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- Figure 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 growIn 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; microsporesIn which part of the female flowerdoes fertilisation take place?A. FilamentB. StigmaC. OvaryD. Style
- Which of these pairs is mismatched? a. anther—produces microspores b. carpel—produces pollen c. ovule—becomes seed d. ovary—becomes fruit e. flower—is a reproductive structureHow does double fertilization occur in flowering plants?a. The two sperm in a pollen tube fertilize the two egg cells present ineach female gametophyte.b. One of the two sperm in a pollen tube fertilizes the single egg in afemale gametophyte, and the other fuses with the two nuclei presentin the central cell.c. Two sperm, one contributed by each of two different pollen tubes,fertilize the two egg cells in a single female gametophyte.d. Two sperm contributed by separate pollen tubes enter a singlefemale gametophyte; one of the sperm fertilizes the egg cell, and theother fertilizes the central cell.e. None of the above is correct.The pollen lands on which part of the flower? a. stigma b. style c. ovule d. integument
- Which suite of reproductive features distinguishes angiosperms from gymnosperms? A. The carpel, double fertilisation, endosperm formation B. Pollen-formation, double fertilisation, seed-formation C. Pollen-formation, the carpel, double fertilisation, endosperm formation D. The carpel, double fertilisation, endosperm formation, seed-formationExplain how the pollen grain and embryo sac are formed.Find out the incorrect one for vernalisation. a.Stimulus of vernalisation is perceived by embryo b.Prevents early reproductive development c.Helps to grow more than one crop in a year d.Can help to keep plant in reproductive stage for very long time
- Besides the seed, what other major structure diminishes a plant’s reliance on water for reproduction? a. flower b. fruit c. pollen d. sporeHow to extract fruit seeds from small seeds with adhering flesh? a. wash them thoroughly with water b. simply twist the nut to separate from the pseudocarp c. remove the flesh by macerating seeds with fine sand, then wash thoroughly with water d. soak them in water for 24 hrs until the adhering materials becomes soft and readily separated from the seeds. Wash with tap water.Which of the following terms is not associated with a male portion of a plant?a. megasporeb. antheridiumc. pollen grainsd. microspore