One generation within the other can be seen in(a) Seed inside the fruit(b) Embryo sac inside the ovule(c) Generative cell inside pollen grain(d) Microspores inside anthe

The concept of "one generation within the other" refers to the situation where one generation (the offspring) is physically located within the other generation (the parent). This is a common occurrence in the plant kingdom due to their reproductive strategies.

(a) Seed inside the fruit: The seed is the offspring of the parent plant, and it is contained within the fruit, which is a part of the parent plant. So, this is an example of one generation within the other.

(b) Embryo sac inside the ovule: The embryo sac, which contains the egg cell, is located within the ovule of the parent plant. After fertilization, the embryo (offspring) develops within this sac. So, this is also an example of one generation within the other.

(c) Generative cell inside pollen grain: The generative cell, which will divide to form sperm cells, is contained within the pollen grain. The pollen grain is produced by the parent plant and will fertilize another plant. So, this is another example of one generation within the other.

(d) Microspores inside anther: The microspores, which will develop into pollen grains, are contained within the anther of the parent plant. So, this is yet another example of one generation within the other.

So, all of the options (a, b, c, and d) are examples of "one generation within the other".