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Life Science
| Term | Definition |
|---|---|
| egg shell | The shell is seen from the outside, and is a hard, protective covering made of calcium carbonate. The shell has 7,000+ tiny pores to let gases into and out of the shell. Carbon dioxide is given off through the pores and is replaced by oxygen. |
| germinal disc | The small white spot on the yolk is the germinal disc. This is where the mother hen's genetic material is found. |
| Chalazae | Are white cords attached to the yolk sac. They are made of twisted strands of mucin fibers that are a special form of protein. The chalazae holds the yolk in the middle of the egg. |
| egg white | The clear liquid contained within an egg. In chickens it is formed from the layers of secretions of the anterior section of the hen's oviduct during the passage of the egg. |
| yolk | The yellow, inside part of a bird's egg, which is surrounded by the egg white, is rich in protein and fat, and feeds the developing embryo. |
| air cell | An air cell forms at the largest end of the egg. While the chick is growing, the shell membranes surround the white/albumen of the egg. The albumen provides the liquid and also contains a sizable amount of the protein necessary for proper growth. |
| axillary bud | a bud that develops in the axil |
| stem | (axis) main support system of plant |
| internode | the area of stem between two (adjacent) nodes |
| node | the part of the stem of a plant where a leaf, branch, or aerial root grows (plants have many or more than one) |
| tap root | the main root of some plants, it extends straight down under the plant |
| terminal bud | a bud located at the apex of the stem they have special tissue that can divide indefinitely |
| flower | the reproductive unit of angiosperms |
| flower stalk | the structure that supports flowers and connect it to the plant |
| axil | the angle between the upper side of the stem, leaf, branch, or petiole |
| lateral shoot (branch) | an offshoot of the stem of a plant |
| leaf | an outgrowth of a plant that grows from a node in the stem most leaves are flat and contain chloroplasts; their main function is to carry out photosynthesis (sunlight energy- chemical energy) |
| petiole | a leaf stalk; it attaches the leaf to the plant and is supportive to the leaf |
| root | a structure that gives support to the plant and obtains food and water from the soil, stores energy, and grows underground |
| root cap | a structure at the ends of roots. it covers and protects the actively growing region of the root |
| stigma | the receptive tip of a carpel in the gynoecium of a flower |
| style | the long slender stalk that connects the stigma and ovary |
| ovary | hollow base of the carpel that hosts the ovules |
| ovule | the part of the ovary of seed plants that contains the female germ cell and after fertilization becomes a seed |
| pistil | the female organs of a flower |
| anther | part of the stamen that contains pollen |
| stamen | the male fertilizing organ of the flower containing anther and filament |
| filament | a long slender stalk that' part of the stamen |
| sepal | each of the parts of the calyx of a flower, enclosing petals and are green and leaflike |
| petal | modified leaves, usually colored, that are segments of the corolla of a flower |
Created by:
tshay.5
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