Question

Lysigenous cavity is present in:

• A. Stem of Helianthus
• B. Root of Helianthus
• C. Root of Zea mays
• D. Stem of Zea mays

Answer 1

The correct option is D

Stem of Zea mays

The correct option is D.

Explanation of the correct option:

1. Maize, the primary crop is maize (Zea mays), commonly known as corn in various nations.
2. The lysigenous cavity is the secretory depression formed by the decomposition of cells in a tissue.
3. In monocot stems as in maize, some of the protoxylem cells disintegrate and form a lysigenous depression, it is called protoxylem lacuna.
4. These are not found in monocot root, dicot root, or dicot stem.
5. As we had previously read, monocots have lysigenous cavities in their stems.
6. Because Zea mays is a monocot plant and the lysigenous chamber is present in the stem, this choice is appropriate.
7. Stem of Zea mays has a spherical shape and a clearly defined epidermis, hypodermis, ground tissue, as well as numerous dispersed vascular bundles.

Explanation of the Incorrect option:

Option A:

1. The sunflower is a member of the aster family of herbaceous plants and belongs to the genus Helianthus (Asteraceae).
2. It blooms annually, like this plant (an angiosperm).
3. Since it is annual, the stem has no lateral meristems or growth rings, which you may see in a stem made of wood.
4. The vascular bundles of the dicot helianthus plant form a ring around the stem.

Option B:

1. The sunflower is a member of the aster family of herbaceous plants and belongs to the genus Helianthus (Asteraceae).
2. It blooms annually, like this plant (an angiosperm).
3. Sunflowers (Helianthus spp.) have secondary roots that are smaller and hairier and a single taproot.
4. Typically, sunflower roots spread out 1 to 3 feet deep.
5. Helianthus (sunflower) is a dicotyledonous plant, hence no lysigenous is present in the root or stem of the helianthus plant, in accordance with the question.

Option C:

1. Large voids in water plants, some monocots' stems, and the major resin ducts of mangos are examples of lysigenous types of cavities.
2. Water, gases, and oil can be stored in these cavities. Maize, Zea mays, is a monocot plant.

Final answer: Lysigenous cavity is present in stem of Zea mays.