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प्रश्न
A free-living nitrogen-fixing cyanobacterium which can also form a symbiotic association with the water fern Azolla
विकल्प
Nostoc
Anabaena
chlorella
Rhizobium
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उत्तर
Anabaena
संबंधित प्रश्न
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
Ophrys an orchid resembling the female of an insect so as to able to get pollinated is due to phenomenon of
In a fresh water environment like pond, rooted autotrophs are
Strong, sharp spines that get attached to animal’s feet are found in the fruits of
Sticky glands of Boerhaavia and Cleome support
The organic horizon is generally absent from agricultural soils because tilling, e.g., plowing, buries organic matter. Why is an organic horizon generally absent in desert soils?
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 is co-evolution?
Explain Raunkiaer classification in the world’s vegetation based on the temperature.
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 |
Column I represent the size of the soil particles and Column II represents the type of soil components. Which of the following is the correct match for the Column I and Column IL
| Column - I | Column - II | ||
| I) | 0.2 to 2.00 mm | i) | Slit soil |
| II) | Less than 0.002 mm | ii) | Clayey soil |
| III) | 0.002 to 0.02 mm | iii) | Sandy soil |
| IV) | 0.002 to 0.2 mm | iv) | Loamy soil |
What is the soil profile? Explain the characters of different soil horizons.
