one kind of spore that gives rise to a bisexual gametophyte. What does this suggest about the ancestors of seed plants? 1062views
Multiple ChoiceThe eggs of seed plants are fertilized within ovules, and the ovules then develop into __________. 887views
Multiple ChoiceThe cells within pollen grains are __________ and together comprise the __________. 772views
Multiple ChoiceBesides the plant tissue that humans ingest, which angiosperm tissue is most directly important for human survival? 491views
Multiple ChoiceSix major cropswheat, rice, maize, potatoes, cassava, and sweet potatoescontribute disproportionately to human diets. What percentage of all the calories consumed by humans is supplied by these crops? 787views
Multiple ChoiceWhich of the listed examples is evidence provided by living gymnosperms of an evolutionary transition between seedless and seed plants? 417views
Multiple ChoiceWhich of the following best states the advantages that seeds have over spores? 1666views1rank
Multiple ChoiceWhich gymnosperm phylum is characterized by large cones and fern-like leaves and thrived during the Mesozoic? 660views
Multiple ChoiceDietary supplements and decongestants containing ephedrine have recently become more strongly regulated in the United States. Which phylum contains the plant from which ephedrine is extracted? 372views
Multiple ChoiceWhat global change occurring between the Carboniferous period and the Permian period likely contributed to the success of the gymnosperms? 868views
Multiple ChoiceIn ovulate cones, megasporocytes undergo __________ and produce __________ megaspores. 424views
Multiple ChoiceIn a typical conifer, how long does it take for fertilization to occur after pollination? 824views
Multiple ChoiceWhich types of angiosperms would most likely be wind-pollinated rather than animal-pollinated? 1062views
Multiple ChoiceThe vast majority of angiosperms with two cotyledons formerly classified as __________ are now classified as __________. 365views
Multiple ChoiceLike gymnosperms, many grasses and angiosperm trees are wind-pollinated. To conserve energy, these angiosperms do not produce complete flowers (complete flowers have all four of the basic parts). Which part would be unnecessary for wind-pollinated angiosperms? 799views
Multiple ChoiceIn gymnosperms, the seed coat develops from the integument. In angiosperms, the seed coat develops from the __________. 889views
Multiple ChoiceDuring pollination, pollen grains are transferred from the __________ to the __________. 1056views
Multiple ChoiceA pea pod is formed from __________. A pea inside the pod is formed from __________. 548views
Multiple ChoiceAfter fertilization, the __________ develops into a seed, and the __________ develops into a fruit. 836views1rank
Multiple ChoiceThe pollen tube releases two sperm cells into the embryo sac. The result of this is the __________. 858views
Multiple ChoiceOf the following, which is a difference in how reproduction occurs in gymnosperms compared to angiosperms? 1188views1rank
Textbook QuestionAngiosperms are different from all other plants because only they have a. a vascular system. b. flowers. c. seeds. d. a dominant sporophyte phase.769views
Textbook QuestionWhich of the following structures produce eggs and sperm? (Explain your answer.) a. fern sporophytes b. moss gametophytes c. the anthers of a flower d. moss sporangia542views
Textbook QuestionThe eggs of seed plants are fertilized within ovules, and the ovules then develop into a. seeds. b. spores. c. fruit. d. sporophytes.778views
Textbook QuestionThe diploid sporophyte stage is dominant in the life cycles of all of the following except a pine tree. a rose bush. a fern. a moss.815views
Textbook QuestionWhich of the following terms includes all the others? a. angiosperm b. gymnosperm c. vascular plant d. fern e. seed plant480views
Textbook QuestionExplain the difference between homosporous and heterosporous plants. Where are the microsporangium and megasporangium found in a tulip? What happens to the spores that are produced by these structures?968views
Textbook QuestionCompare a seed plant with an alga in terms of adaptations for life on land versus life in the water.368views