In angiosperms, each pollen grain produces two sperm. what do these sperm do? view available hint(s) a) one fertilizes an egg, and the other fertilizes the fruit. b) both sperm fertilize a single egg cell. c) one fertilizes an egg, and the other is kept in reserve. d) each one fertilizes a separate egg cell. e) one fertilizes an egg, and the other combines with two polar nuclei, which develop into stored food cells (endosperm).

E

Explanation:

Angiosperms are group of plants that produce flowers used for sexual reproduction. Prior to fertilization, pollination must occur, which is when a pollen grain produced by the stamen of a male flower, is conveyed to the carpel of a female flower. The pollen grain is an enclosed structure that grows a pollen tube upon landing on the sticky stigma of a female flower. The cells in an ovule (present in the ovary) undergoes division to produce an egg cell and two other cells known as polar nuclei (all haploid, n).

Two haploid sperm cells are released via the pollen tube produced by the pollen grain; one of them fuses with the egg cell to form a diploid zygote (2n), while the other sperm cell fuses with the two polar nuclei to form a triploid endosperm.

Ultimately, the zygote will develop into an embryo while the endosperm will serve as a source of nourishment to the developing embryo. This overall process known as DOUBLE FERTILIZATION is peculiar to angiosperms.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.