question_answer 13)

Differentiate between : (a) Hypocotyl and epicotyl; (b) Coleoptile and coleorhiza; (c) Integument and testa; (d) Perisperm and pericarp.  

Answer:

(a) Hypocotyl. The cylindrical position below the level of cotyledons is called hypocotyl. Epicotyl. The portion of embryonal axis above the level of cotyledons is called epicotyl. (b) Coleoptile. Epicotyl has shoot apex and a few leaf primordia enclosed in a hollow foliar structure called coleoptile. Coleorrhiza. Embryonal axis has the radicle and root cap enclosed in an undifferentiated sheath called coleorrhiza. (c) Integument. Protective envelope of ovule. Testa. Outer seed coat. (d) Perisperm. It is the residual persistent nucellus. Pericarp. Covering of fruit (fruit wall).