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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
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Underground parts of a plant are not always roots
Justify the following statements on the basis of external features
Flower is a modified shoot
Roots are
Draw and label the parts of regions of root.
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Draw and label the parts of regions of root.
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Root formed from prolongation of the radicle is ______.
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- Root hair zone
- Zone of meristems
- Rootcap zone
- Zone of maturation
- Zone of elongation
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Name the body part modified for food storage in the following:
Carrot ______.
Name the body part modified for food storage in the following:
Sweet potato ______.
Name the body part modified for food storage in the following:
Asparagus ______.
Name the body part modified for food storage in the following:
Dahlia ______.
Name the body part modified for food storage in the following:
Portulaca ______.
Give two examples of roots that develop from different parts of the angiospermic plant other than the radicle.
