Which of the following types of roots are correctly matched with their examples? I. Apogeotropic roots: Rhizophora II. Absence of calyptra: Lemna III. Velamen containing roots: Vanda IV. Moniliform roots: Portulaca

Question

Which of the following types of roots are correctly matched with their examples? I. Apogeotropic roots: Rhizophora II. Absence of calyptra: Lemna III. Velamen containing roots: Vanda IV. Moniliform roots: Portulaca, I and II, III and IV, I, II and IV, I, II, III and IV

MARKS App · Accepted Answer

Apogeotropic means negatively geotropic roots. They are seen in halophytes that grow in oxygen-deficient soil. So the root grows vertically upwards. They are also called pneumatophores. They are seen in Rhizophora, Sonneratia, Heritiera, etc. The Calyptra is a root cap. It is absent in hydrophytes that float on water such as Lemna, Pistia, etc. Velamen is hygroscopic roots found in epiphytes (plants which grow on large trees) such as Vanda . Moniliform roots are beaded roots found in Mimordica, Portulaca, etc.

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