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ACROSS
1)  primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves
2)  cut off the testicles (of male animals such as horses)
3)  people who are old collectively
4)  fish eggs or egg-filled ovary; having a grainy texture


DOWN
1)  any culture medium that uses ____ as the gelling agent
2)  (trademark) a child's plastic construction set for making mechanical models
3)  great merriment
4)  a condition (mostly in boys) characterized by behavioral and learning disorders

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alga
geld
aged
roes