Depending on their adaptive needs, the root is modified in different ways in different plants. These changes can be ground, air or even small aircraft. The underground modifications of the stem are the leaves, tubers, roots and bulbs.
They may resemble the leaves of plants, but differ in the presence of tubercles, central rows, leaves and shoots. The main reason for the study of leaves is to enable plants to live in all kinds of situations and places that differ from the normal environment.
What is Corm?
Corms are underground extended roots that store the plant’s food while it is dormant. It has a long circular base and grows vertically underground. They look like batteries.
Unlike the bulbs, the pulp is hard and has neither peels nor fleshy leaves. As the plant grows, it uses stored food. Crocosmia, freesia and gladiolus are some examples of corms.
What is a Bulb?
The bulb is an underground root with a fleshy, bark-like layer around the central root. The base of the bulb consists of a random set of roots. Tuberous roots arise from lateral leaves and their leaves can store food.
In the middle of the bulb is an apical bud that produces leaves and flowers. Onions and garlic are good examples of grilling.
Differences Between Corm and Bulb
| Bulbs | Corms |
| Morphological Features | |
| Bulbs are structurally short stems with fleshy leaves or leaf bases. | Corms are rounded, underground storage organs consisting of a swollen stem base covered with scale leaves. |
| Types | |
| Bulbs are modified leaves that store nutrients. | Corms are swollen stem bases. |
| Features | |
| Bulbs comprise scales, which are the modified leaves. | Corms comprise smooth modified stems. |
| Shape | |
| A bulb is roughly spherical or pyriform in outline. | It may be spherical, elongated or vertically compressed. |
| Stem | |
| The bulb is a condensed underground shoot. | The corm is an underground stem. |
| Buds | |
| The buds of a bulb are borne internally. | The buds of a corm are borne externally. |
| Nodes | |
| Clear-cut nodes are absent. | A corm bears distinct circular nodes. |
| Cork | |
| Corky covering is absent. | The corm is surrounded by cork. |
| Tunic | |
| A tunic is absent. | A tunic is present. |
| Food storage | |
| Food is stored in the leaf bases. | Food is stored in the stem. |
| Offsprings | |
| New bulbs replace the old bulb which gets decayed. | New corms arise on the sides or above the old corm. |
| Examples | |
| Daffodils, hyacinths, allium, onion, and tulips are examples of bulbs. | Gladiolus, freesia, and crocus are examples of corms. |
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