Calvert 5th Grade Science--Unit 1 Topic 6
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- Define embryo
- the immature plant inside a seed
- Define seed coat
- the outer covering of a seed
- Define fruit
- the ripened ovary of a flowering seed plant
- What is an imperfect flower?
- They have either a pistil or a stamen but not both.
- What is a complete flower?
- Complete flowers have sepals, petals, stamens, and pistils.
- Define ovary
- a structure containing egg cells
- What is an incomplete flower?
- Incomplete flowers are missing either a sepal, a petal a stamen or a pistil.
- What happens during cross-pollination?
- The transfer of pollen is from one flower to the flower of another plant.
- Define pollination
- the transfer of a pollen grain to the egg-producing part of a plant
- What is a perfect flower?
- A perfect flower has both female and male parts, that is, both pistils and stamens.
- What happens during self-pollination?
- The pollen is transfered from an anther to a stigma in the same flower.
- What is seed dispersal?
- Seed dispersal is when a seed moves from the flower to a place where it can sprout.
- What is germination?
- Germination is what happens when a seed actually sprouts. The right conditions will allow a seed to germinate.
- Give three examples of how seeds are dispersed?
- Through wind, water and animals
- Explain how seeds are produced.
- A pollen grain is transferred from the anther to the stigma. On the stigma, a tube forms from the pollen grain to the ovary. A sperm travels down the tube and fertilizes the egg cell. A seed develops from the fertilized egg cell.
- What is vegetative propagation?
- When you grow new plants from pieces of a plant that already exists--such as a stem, a leaf or a root, rather than from seeds.
- Describe the difference between fertilization and germination?
- In fertilization, a sperm cell combines with an egg cell; in germination, a fertilized seed sprouts.