Description of embryonic sac
Give a brief description of the term embryonic sac? Which are the cells that form embryonic sac? And also write down their ploidies?
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The embryonic sac is female gametophyte of the angiosperms. The embryonic sac is composed of three cells which remain next to micropyle, two lateral synergids and central oosphere (egg); one binucleated cell, polar nuclei, is placed in central region; three antipodal cells stay in opposite side to micropyle.
Because all of these cells come by the mitosis from functional megaspore they are haploid.
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Stimuli that contrast with the surrounding environment are more likely to be attention catching than the stimuli that blend in. a contrasting effect can be caused by color/size or any other factor that is unusual. The contrast principle states that external stimuli that stand out against the back
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