🎴 Flashcard Mode
Internal structure of leaf (dicot and monocot) - class-XI
Card1 / 47
Mastered0
Review0
QuestionClick to flip
Match the columns.
| A) | Syntheticauxin | i) | Zeatin |
|---|---|---|---|
| B) | Natural cytokinin from coconut milk | ii) | IBA |
| C) | naturalauxin | iii) | Kinetin |
| D) | purine from herring sperm DNA | iv) | NAA |
AnswerClick to flip back
A
$A-iv,B-i,C-ii,D-iii$
💡 Explanation:
A synthetic auxin (NAA) suppresses secondary wall cellulose synthesis and enhances elongation in cultured cotton. Zeatin is a cytokinin derived from adenine, which occurs in the form of a cis- and a trans-isomer and conjugate. Five naturally occurring (endogenous)auxins in plants include indole-3-acetic acid, 4-chloroindole-3-acetic acid, phenylacetic acid, indole-3-butyric acid, and indole-3-propionic acid. The mechanism of production of kinetin in DNA is thought to be via the production of furfural — an oxidative damage product of deoxyribose sugar in DNA — and its quenching by the adenine base's converting it into N6-furfuryladenine, kinetin. So the correct option is
' A−iv,B−i,C−ii,D−iii'.