Ans (a) - Fertilization and germination are two events of sexual reproduction in plants. The main difference between fertilization and germination is that fertilization is the fusion of gametes, which forms the zygote whereas germination is the development of a plant from seed or spore under favorable conditions.Ans (b) - An ovule is a female reproductive structure in seed plants that contains a tiny female gametophyte. The gametophyte produces an egg cell. ... A grain of pollen is a tiny male gametophyte enclosed in a tough capsule (see Figure below). It carries sperm to an ovule while PREVENTING it from drying out.Ans (c) - (1) -The fertilized egg stays in the fallopian tube for about 3 to 4 days. But within 24 hours of being fertilized, it starts dividing fast into many cells. It keeps dividing as it moves SLOWLY through the fallopian tube to the uterus. Its next job is to attach to the lining of uterus. (2) - As fertilization occurs, the zygote is formed which later develops into an embryo. The ovary develops into a fruit and the ovule develops into a seed after fertilization. As the embryo develops, the fertilized ovule develops into a seed. (3) - The fertilised ovule goes on to form a seed, which contains a food store and an embryo that will later grow into a new plant. The ovary develops into a fruit to protect the seed. (4) - After fertilization the sepals, petals and stamens of the flower WITHER and fall off. The pistil however, remains attached to the plant. The zygote develops into the embryo and the ovules develop into the seed. The ovary develops into the fruit which develops a thick wail CALLED pericarp that is protective in functionExplanation:Hope it will help you...