FORESTRY
PLANT AND WOOD ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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endosperm
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ectosperm
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cotyledon
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seed coat
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Detailed explanation-1: -Figure 32.7. 1: Double fertilization: In angiosperms, one sperm fertilizes the egg to form the 2n zygote, while the other sperm fuses with two polar nuclei to form the 3n endosperm. This is called a double fertilization.
Detailed explanation-2: -Double Fertilization Process Pollination helps the pollen grains to reach stigma via style. The two sperm cells enter the ovule-synergid cell. This proceeds to fertilization. In angiosperms, fertilization results in two structures, namely, zygote and endosperm, hence the name “double fertilization.”
Detailed explanation-3: -Incompatibility Genes in Flowers If plants do not have compatible genes, the pollen tube stops growing. Self-incompatibility is controlled by the S (sterility) locus. Pollen tubes have to grow through the tissue of the stigma and style before they can enter the ovule.
Detailed explanation-4: -During the double-fertilization event, one sperm cell fuses with the egg cell, forming the embryo, and a second sperm cell fertilizes the central cell, which develops into the endosperm.