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After double fertilization, a zygote and ________ form.
a. an ovule
b. endosperm
c. a cotyledon
d. a suspensor
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- The fertilized ovule gives rise to the ________. a. fruit b. seed c. endosperm d. embryoThe small opening in the integument(s) of the angiosperm egg sac through which the pollen tube enters is known as the _________. Select one: a. Microtubule b. Megapyle c. Venter d. Neck-ring cells e. Micropyle f. none of these choicesThe arrival of pollen grains on a receptive stigma is called_____ . a. germination c. pollination b. fertilization d. propagation
- Double fertilization results in __________________________. a. a diploid zygote and triploid endosperm in each seed b. a spare sperm nucleus c. two diploid zygotes in every seed d. none of these answers is correct e. three diploid zygotes; one of the three will form will develop into a sporophyte embryo in a seed, one will die and the third will migrate out of the megasporangium and form a separate male plantThe seed coat forms from the______ . a. integuments c. endosperm b. coleoptile d. sepalsThe stamen consists of a long stalk called the filament that supports the ________. a. stigma b. sepal c. style d. anther
- The_____ of a flower contains one or more ovaries in which eggs develop, fertilization occurs, and seeds mature. a. pollen sac c. receptacle b. carpel d. sepalMost gymnosperm seeds _______________. Select one: a. have attached wings to aid in dispersal b. grow as groups in thick pouches inside of woody cones c. have very little viability d. possess no seed coat e. none of the above answers f. have triploid endosperm, the product of double fertilizationA. Pollen tube B. C. Which part of this angiosperm egg will become the endosperm? D B E A с D. E.
- The ________ are collectively called the calyx. a. sepals b. petals c. tepals d. stamensA seedling germinating under a stone grows at an angle away from the stone and upward. This response to touch is called ________. a. gravitropism b. thigmonasty c. thigmotropism d. skototropismIn a plant’s male reproductive organs, development of pollen takes place in a structure known as the ________. a. stamen b. microsporangium c. anther d. tapetum