Read and download free pdf of CBSE Class 12 Biology Biodiversity And Conservation Worksheet Set A. Students and teachers of Class 12 Biology can get free printable Worksheets for Class 12 Biology in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 12 students should practice questions and answers given here for Biology in Grade 12 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 12 Biology Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests
CBSE Class 12 Biology Biodivesity and Conservation (1). CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
Ques. Consider the following statements (A – D) each with one or two blanks.
(A) Bears go into (1) during winter to (2) cold weather.
(B) A conical age pyramid with a broad base represents (3) human population.
(C) A wasp pollinating a fig flower is an example of (4) .
(D) An area with high levels of species richness is known as (5) .
Which one of the following options, gives the correct fill ups for the respective blank numbers from (1) to (5) in the statements ?
(a) (3) – stable (4) – commensalism, (5)-marsh
(b) (1) – aestivation, (2) – escape, (3) – stable, (4) – mutualism
(c) (3) – expanding, (4) – commensalism, (5) – biodiversity park
(d) (1) – hibernation, (2) – escape, (3) – expanding (5) – hotspot
Ques. Which one of the following is an example of ex-situ conservation?
(a) Wildlife sanctuary (b) Seed bank
(c) Sacred groves (d) National park
Ques. Tiger is not a resident in which one of the following national parks?
(a) Sunderbans (b) Gir
(c) Jim Corbett (d) Ranthambhor
Ques. Which one of the following is not observed in biodiversity hotspots?
(a) Lesser inter-specific competition
(b) Species richness
(d) Accelerated species loss
Ques. World Summit on Sustainable Development (2002) was held in
(a) Argentina (b) South Africa
(c) Brazil (d) Sweden.
Ques. Identify the odd combination of the habitat and the particular animal concerned.
(a) Sunderbans – Bengal Tiger
(b) Periyar – Elephant
(c) Rann of Kutch – Wild Ass
(d) Dachigam – Snow Leopard National Park
Ques. Which of the following is considered a hotspot of biodiversity in India?
(a) Aravalli hills (b) Western ghats
(c) Indo-gangetic plain (d) Eastern ghats
Ques. Which one of the following is not included under in situ conservation?
(a) National park (b) Sanctuary
(c) Botanical garden (d) Biosphere reserve
Ques. Which one of the following is the correctly matched pair of an endangered animal and a national park?
(a) Great Indian bustard : Keoladeo National Park
(b) Lion : Corbett National Park
(c) Rhinoceros : Kaziranga National Park
(d) Wild ass : Dudhwa National Park
Ques. Biodiversity Act of India was passed by the Parliament in the year
(a) 1992 (b) 1996
(c) 2000 (d) 2002.
Ques. In your opinion, which is the most effective way to conserve the plant diversity of an area?
(a) By tissue culture method
(b) By creating biosphere reserve
(c) By creating botanical garden
(d) By developing seed bank
Ques. Viable material of endangered species can be preserved by
(a) gene bank (b) gene library
(c) herbarium (d) gene pool.
Ques. MAB stands for
(a) mammals and biosphere
(b) mammals and biology programme
(c) man and biology programme
(d) man and biosphere programme.
Ques. Identify the correct match between tiger reserve and its state.
(a) Manas - Assam
(b) Corbett - Madhya Pradesh
(c) Bandipur - Tamil Nadu
(d) Palamu - Odisha
Ques. Which of the following is the matching pair of a sanctuary and its main protected wild animal?
(a) Kaziranga-Musk deer
(d) All of these
Diversity at all levels of biological organisation Questions and Answers
Ques.A study of latitudinal gradient of biodiversity of birds is as follows:
India- 8 o North—1200 Species
Greenland-71 o North-55 Species
By analyzing the above data what does it indicate about the distribution of birds.
Ans. Species diversity decreases from equator towards the poles.
Ques.What favours the genetic variation shown by the medicinal plant Rauwolfia vomitoria growing in different Himalayan ranges ?
Ans. Genetic variation shown due to the potency and concentration of active chemical (reserpine) produced by the plant.
Ques.Why is Ecological diversity seen more in India as compared to Scandinavian country Norway.
Ans. As India is rich in various ecosystem level with deserts ,rain forest,mangroves,coral reef,wetlands,estuaries and alpine meadows so greater ecosystem diversity.
Ques. Match the following:
1.IUCN(2004) total number of plant animal species discovered so far ----7 million
2.Robert May estimate of global species diversity-----.5 million
3.70 % of all recorded are-----.1 %
4. Among animals the most rich species are----plants (algae, fungi, bryophytes, gymnosperm and angiosperms).
5.India has only 2.4 % of land area, its share of global species diversity is---- insects
Ans. Match the following:
1. IUCN (2004) total number of plant animal species described so far---- 1.5million
2. Robert May estimate of global species diversity----- 7 million
3. 70 % of all recorded are- ----plants(algae,fungi,bryophytes,gymnospers and angiosperms)
4. Among animals the most rich species are—---- insects
5. India has only 2.4 % of land area, its share of global species diversity is---- 8.1 %
Ques.Why are biologist not able to give the estimate of Prokaryotes in nature ?
Ans. Because the the conventional taxonomic methods are not suitable for identifying microbial species
Pattern of Biodiversity Questions and Answers
Ques. Answer in one word or one sentence
a) Why species diversity is more in India than in Greenland?
b) The scientist has found that the slope of line of regression is found to be more than 0.2. In which condition this will be possible?
Ans. Biodiversity decreases from equator to pole; When large areas like whole continent are taken for analysis.
Ques. Fill in the blank
a) The shape of graph in species area richness relationship in bats is -------------------.
b) Niche specialization thereby leading to greater species diversity in tropic is due to------------.
c) Frequent glaciations in temperate region leads to less-------------.
d) Species richness is related with-------------- up to a certain limit.
Ans. Rectangular hyperbola; More constant and predictable environment; Species diversification; area
Ques. Match the followings
1. Environment in temperate region. a) Steeper slope of line
2. More solar energy. b) More constant and more predictable.
3. Tropical latitudes c) Leads to more species diversity.
4. Constant environment d) More species diversification.
5. High regression coefficient e) More biodiversity.
Ans. 1-b; 2-c; 3-e; 4-d; 5- a
Ques. Choose the correct answer
a)The slope of line in species area relationship graph is 1.15
a) Angiosperm plants b) mammals c) birds d) fresh water fishes
b) Scientists have estimated that about two million insects species are yet to be discovered in
a) Greenland b) Equador c) Amazonian Rain forest d) India
c) As we move from 41oN to 71oN, the species diversity
a) Increases b) Decreases c) Remain the same d) Doubled
d) Frequent glaciations leads to
a) Increase species diversification b) High productivity c) Decrease species diversification d) Niche specialization
Ans. b; c ; b; c
Ques. The following graph depicts the species-area relationship. Answer the following questions
1) Give the equation of “A” and equation of ‘B”.
2) What does steeper slope in curve “B” represents?
3) Who studied the species – area relationship in South African jungles?
4) What does Z stands for? In which range does the normal value of Z lies?
Ans. S= CAZ ; log S= log C + Z log A ; Higher regression coefficient; regression coefficient, 0.1 to 0.2
Domestic sewage and industrial effluents Questions and Answers
Ques. Write scientific name of water hyacinth? why it is known as “terror of Bengal”?
Ans. Eichhornia crassipes. It results in eutrophication
Ques. Introduction of which nutrient in water bodies result eutrophication?
Ans. Nitrogen and phosphorus
Ques. Give reasons why there is a continuous increase in the DDT content in different trophic levels of the chain?
Ans. This happens because a toxic substance accumulated by an organism cannot be metabolized or excreted,and is thus passed on to the next higher trophical level.
Ques. What percentage of global warming is contributed by each of the following?
i)Carbon di oxide
iii)nitrous oxide and
Ans. i)60%, ii) 14%, iii)6%, iv) 20%
Ques. Ornithologists observed a decline in the bird population I the area near a lake after the setting of an industrial unit in the same area. explain the cause responsible for the decline observed?
Ans. High concentration of DDT interferes with calcium metabolism in birds and cause thinning of egg shells and their premature breaking,this eventually leads to a decline in bird population.
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