CBSE Class 12 Biology Previous Year Question Paper 2011
This document contains questions from the CBSE Class 12 Biology Previous Year Question Paper of 2011, focusing on Nutrient Cycling & Ecosystem Services. It includes questions categorized by marks: 2-mark, 3-mark, and 5-mark questions. The questions cover topics such as the function of reservoirs in nutrient cycles, types of nutrient cycles (gaseous and sedimentary), the carbon cycle model, and the phosphorus cycle in terrestrial ecosystems. It also touches upon the importance of nutrient cycles and how large-scale activities might affect nutrient flow. Solving these previous year papers is crucial for students to understand the exam pattern, question types, and marking scheme, thereby enhancing their preparation and performance in the board examinations.
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Quick info
| Board | CBSE |
|---|---|
| Class | 12 |
| Subject | Biology |
| Session | 2011 |
| Language | English |
| Type | Previous Year Question Paper |
| Exam type | Board Exam |
Paper pattern
The paper includes 2-mark, 3-mark, and 5-mark questions, covering various aspects of nutrient cycling and ecosystem services.
Topics covered
Paper topics
- Nutrient Cycling
- Ecosystem Services
- Gaseous Cycles
- Sedimentary Cycles
- Carbon Cycle
- Phosphorus Cycle
Important topics
- Function of Reservoir
- Types of Nutrient Cycles
- Carbon Cycle Model
- Phosphorus Cycle Model
- Importance of Nutrient Cycles
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Question paper text
Nutrient Cycling & Ecosystem Services
2 Marks Questions
- Explain the function of reservoir in nutrient cycle. List the two types of nutrient cycles in nature. [Foreign 2011]
Ans. Reservoir in an ecosystem meets the deficit that arises due to the imbalance in the influx and efflux of nutrients. The two types of nutrient cycles are:
- Gaseous cycle (ii) Sedimentary cycle
2. Name the two types of nutrient cycles existing in nature. Where are their
reservoirs present? State the function of reservoirs. [All India 2010 c]
Ans. Two types of nutrient cycles in nature:
- (a) Gaseous cycles (carbon and nitrogen cycle).
- Sedimentary cycles (phosphorus and sulphur cycle).
- (a) Reservoir for gaseous cycle is atmosphere.
- Reservoir for sedimentary cycle is earth's crust.
Function of Reservoir It meets the deficit which occurs due to the imbalance in the state of influx and efflux of nutrients
3 Marks Questions
- State the function of a reservoir in a nutrient cycle. Explain the simplified model of carbon cycle in nature.
Ans. For function of a reservoir in a nutrient cycle.
Two types of nutrient cycles in nature:
- (a) Gaseous cycles (carbon and nitrogen cycle).
- Sedimentary cycles (phosphorus and sulphur cycle).
- (a) Reservoir for gaseous cycle is atmosphere.
- Reservoir for sedimentary cycle is earth's crust.
Function of Reservoir It meets the deficit which occurs due to the imbalance in the state of influx and efflux of nutrients
4.Draw and complete the following model of carbon cycle filling A, B,C,D,E and F.
400 <math>CO_2</math> atmosphere D Α В С
Ε Plants Animals F
Calcareous sediments
Ans. Carbon cycle in
400 CO<sub>2</sub> Combustion of atmosphere fossil fuels
Respiration
Photosynthesis Respiration
Aquatic Plants Animals Coal and food oil chain
Calcareous sediments
5 Marks Questions
5.(i) Draw a simplified model of phosphorus cycling in a terrestrial ecosystem.
- Write the importance of such cycles in ecosystems. [All India 2014 C]
Ans. (i) Simplified model of phosphorus cycling in a terrestrial ecosystem.
Consumers Producers
Litter fall Detritus Decomposition Uptake Soil solution Weathering Run off Rock minerals
- The importance of such nutrient cycles in ecosystem can be briefed as:
- It allows exchange, storage and transfer of biogenetic nutrients through various biotic components of ecosystem.
- It also allows exchange of nutrients between abiotic and biotic components of ecosystem.
- Recycling of nutrients allows them to be used repeatedly and indefinitely.
6.(i) (a) Name the given biogeochemical (nutrient)cycle.
- Name an activity of the living organisms not depicted in the cycle by which this nutrient is returned to the atmosphere.
- How would the flow of nutnent m the cycle be affected due to the large scale
Frequently asked questions
What is this document?
This is a CBSE Class 12 Biology Previous Year Question Paper from 2011, focusing on Nutrient Cycling & Ecosystem Services.
What topics are covered in this paper?
The paper covers topics like the function of reservoirs, types of nutrient cycles (gaseous and sedimentary), the carbon cycle, and the phosphorus cycle.
How does solving previous year papers help?
Solving previous year question papers helps students understand the board exam pattern, question difficulty, and marking scheme, improving their preparation and confidence.
What is the structure of the questions?
The questions are divided into sections based on marks, including 2-mark, 3-mark, and 5-mark questions, requiring explanations, diagrams, and cycle models.
Is this paper useful for exam preparation?
Yes, this 2011 CBSE Class 12 Biology board question paper is an essential resource for students aiming to practice and score well in their final examinations.
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