1.

Allochemicals are(a) chemicals produced by a species which affects other species(b) sex hormones(c) produced by epiphytes(d) a positive interaction

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Answer is : (a) chemicals produced by a species which affects other species

Allochemicals are chemicals produced by a species which affects other species, e.g. Chlorella, a common alga, produces a bacteriocide that not only kills bacteria but also retards the growth of Daphnia, which feeds on Chlorella.



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