zone of cell differentiation The hindmost region of the subapical region of a root, where tiny root hairs protrude from epidermal cells. 547
zone of cell division The meristematic part of the subapical region in a plant's root. 547
zone of cell elongation The middle part of the subapical region of a root, where rapid cellular elongation lengthens the root. 547
zooplankton ZO-O-PLANK-tun Abundant protozoa and microscopic animals in bodies of water. 458
zygomycetes zi-go-mi-SEETS Fungi that have thick, black zygospores. 478
zygospore zi-go-SPOOR Sexual structure of zygomycetes that consists of zygotes within thick black coats. 481
zygote
ZI-goat In prenatal humans, the organism during the first
2 weeks of development. Also called a preembryo. In plants, the
fused egg and sperm that grows into a sporophyte. 192
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