A. An embryo sac (ovule) contains eight haploid nuclei. B. Three nuclei become three synergids, 2 polar nuclei, 3 antipodal nuclei. A.If statement A is wrong and B is correct. B.If both statements are wrong. C.If both statements are correct. D.If statement A is correct and B is wrong.
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A. An embryo sac (ovule) contains eight haploid nuclei.
B. Three nuclei become three synergids, 2 polar nuclei, 3 antipodal nuclei.
| A.If statement A is wrong and B is correct. |
| B.If both statements are wrong. |
| C.If both statements are correct. |
| D.If statement A is correct and B is wrong. |
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- 2. A. An embryo sac (ovule) contains eight haploid nuclei.B. Three nuclei become three synergids, 2 polar nuclei, 3 antipodal nuclei. A.If statement A is wrong and B is correct. B.If both statements are wrong. C.If both statements are correct. D.If statement A is correct and B is wrong. 3. A. Inside a pollen grain there is a tube cell and generative cell. B. Generative cell divides to produce two sperm cells while the tube cell becomes pollen tube elongates along the style. A.If both statements are correct. B.If statement A is wrong and B is correct. C.If statement A is correct and B is wrong. D.If both statements are wrong.Which type of life cycle has both a haploid and diploid multicellular stage? a. an asexual life cycle b. diploid-dominant c. haploid-dominant d. alternation of generationsFigure 14.19 At what stage does the diploid zygote form? a. When the female cone begins to bud from the tree b. When the sperm nucleus and the egg nucleus fuse c. When the seeds drop from the tree d. When the pollen tube begins to grow
- In the course of double fertilization, one sperm cell fuses with the egg and the second one fuses with ________. a. the synergids b. the polar nuclei of the center cell c. the egg as well d. the antipodal cells2. A. The microsporangium in the anther contains numerous microsporocytes which will undergo meiosis to produce four haploid microspores. B. Each microspore develops into a pollen grain containing two sperm nuclei and one tube nucleus. A.If statement A is correct and B is wrong. B.If both statements are correct. C.If statement A is wrong and B is correct. D.If both statements are wrong.1.Embryogenesis follows while the ovary matures into fruit.B. The ovule becomes the seed. A.If both statements are correct. B.If statement A is wrong and B is correct. C.If statement A is correct and B is wrong. D.If both statements are wrong. 2. A. An embryo sac (ovule) contains eight haploid nuclei.B. Three nuclei become three synergids, 2 polar nuclei, 3 antipodal nuclei. A.If statement A is wrong and B is correct. B.If both statements are wrong. C.If both statements are correct. D.If statement A is correct and B is wrong. 3. A. Inside a pollen grain there is a tube cell and generative cell. B. Generative cell divides to produce two sperm cells while the tube cell becomes pollen tube elongates along the style. A.If both statements are correct. B.If statement A is wrong and B is correct. C.If statement A is correct and B is wrong. D.If both statements are wrong.
- In humans, gametogenesis results in the formation ofa. diploid egg and sperm cells.b. gametophytes.c. sporophytes.d. haploid egg and sperm cells.e. a zygote.The parts of an ovule include the following structures. Indicate whether each is haploid or diploid. a. Archegonium b. Egg c. Female gametophyte d. Integument e. Nucellus f. Ovuliferous scaleA tetrad of spores in an ascus is the product of a. one meiotic division.b. two meiotic divisions.c. one meiotic division followed by one mitotic division.d. one mitotic division followed by one meiotic division.
- Draw a labelled diagram of embryo sac and microsporangiumIn a life cycle with alternation of generations, multicellularhaploid forms alternate with(A) unicellular haploid forms.(B) unicellular diploid forms.(C) multicellular haploid forms.(D) multicellular diploid forms.Humans produce skin cells by mitosis and gametes by meiosis. Which of the following statements about the nuclei of skin cells is correct? a. They contain half as much DNA as the nuclei of gametes produced by meiosis. b. They contain four times as much DNA as the nuclei of gametes produced by meiosis. c. They contain the same amount of DNA as the nuclei of gametes produced by meiosis. d. They contain twice as much DNA as the nuclei of gametes produced by meiosis.