Biology, 23.11.2019 04:31 raven82914
You have learned that the fusion of egg and sperm produces a zygote. but how does the sperm reach the egg, and how does the zygote develop into a seed, which eventually germinates and grows into a mature sporophyte? in this activity, you will demonstrate your understanding of double fertilization and seed development in angiosperms.
drag the statements to their appropriate locations on the flowchart of pollination, fertilization, and seed development.
a. pollen tube grows down the style
b. generative, cell divides, forming 2 sperm
c. 2 sperm are discharged into the female gametophyte
d. sperm fuse with the egg & 2 polar nuclei
e. zygote forms & divides into a terminal cell & a basal cell
f. cells of the embryo differentiate into three tissue types
Answers: 3
Biology, 21.06.2019 20:00
Which of the following is most important in making the typical seed more resistant to adverse conditions than the typical spore? a) a different type of sporopollenin b) an internal reservoir of liquid water c) integument(s) d) ability to be dispersed e) waxy cuticle
Answers: 1
Biology, 22.06.2019 06:00
In tomato plants, mendel found that the allele for smooth seeds (s) is dominant, while the allele for wrinkled seeds (s) is recessive. which of these punnett squares shows crosses between two plants heterozygous for smooth seeds? i need this to be answered as soon as ! sry the picture is bad quality
Answers: 3
Biology, 22.06.2019 13:20
Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.
Answers: 1
Biology, 23.06.2019 00:30
What is the name of the protein found in erythrocytes that transports respiratory gases and provides the red color?
Answers: 2
You have learned that the fusion of egg and sperm produces a zygote. but how does the sperm reach th...
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