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प्रश्न
A free-living nitrogen-fixing cyanobacterium which can also form a symbiotic association with the water fern Azolla
पर्याय
Nostoc
Anabaena
chlorella
Rhizobium
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उत्तर
Anabaena
संबंधित प्रश्न
Read the given statements and select the correct option.
- Hydrophytes possess aerenchyma to support themselves in water.
- Seeds of Viscum are positively photoblastic as they germinate only in presence of light.
- Hygroscopic water is the only soil water available to roots of plants growing in soil as it is present inside the micropores.
- High temperature reduces use of water and solute absorption by roots.
Read the given statements and select the correct option.
Statement A: Cattle do not graze on weeds of Calotropis.
Statement B: Calotropis have thorns and spines, as a defense against herbivores.
In soil water available for plants is
The plant of this group are adapted to live partly in water and partly above substratum and free from water
In a fresh water environment like pond, rooted autotrophs are
Sticky glands of Boerhaavia and Cleome support
Soil formation can be initiated by biological organisms. Explain how?
Describe the mutual relationship between the fig and wasp and comment on the phenomenon that operates in this relationship.
What is myrmecophily?
What is a seed ball?
What are the advantages of seed dispersal?
Describe the dispersal of fruit and seeds by animals.
Identify the A, B, C, and D in the given table
| Interaction | Effects on species X | Effects on species Y |
| Mutualism | A | (+) |
| B | (+) | (-) |
| Competition | (-) | C |
| D | (-) | 0 |
What is the soil profile? Explain the characters of different soil horizons.
