Embryology

Question 1

ectoderm

Answer 1

epidermis (hair, nails, epithelium of nose, mouth and anal canal), lens and retina of eye, nervous system, inner ear

Question 2

endoderm

Answer 2

epithelial lining of respiratory and digestive tracts, parts of liver, pancreas, thyroid, and bladder lining

Question 3

mesoderm

Answer 3

musculoskeletal system, circulatory system, excretory system, gonads, connective tissues, portions of digestive and respiratory organs

Question 4

morula

Answer 4

solid ball of embryonic cells

Question 5

blastula

Answer 5

hollow sphere of cells with a fluid-filled cavity called the blastocoel; embryo implants on the uterine wall

Question 6

gastrula

Answer 6

three-layered structure responsible for differential development

Question 7

epicotyl

Answer 7

plants: precursor of the upper stems and leaves

Question 8

cotyledons

Answer 8

plants: seed leaves
- dicots have 2
- monocots have 1

Question 9

hypocotyl

Answer 9

plants: develops into the lower stem and root

Question 10

endosperm

Answer 10

plants: grows and feeds the ebryo

- in dicots, the cotyledon absorbs the endosperm

Question 11

seed coat

Answer 11

plants: develops from the outer covering of the ovule; embryo and seed coat comprise the seed