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- Which of the following is not a characteristic of plants? (a) cuticle (b) unicellular gametangia (c) stomata (d) multicellular embryo (e) alternation of generationsIn flowers, the structures that produce male gametophytes are called _______ ;the strcutures that produce female gametophytes are called _______ . a. pollen grains; flowers c. anthers; stigma b. stamen; carpels d. megaspores; microsporesFigure 23.28 Which of the following statements about the Laminaria life cycle is false? In zoospores form in the sporangia. The sporophyte is the 2n plant. The gametophyte is diploid. Both the gametophyte and sporophyte stages are multicellular.
- Male gametophytes in the pine tree are produced by which of the following processes? -Gametogenesis -Mitosis -Neither mitosis nor meiosis -Meiosis -Microsporophyte generationFemale gametophytes develop specifically within what part of the pine cone? -Pollen sac -Anther -Central cell -Microsporangium -OvuleIn flowers,the structure that produce male and female gametophytes are called______and____
- In conifers, microspores develop into- -flagellated sperm inside the pollen grain -pollen grains inside microsporangia. -the male cones. -eggs inside the ovules. -a nucellus.The formation of a tough wall of sporopollenin around the male gametophyte leads to the production of what end product? -Ovules -Eggs -Anthers -Stamens -PollenDuring fertilization in flowering plants, one sperm cell nucleus fuses with the egg nucleus, producing the diploid zygote. The other sperm nucleus fuses with the ___________________________________, producing the triploid ________________________, which develops as temporary tissue that nourishes the embryo. This process is called ___________________ fertilization. What tissue nourishes the embryo in gymnosperm seeds?
- In animals, meiosis produces gametes (sperm cells and egg cells), but that does not happen in plants. When some of the cells of a sporophyte undergo meiosis, what types of cells are produced? What do they grow into?Plants that are dioecious are best described as having: -archegonia and antheridia on separate gametophytes. -archegonia and antheridia on separate sporophytes. -archegonia and antheridia on the same gametophyte -the ability to make pollen grains via archegonia -ovules contained within antheridiaYou are studying a type of plant known as " rockcress" or Arabidopsis sp. You discover a mutant in which the central cell of the female gametophyte cannot be fertilized. What structure will not form in these mutant plants? Synergids Pollen tube Endosperm Egg cell