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प्रश्न
Roots obtain oxygen from air in the soil for respiration. In the absence or deficiency of O2, root growth is restricted or completely stopped. How do the plants growing in marshlands or swamps obtain their O2 required for root respiration?
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उत्तर
In some plants such as Rhizophora and Sonneratia (mangrove plant) growing in swampy areas near river mouths (saline marshy soil or halophytes), many roots come out of the ground and grow vertically upwards (negatively geotropic: against gravitational force). Such roots, called pneumatophores or breathing roots or respiratory roots, help to get oxygen for respiration.
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संबंधित प्रश्न
Justify the following statements on the basis of external features
Flower is a modified shoot
Differentiate between Fibrous root and adventitious root
Draw and label the parts of regions of root.
How root climbers differ from stem climbers?
Correlate with respect to modification of root for storage of food.
Carrot: Tap root :: ______ : Adventitious root
Root formed from prolongation of the radicle is ______.
Rearrange the following zones as seen in the root in vertical section and choose the correct option.
- Root hair zone
- Zone of meristems
- Rootcap zone
- Zone of maturation
- Zone of elongation
Roots developed from parts of the plant other than radicle are called ______.
In swampy areas like the Sunderbans in West Bengal, plants bear special kind of roots called ______.
Name the body part modified for food storage in the following:
Carrot ______.
Name the body part modified for food storage in the following:
Radish ______.
Name the body part modified for food storage in the following:
Dahlia ______.
The essential functions of roots are anchorage and absorption of water and minerals in the terrestrial plant. What functions are associated with the roots of aquatic plants. How are roots of aquatic plants and terrestrial plants different?
Rhizome of ginger is like the roots of other plants that grows underground. Despite this fact ginger is a stem and not a root. Justify.
