please answer all question
Q.No. 1 Name the organisms found in the root nodules of leguminous plants. 1M
Q.No. 2. Which gas is added to the atmosphere by the decay of organic matter? 1M
Q.No.3. Name two biologically important compounds that contain both oxygen and nitrogen.
Mention any four methods of preventing or reducing soil erosion. 1+2=3M
Q.No.4. How is soil formed? Explain all the four important factors that helps in the formation of soil.2+3=5M
OR
Write down the factors that influences movement of air.
Explain Land breeze and Sea breeze with labelled diagram. 2+3=5M
PLEASE MENTION PAGE NOS. ON EACH ANSWERSHEETS.
Answers
Answer:1.Rhizobium is a genus of bacteria associated with the formation of root nodules on plants. These bacteria live in symbiosis with legumes. They take in nitrogen from the atmosphere and pass it on to the plant, allowing it to grow in soil low in nitrogen.
2.Carbon dioxide is added to the atmosphere naturalParent materials when organisms respire or decompose (decay), carbonate rocks are weathered, forest fires occur, and volcanoes erupt.
3.(¡) Nucleic acids and proteins are two biologically important compounds that contain both oxygen & nitrogen.(¡¡) Preventive methods of soil erosion (i) Afforestation Planting more trees reduces soil erosion.
(ii) Contour Ploughing Ploughing land in furrows across the natural slope of the land helps trap water and prevent the washing away of top soil along with it
4.Soil minerals form the basis of soil. They are produced from rocks (parent material) through the processes of weathering and natural erosion. Water, wind, temperature change, gravity, chemical interaction, living organisms and pressure differences all help break down parent material.The major factors responsible for the formation of soil: The major factors affecting the formation of soil are relief, parent material, climate, vegetation and other life-forms and time. Besides these, human activities also influence it to a large extent
After "Or"
Temperature: the air moves from an area with high temperature to an area with low temperature. Pressure: movement of air takes place from an area with high pressure to an area with low pressure. Coriolis movement: This is the movement of air caused by the rotation of and movement of earth.
Land breeze blows during the night from land to sea and the land becomes cooler faster than the sea. The air above the sea becomes less dense (i.e. warmer) and rises. The cooler air from the land moves in to take its place. Sea breeze: Sea breeze blows during the day and the land heats up faster than the sea. +See the attachment
Answer:
1= Rhizobium is a genus of bacteria associated with the formation of root nodules on plants.
2= Carbon dioxide is added to the atmosphere naturally when organisms respire or decompose (decay), carbonate rocks are weathered, forest fires occur, and volcanoes erupt.
3= Nucleic acids and proteins are two biologically important compounds that contain both oxygen & nitrogen
Preventive methods of soil erosion (i) Afforestation Planting more trees reduces soil erosion. (ii) Contour Ploughing Ploughing land in furrows across the natural slope of the land helps trap water and prevent the washing away of top soil along with it.
4= Soil is the thin layer of material covering the earth’s surface and is formed from the weathering of rocks. It is made up mainly of mineral particles, organic materials, air, water and living organisms—all of which interact slowly yet constantly.
Soil forms continuously, but slowly, from the gradual breakdown of rocks through weathering. Weathering can be a physical, chemical or biological process:
physical weathering—breakdown of rocks from the result of a mechanical action. Temperature changes, abrasion (when rocks collide with each other) or frost can all cause rocks to break down.
chemical weathering—breakdown of rocks through a change in their chemical makeup. This can happen when the minerals within rocks react with water, air or other chemicals.
biological weathering—the breakdown of rocks by living things. Burrowing animals help water and air get into rock, and plant roots can grow into cracks in the rock, making it split.