Crayfish
Plants
More Plants
Even More Plants
Birds and Mammals
100
Exoskeleton
What is a body covering, typically made of chitin, that provides support and protection?
100
Botany
What is the study of plants?
100
Leaf Margin
What are the characteristics of the leaf edge?
100
Perfect Flowers
What are flowers with both stamens and carpels?
100
Placenta
What is the structure that allows an embryo to be nourished with the mother's blood supply?
200
Abdomen
What is the body region posterior to the thorax?
200
Perennial Plants
What are plants that grow year after year?
200
Biennial Plants
What are plants that live for two years?
200
Gravitropism
What is a growth response to gravity?
200
Contour Feathers
What are feathers with hooked and smooth barbules, allowing the barbules to interlock?
300
Cephalothorax
What is a body region composed of the head and thorax fused together?
300
Pollen
What is a fine dust that contains the sperm of seed-producing plants?
300
Xylem
What is the nonliving vascular tissue that carries water and dissolved minerals from the roots of a plant to its leaves?
300
Imperfect Flowers
What are flowers with either stamens or carpels, but not both?
300
Gestation
What is the period of time during which an embryo develops before being born?
400
Compound eye
What is an eye made of many lenses, each with a very limited scope?
400
Deciduous plant
What is a plant that loses its leaves for winter?
400
Leaf Mosaic
What is the arrangement of leaves on the stem of a plant?
400
Phototropism
What is a growth response to light?
400
Down Feathers
What are feathers with smooth barbules but no hooked barbules?
500
Statocyst
What is the organ of balance in a crustacean?
500
Phloem
What is living vascular tissue that carries sugar and organic substances throughout a plant?
500
Annual Plants
What are plants that live for only one year?
500
Thigmotropism
What is a growth response to touch?
500
Mammary Glands
What are specialized organs in mammals that produce milk to nourish the young?
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