A lateral branch with short internodes and each node bearing a rosette of leaves and a tuft of roots is found in aquatic plants like
A. Pistia and Eichhornia
B. Mine and jasmine
C. Banana, pineapple, and Chrysanthemum
D. Opuntia and Euphorbia
Solution
Answer
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Hint: A part of a branch or stem through which a plant can replicate asexually and produce a new daughter plant is called an offset. Offset is one internode long runner, and every node bears a phylloclade rosette of leaves and a tuft of roots. Plants use offset as a type of vegetative reproduction. These are clones of plants and are genetically the same as them. These are developed by the plant’s main stem’s mitotic division.
Complete Step-by-step answer:
Offsets are a vegetative portion of a plant. They are produced by mitosis as this division takes place in somatic cells. Offsets are daughter plants that are genetically like the parent and are generated by asexual reproduction. Offsets are one internode long, dense, small runners which bear a cluster of leaves in a rosette type at the water or ground level and adventitious roots under water or ground level that arise from all nodes, e.g., Eichhornia crassipes, Pistia (water lettuce), etc.
In Eichhornia and Pistia, the stem is like a runner in which it branches to form leaves at the apex and roots below. The roots are found close to the surface of the water because both plants are hydrophytes. The function of offset is to disseminate plant species by propagating toward a new niche. Offsets form once the meristem area of plants, like homologous structures or axillary buds, differentiate into a new plant with the capacity to become self-sustaining. This is common in species that develop underground storage organs, like corms, bulbs, and tubers. Lilies and tulips are examples.
Therefore the correct answer is Option A.
Note: Aquatic plants are plants that have adapted to living water environments (freshwater or saltwater). They are also called macrophytes or hydrophytes to differentiate them from algae and other microphytes. A macrophyte is a plant that grows in or close to the water and is either submerged, emergent or floating.
Complete Step-by-step answer:
Offsets are a vegetative portion of a plant. They are produced by mitosis as this division takes place in somatic cells. Offsets are daughter plants that are genetically like the parent and are generated by asexual reproduction. Offsets are one internode long, dense, small runners which bear a cluster of leaves in a rosette type at the water or ground level and adventitious roots under water or ground level that arise from all nodes, e.g., Eichhornia crassipes, Pistia (water lettuce), etc.
In Eichhornia and Pistia, the stem is like a runner in which it branches to form leaves at the apex and roots below. The roots are found close to the surface of the water because both plants are hydrophytes. The function of offset is to disseminate plant species by propagating toward a new niche. Offsets form once the meristem area of plants, like homologous structures or axillary buds, differentiate into a new plant with the capacity to become self-sustaining. This is common in species that develop underground storage organs, like corms, bulbs, and tubers. Lilies and tulips are examples.
Therefore the correct answer is Option A.
Note: Aquatic plants are plants that have adapted to living water environments (freshwater or saltwater). They are also called macrophytes or hydrophytes to differentiate them from algae and other microphytes. A macrophyte is a plant that grows in or close to the water and is either submerged, emergent or floating.
Last updated date: 18th Sep 2023
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