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?
Expert
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.
Specify the main parts of the ferns?
Is embryonic growth in birds direct or indirect? Answer: The embryonic growth is direct, there is no larval phase.
What do you mean by the gonads? Specify the male and the female gonads within the humans?
Whether neural impulse which is generated by stimulus that triggers the arch reflex is restricted in the neurons of this circuit?
Is fecundation in mammals external or internal?
Why can the amnion also be taken as an adaptation to terrestrial life?
Specify the two main ions which participate within the electrical impulse transmission in the neurons?
Briefly describe the reasons for uneven distribution of the population?
What are the different types of antigenic agents which might comprise vaccines?
Describe how is nervous system of nematodes managed? Name the place where neural chords are situated in their body?
18,76,764
1956840 Asked
3,689
Active Tutors
1437044
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!