CBSE Class 12 Biology Organisms And Populations Study Guide

Download CBSE Class 12 Biology Organisms And Populations Study Guide in PDF format. All Revision notes for Class 12 Biology have been designed as per the latest syllabus and updated chapters given in your textbook for Biology in Standard 12. Our teachers have designed these concept notes for the benefit of Grade 12 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 12 Biology for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 12 Biology given our website

Organisms And Populations Study Guide Class 12 Biology Revision Notes

Class 12 Biology students should refer to the following concepts and notes for Organisms And Populations Study Guide in standard 12. These exam notes for Grade 12 Biology will be very useful for upcoming class tests and examinations and help you to score good marks

Organisms And Populations Study Guide Notes Class 12 Biology

Questions for Self Evaluation

1. A four years old girl suffered from ADA deficiency. She was cured by inserting a correct gene into her.a) what is this process called? b) In which cells are the genes introduced ?

2. What is the other name of mobile genetic elements?

3. Differentiate between insulin and pro insulin?

4. Explain down stream processes?

5. Differentiate exonuclease and endonuclease.

6. Expand the term PCR.

7. What is its importance in genetic engineering?

class_12-biology_concept_238


AMENSALISM :- Interaction in which one species is harmed whereas the other one is unaffected.

CARRYING CAPACITY :- Maximum size of population that can be sustained by the Environment

COMMENSALISM :- Interaction in which one species gets benefits and other is neither harmed nor benefited.

CONFORMERS :- Majority of animals and nearly all plants which cannot maintain constant internal environment.

EURYTHERMAL :- the organisms that can tolerate and thrive in a wider range of temperature.

EXPONENTIAL GROWTH :- Unimpeded growth of a population in an environment with abundant resources.

LOGISTIC GROWTH :- Growth of a population in an environment with limited resources (initial lag phase, phase of acceleration and finally stationary phase).

MORTALITY :- The number of deaths in a population during a given period.

NATAILITY :- The number of births in a population during a given period.

POPULATION DENSITY :-The number of individuals of a species present in per unit area at given time.

REGULATORS :- The organisms which maintain homeostasis (constant body temperature and osmotic concentration) by physiological means.

STENOTHERMAL :- The organisms that area restricted to narrow range of temperature.


ASSIGNMENTS


LEVEL 1


1 Why is thermoregulation more effectively achieved in larger animals than smaller ones?

2 What are osmoconformers?

3.What are the 2 forms of population growth?

4.What type of interaction is shown by sparrow eating the seeds?

5.How are eurythermal animals differ from stenothermal?

6.Name the four levels of organization that are studied in ecology.

7.Give any one example of brood parasitism.

8.Write an expression, which gives the change in population size after a given time.


LEVEL2

1.Mention the adaptations the mammals of colder areas have.

2.When does a population growth curve assume J-shape?

3.What is Gause‘s Compitition Exclusion Principle? Give 1 example.

4. How is cactus adapted to survive?

5. Lichen and mycorrhiza are very important examples of mutualism.

(i) Define mutualism.

(ii) Write the names of components of both.

(iii) What is the benefit of mutualism to both of them.

6. What type of morphological and physiological defences have been evolved by plants.


LEVEL3


1. Mr. Ram on a trip to Rohtang Pass Suddenly experienced heart Palpitations, Nausea, fatigue etc

on reaching the destination. Suggest the reasons for his sudden deterioration of health and also state whether his body will withstand this problem if he stays there for long and how? 

2. Observe the following equation :

CBSE Class 12 Biology - Organisms and Populations Study Guide

 

i) Name the population growth curve.
ii)What does N, r and K represent?
iii).What type of growth status the following pyramid represents.

CBSE Class 12 Biology - Organisms and Populations Study Guide

 

3. .Anand on a visit through an under the ocean aquarium found that many sea anemones are attached to hermit crab shells, sucker fisher attached to the ventral surface of sharks and clown fish living among the sea anemones. He wondered whether all these associations are of the same type; can you help him to arrive at the correct conclusion.

4. Abingdon tortoise in Galapagos Island became extinct with in a decade after goats were introduced on the island. Why? What could be principle behind this situation?

5. An orchid plant is growing on the branch of a mango tree. How do we describe this interaction b/w orchid and mango tree?

6. Observe this diagram and answer the following question

CBSE Class 12 Biology - Organisms and Populations Study Guide

 

a. What is the terminology for B& E.?
b. If B + I is more then D + E then what will happen to population density.

(c) What are the most important factors which influence a population density of an area under normal condition ?
(d) If a habitat is being colonised recently then which factor contribute more to the population growth


QUESTIONS FOR SELF EVALUATION

1. An orchid plant is growing on the branch of a mango tree. How do we describe this interaction between orchid and mango tree?

2. The population of tigers in a forest becomes zero, due to uncontrolled hunting. What would be the long term effects of this situation in the forest?

3. Identify the biome distribution with respect to annual temperature and Precipitation from the following graph. Answer A, B, C & D.

CBSE Class 12 Biology - Organisms and Populations Study Guide


4. The following graph represents the organismic0 response to certain environmental condition.

(i) which one of these, A , B , C depicts conformers?
(ii) How do A , B differ from each other with reference to homeostasis?
(iii) What does C of graph depict?
(iv) Mention the category to which man belongs.

 CBSE Class 12 Biology - Organisms and Populations Study Guide


(i) Men Study the given age profiles related to human population and answer the following questions
(ii) tion the names given to A , B , C kinds of age profiles.
(iii) Which one of these is ideal for a population?(iv) How do such age profile studies help policy makers prepare for future planning?

 CBSE Class 12 Biology - Organisms and Populations Study Guide

5. Why small animals are rarely found in polar region?

6. How does the special photosynthetic pathway like CAM support desert plants? 

7. Why do animals migrate from one region to the other region in the cold season?

8. What type of population interaction in A, B, C, D between the species A and B as per the tabular column given below.
(i) Men Study the given age profiles related to human population and answer the following questions.
(ii) tion the names given to A , B , C kinds of age profiles.
(iii) Which one of these is ideal for a population?
(iv) How do such age profile studies help policy makers prepare for future planning?

CBSE Class 12 Biology - Organisms and Populations Study Guide



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Chapter 1 Reproduction in Organisms
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Chapter 2 Sexual Reproduction In Flowering Plants
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CBSE Class 12 Biology Sexual Reproduction In flowering Plants Notes Set B
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Chapter 3 Human Reproduction
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Chapter 4 Reproductive Health
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CBSE Class 12 Biology Reproductive Health Notes Set B
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Chapter 5 Principles of Inheritance and Variation
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Chapter 6 Molecular Basis of Inheritance
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CBSE Class 12 Biology Molecular Basis Of Inheritance Notes Set A
CBSE Class 12 Biology Molecular Basis Of Inheritance Notes Set B
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Chapter 7 Evolution
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CBSE Class 12 Biology Evolution Notes Set A
CBSE Class 12 Biology Evolution Notes Set B
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Chapter 8 Human Health and Diseases
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CBSE Class 12 Biology Human Health And Disease Notes Set A
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Chapter 9 Strategies for Enhancement In Food Production
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CBSE Class 12 Biology Strategies For Enhancement In Food Production Notes Set B
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Chapter 10 Microbes In Human Welfare
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CBSE Class 12 Biology Microbes In Human Welfare Notes Set A
CBSE Class 12 Biology Microbes In Human Welfare Notes Set B
Chapter 11 Biotechnology Principles and Processes
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CBSE Class 12 Biology Biotechnology Principles And Processes Notes Set B
CBSE Class 12 Biology Biotechnology Principles And Processes Study Guide
Chapter 12 Biotechnology and Its Application
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Chapter 13 Organisms and Populations
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CBSE Class 12 Biology Organisms And Populations Notes
CBSE Class 12 Biology Organisms And Populations Study Guide
Chapter 14 Ecosystem
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CBSE Class 12 Biology Ecosystem Notes Set A
CBSE Class 12 Biology Ecosystem Notes Set B
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Chapter 15 Biodiversity and Conservation
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Chapter 16 Environmental Issues
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Concepts Maps
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Other Chapters
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