Does the embryo have any leaves? if so, how many? if the embryo has 12 chromosomes, how many chromosomes does a bean or corn sperm cell have? how many chromosomes does a bean or corn egg cell have?

Yes, embryos have leaves which are known as cotyledons.

Plants with two embryonic leaves are termed dicotyledonous ("dicots") .

Plants with one leave are known as monocotyledon.

Six (6) Chromosomes.

As embryo is formed from the combination of egg and sperm. If embryo has 12 chromosomes then sperm will have half means 6 chromosomes.

Six (6) Chromosomes.

As embryo is formed from the combination of egg and sperm. If embryo has 12 chromosomes then egg of a bean or corn will have half means 6 chromosomes.

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave

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