Which of the following plants are used as green manure in crop fields and in sandy soils:
- Crotalaria juncea and Alhagi camelorum
- Calotropis procera and Phyllanthus niruri
- Saccharum munja and Lantana camara
- Dichanthium annulatum and Azolla nilotica
The Correct Option is A
Solution and Explanation
Crotalaria juncea and Alhagi camelorum are commonly used as green manure in crop fields and in sandy soils. These plants have nitrogen-fixing properties, which can help enrich the soil with nitrogen and improve its fertility, making them valuable for agricultural purposes.
So, the correct option is (A): Crotalaria juncea and Alhagi camelorum
Top Questions on Microbes in human welfare
Answer the following questions:
1. State what do you understand by “MALT”? Where is it located inside our body?
2. Explain cytokine barriers.
3. Name the diagnostic test for AIDS. On what principle does it work?
4. Bone marrow and thymus play an important role in human immune system. Explain how are they able to achieve this.- CBSE CLASS XII - 2025
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- Microbes in human welfare
- Explain how cyanobacteria can be used as bio-fertilizer.
- CBSE CLASS XII - 2025
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Name an alcoholic drink which is produced with the help of microbes:
(1) With distillation
(2) Without distillation- CBSE CLASS XII - 2025
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Match the items in Column-A with that of Column-B:
- CBSE CLASS XII - 2025
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OR
(B)- [(i)] How do secondary lymphoid organs provide immunity?
- [(ii)] Highlight the role of spleen as an organ that provides immunity.
- CBSE CLASS XII - 2025
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- Microbes in human welfare
Questions Asked in NEET exam
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A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :
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The output (Y) of the given logic implementation is similar to the output of an/a …………. gate.
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Concepts Used:
Microbes in Human Welfare
There are several valuable microorganisms that are beneficial to humans in various manners such as:
In Household Products
- Fermentation of milk to produce yogurt.
- Milk cuddling to compose curd, cheese, and paneer.
In Industrial Products
- Production of beverages such as wine, beer, whiskey, brandy, or rum.
- Production of antibiotics such as Penicillin and other chemical substances to kill or retard the expansion of disease-causing microbes.
Fermented Beverages
- A fermentor is used to produce microbes on a large scale for industrial purposes.
- The brewer’s yeast (Saccharomyces cerevisiae) is used to make ethanol. At this time, the yeast ferments malted cereals and fruit juices.
Antibiotics
- The term antibiotic means “against life”. These materials can kill or destroy the growth of other microbes.