The process of mineralization by microorganisms helps in the release of:
Show Hint
- inorganic nutrients from humus.
- both organic and inorganic nutrients from detritus.
- organic nutrients from humus.
- inorganic nutrients from detritus and formation of humus.
The Correct Option is A
Solution and Explanation
Step 2: This releases inorganic nutrients such as nitrogen, phosphorus, and potassium.
Step 3: These nutrients are made available to plants through this process.
Top Questions on Ecosystem
- (A) Analyse the following ecosystems and discuss, which will be more productive in terms of primary productivity:
A young forest, a natural old forest, a shallow polluted lake. - Differentiate between Net primary productivity and Gross primary productivity in an ecosystem.
- Why are restrictions imposed on MTP in India? Up to how many weeks or trimesters, is MTP considered relatively safe for a female, if necessary to perform, by a medical practitioner?
Read the passage given below and answer the question.
Food chains ‘P’ and ‘Q’ form an interconnection. ‘P’ initiates with wheat grass whose population supports a few grasshoppers, frogs and snakes.
‘Q’ starts with dead decaying leaves of wheat grass which are eaten by earthworms and then food chain is continued with frog of food chain ‘P’.
Identify the types of food chains ‘P’ and ‘Q’:
Study the table given below showing the relationship between organism, its trophic level and kind of food chain it belongs to.
Questions Asked in CBSE CLASS XII exam
A carpenter needs to make a wooden cuboidal box, closed from all sides, which has a square base and fixed volume. Since he is short of the paint required to paint the box on completion, he wants the surface area to be minimum.
On the basis of the above information, answer the following questions :
Find \( \frac{dS}{dx} \).- CBSE CLASS XII - 2025
- Differentiation
- Zaina, Yash and Kiran were partners in a firm sharing profits and losses in the ratio of 2 : 2 : 1. Zaina died on 1st July, 2024. As per the partnership deed, Zaina’s share of profit or loss till the date of her death was to be calculated on the basis of sales. Sales for the year ended 31st March, 2024 amounted to ₹ 4,00,000 and that from 1st April to 30th June, 2024 was ₹ 1,50,000. The profit for the year ending 31st March, 2024 was ₹ 1,00,000. Calculate Zaina’s share of profit in the firm till the date of her death and pass necessary journal entry for the same.
- CBSE CLASS XII - 2025
- Retirement and Death of a Partner
- Alok, Sameer and Tushar were partners in a firm sharing profits and losses in the ratio of 4 : 3 : 2. With effect from 1st April, 2024, they decided to share future profits and losses in the ratio of 3 : 2 : 4. Their Balance Sheet as at 31st March, 2024 showed the following: (i) Advertisement Suspense Account \u20b9 90,000.
(ii) Credit Balance of \u20b9 2,70,000 in Profit and Loss Account.
Goodwill of the firm was valued at \u20b9 4,50,000 and revaluation of assets and liabilities resulted in a loss of \u20b9 1,80,000. Partners did not want to distribute the amount of Advertisement Suspense Account and the Profit and Loss Account. They also decided that revalued values of assets and liabilities were not to be recorded in the books. Pass a single adjustment entry to give effect to the above. Also show your workings clearly.- CBSE CLASS XII - 2025
- Admission of a Partner
मालवा में ऋतु परिवर्तन के प्रभाव स्वरूप पहले कौन-से बदलाव होते थे ? वर्तमान में उसमें क्या अंतर आया है ? इस अंतर के कारणों की पड़ताल कीजिए ।
- CBSE CLASS XII - 2025
- हिंदी साहित्य
ग्रामीण परिवेश में जन्मे, पले-बढ़े व्यक्ति का आगे का जीवन भले ही शहर में बीते पर उसकी स्मृतियों का गाँव सदैव मोहक और आकर्षक बना रहता है । – ‘बिस्कोहर की माटी’ पाठ के आधार पर सोदाहरण लिखिए ।
- CBSE CLASS XII - 2025
- हिंदी साहित्य