Madhyamik Life Science Question Paper 2020

    

 Madhyamik Life Science Question Paper 2020

 

Madhyamik, the Class 10 School leaving examination, is conducted by the West Bengal Board of Secondary Education (WBBSE). The examination is held in the month of February 2020. Each paper started on each day from 11.45 A.M to 3.00 P.M

 

Students can download the syllabus and the model question papers from the official website of West Bengal Board of Secondary Education. Here is the link is provided http://www.wbbse.org/.

Having the knowledge of previous years question papers of Madhyamik Pariksha is essential for achieving the best performance. At the Vision Success (website), you can view or even can downloaded in PDF form, the previous year question papers. This post provides you the Madhyamik Life Science Question Paper

Madhyamik Question Papers Year wise
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Madhyamik Question Paper PDF	Urdu Version	English Version
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Madhyamik Question Paper 2020 Solved
Life Science 2020
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Solved Part B	Download

Vision Success 

West Bengal Board Secondary Education

2020

Life Science

(Time: 3 Hours 15 Minutes)

Full Marks: 90

(New syllabus)

GROUP-A

(Answer to all questions is compulsory)

Write the answer in complete sentence by choosing the correct answer for each question with respective serial number :                                                 1x15=15

1.1 Select the correct pair –

(a) Cerebrum - Maintenance of balance of the body

(b) Hypothalamus - Control of intelligence and emotion

(c) Cerebellum - Control of body temperature

(d) Medulla Oblongata - Control of heart beat and swallowing of food

1.2 Identify which of the following statements is not true regarding Insulin -

(a) Helps in the absorption of glucose from blood into most of the somatic cells

(b) Converts glucose into glycogen within liver and muscle cells

(c) Helps in the conversion of fat and protein into glucose

(d) Inhibits the conversion of protein and fat into glucose

1.3 Match the words of Column-A with that of Column B and select which of the following options is correct -

                    Column-A                                             Column-B

                A. Flexion                                             (i) Quadriceps

                B. Extension                                         (ii) Piriformis

                C. Rotation                                             (iii) Biceps

(a) A-(i)      B-(ii)     C-(iii)

(b) A -(ii)     B-(iii)     C-(i)

(c) A -(iii)     B-(i)     C-(ii)

(d) A -(ii)     B-(i)     C-(iii)

1.4 Determine from the answers given below in which phases of karyokinesis during mitotic cell division following two incidents happen

(A) Daughter chromosomes tend to move apart from each other towards their own poles

(B) Nuclear membrane and nucleolus disappear

(a) (A) Prophase (B) Anaphase

(b) (A) Anaphase (B) Prophase

(c) (A) Telophase (B) Metaphase

(d) (A) Metaphase (B) Telophase

1.5 Select which of the following is the feature of cross pollination -

(a) Occurs within the same flower of the same plant

(b) Agents are not required Lesser chance of new characters being transmitted

(d) More wastage of pollen grains

1.6 Determine the number of DNA molecules that get coiled to form each chromosome in a newly formed daughter cell produced by mitotic cell division in human body -

(a) 46

(b) 1

(c) 23

(d) Numerous

1.7. Identify the genotype of guinea-pig having black colour and rough hair –

(a) BbRr, BBRO

(b) BBrr, Bbrr

(c) bbRR, bbRr

(d) bbrr, bbRr

1.8 Decide which of the following two were selected by Mendel as recessive traits - (a) Colour of flower – purple, position of flower - axial

(b) Length of stem - dwarf, form of ripe seed - wrinkled

(c) Form of ripe seed - round, colour of seed - yellow

(d) Position of flower - axial, length of stem - tall

1.9 Assess from the following, the probable genotype of parents having hemophilic son and normal daughter

(a) H||h, his

(b) H||H, HIN

(c) H||H, hl

(d) Hllh, HIT

1.10 Parthenium is an exotic species in our country. Other indigenous species cannot survive in such places where it grows. This establishes one of the postulates of Darwin's theory. Identify the postulate ---

(a) Intraspecific struggle

(b) Interspecific struggle

(c) Struggle with environment

(d) Origin of new species

1.11 Miller and Urey, in their experiment, were able to synthesize some preliminary constituents necessary for the creation of life. Identify the ones which were amino acids among them -

(a) Lactic acid, Acetic acid

(b) Urea, Adenine

(c) Glycine, Alanine

(d) Formic acid, Acetic acid

1.12 Decide for which of the following purpose bees demonstrate waggle dance -

(a) Search for reproductive mates

(b) Inform other worker bees about the direction and the distance of the source of food from the bee hive

(c) Selecting place for the construction of the new bee hive

(d) Avoid attack by probable enemy

1.13 Identify which of the following is the correct information related to biosphere reserve -

(a) Conservation is promoted to local people and other biotic communities along with conservation of ecosystem

(b) National Park and Sanctuary are not included within biosphere reserve

(c) The presence and participation of local people for the conservation of ecosystem are not permissible

(d) It's size is usually smaller than a Sanctuary

1.14 Decide which of the following pair is not correct

(a) Poaching - Increase the endangered-ness of gorilla

(b) Exotic species – Lantana, Tilapia

(C) Determination of hotspot - Number of endemic species and endangered species

(d) Greenhouse gas – Eutrophication

1.15 Decide which of the following Project Tiger is located within our state –

(a) Bandipur

(b) Simlipal

(c) Sunderbans

(d) Kanha

GROUP-B

2. Answer any 21 questions out of 26 questions given below as instructed: 1x21=21

Fill in the blanks with proper words in the following sentences (any five) : 1x5=5

2.1 Acharya Jagadish Chandra Bose proved the

property of __ _____ by sending electrical impulse in Mimosa and Desmodium plant.

2.2 If gametes in human were produced by mitosis instead of meiosis then the number of autosomes in a somatic cell of an offspring would have been ________

2.3 A disease in human population caused by recessive gene located in 'X' Chromosome is ______.

2.4 The hoof of modern horse is the transformation of the digit number_____ of their ancestors.

2.5 At the _____ phase of nitrogen cycle ammonia is converted into nitrite and nitrate by the action of some bacteria.

2.6 To produce the bottled cold drinks widely sold in the market, a lot of water is wasted.

Decide whether the following statements are true or false (any five) : 1x5=5

2.7 Tropic movement is the movement of growth in plants.

2.8 Crossing over takes place during mitotic cell division.

2.9 Mendel used the term gene while describing his experiments related with heredity.

2.10 The leaf of Cactus is modified into spine for the reduction of the rate of transpiration.

2.11 Rhododendron is an endangered plant species conserved in Eastern Himalaya hotspot.

2.12 Choroid helps in the accommodation of eye by changing the curvature and shape of the lens. Match the words in Column-A with those which are most appropriate in Column-Band re-write the correct pair mentioning the serial no. of both columns (any five) :                                                         1x5=5

                        Column-A                                         Column-B

                2.13 Gibberellin                                     (a) rrYYS

                2.14 Cutting                                           (b) Recharging of ground water

                2.15 Genotype of pea                            (c) Pyrimidine base

                plant having wrinkled and yellow

                coloured seed

                2.16 Homologous organ                         (d) Causes the breakdown Icons

                                                                                    of dormancy of bud and seed.

                                                                               (e) Structure is same but function                                                                                         is different

                2.18 Thymine and Uracil                         (f) RRYy17

                                                                                (g) Rose 17

Answer in a single word or in a single sentence (any six) :                     1x6=6

2.19 Choose the odd one and write it :

                                Cerebrum, Hypothalamus, Pons, Thalamus

2.20 Where the Schwann cells are located?

2.21 A pair of related terms is given below. On the basis of the relationship in the first pair write the suitable : * word in the gap of second pair.

                                   Mitosis : Radicle :: Meiosis

202. Which law Mendel concluded from his dihybrid cross experiment ?

2.23 Give an example of a variation found among healthy persons which is transmitted through generations.

2.24 How Chimpanzees break open the hard shells for eating the nuts?

2.25 Among the following four terms, one includes the other three. Find it out and write it : SPM, Air Pollution, Greenhouse gas, Lung disease

2.26 Name the practice which jointly the local peoples and forest department maintain for reclamation of forest.

GROUP-C

Answer any 12 questions in 2-3 sentences out of 17 questions given below:                                                                                                                         2x12=24

3.1 Distinguish between the functions of hormone and nervous system on the following parameters :

• Nature of function
• Pace of function
• time span of function
• Fate

3.2 'A' person can see distant objects distinctly but is unable to visualize near object in a perfect way'- Predict what would be the probable cause and suggest the corrective measure for such problem.

3.3 Analyse the role of synthetic plant hormone in increasing the production and solving the problem of weed in agriculture.

3.4 'LH and ICSH control the secretion of hormones of reproductive glands of human body - judge the validity of the statement.

3.5 how can you distinguish between mitosis of plant cell and that of animal cells on the basis of Formation of spindle fiber and the process of cytokinesis?.

3.6 Establish the relationship between the formation of malignant tumour in human body with the loss of control in the cell cycle.

3.7 'The adventitious leaf bud plays significant role in natural vegetable. Evaluate the validity of the statement with a proper example.

3.8 show with the help o cross, who is more important among parents in determining the sex of their offspring.

3.9 different genotypes produce the same phenotype _____

justify the statement in the form a table by taking an example from the result of dihybrid cross of Pea Plant.

3.10 Give your opinion about probable suggestions which can be given to a pair of contenders before marriage in order to prevent the spread of a genetic disease from the society already known to you.

3.11 a good number of Tilapia fishes are released in a pond having only different indigenous fish species grown naturally. think and write which types of struggle for existence Tilapia fishes have to face in order to survice.

3.12 Prepare a list of roles air sacs of pigeon play to fly in the air.

3.13 Structure and function.

         Indicating the nature of evolution

Based on the above two features establish the concept of analogous organ with the help of proper example.

3.14 Relate the following phenomena with the trend of disturbance in Nitrogen Cycle resulting from different human activities.

• Global warming
• Acidification of soil and water of river and lake.

3.15 Hilsa, Bee, Penguin, Rauwolfia_

Assess which are the cases of endangered-ness of the above mentioned organisms.

3.16 Discuss any two roles f People's Biodiversity Register (PBR) in conserving local biodiversity.

3.17 Tabulate any of the four activities which are prohibited in a sanctuary following the provisions of Wild life Act.

GROUP-D

Answer 6 questions or their alternatives given below. Sightless candidates have to answer question No. 4.1(A) instead of 4.1 :--                         5x6=30

4.1 Draw a neat diagram of the vertical section of the eyeball of human eye and label the following parts :                                                                         3+2=5

(a) Choroid         (b) Optic nerve

(c) Iris                 (d) Yellow spot

Or,

Draw a neat diagram of the metaphase of mitotic cell division in an animal cell and label the following parts :                                                                         3+2=5

(a) Chrornatid                         (b) Centromere

(C) Polar region                     (d) Spindle fibre

(FOR SIGHTLESS CANDIDATES ONLY)

4.1(A) Write one function for each of the following parts of the human eyeball:                                                                                                                         1x5=5

(a) Vitreous humor

(b) Sclera

(c) Iris

(d) Lens

(e) Retina

Or,

Write three features of the metaphase stage and two features of the anaphase stage of mitotic cell division in animal cell.

4.2 Distinguish between Mitotic and meiotic cell division in animals on the basis of following feature.

• Site of occurrence
• Nature of division of Chromosome.
• Number of cells produced.

Or,

Explain the functions of following parts of an eukaryotic chromosome:

• Centromere
• Telomere

Analyse the role of cell divisions in controlling growth, reproduction and repair in an organism.

4.3 Tabulate three pairs of dominant-recessive traits of pea plant as selected by Mendel. State the first law of Mendel as deducted from the experiment of Monohybrid cross.

OR

A colour blind female married a normal male. judge the probability o colour blindness among their children in the first filial generation. Show with the help of a cross how the first law of Mendel is deviated in the case of Four-O Clock plant in F2 generation.

4.4 With the help of arrow signs, show the major evolutionary events as occurred gradually after the origin of life.

OR

Discuss the following three events as mentioned in the evolutionary theory of Darwin :

• Prodigality of production
• Origin of variation
• Natural selection ‘

Adaptation is the change of shape, physiological functions and behaviour of organism'--Justify the statement with the help of any two examples.            3+2=5

4.5 Evaluate the effects of following pollutants on environment and human health:

• Non-biodegradable insecticides
• Pollen grain
• Chemical fertilizers containing phosphate and nitrate
• Wastes containing pathogens originated from health centres
• Chlorofluorocarbon

OR

Speculate the probable causes of each of the following phenomena ::

• Insomnia, High blood pressure, Partial or Complete deafness
• Decrease in the concentration of dissolved . oxygen in water and floating of dead fishes.
• Decrease in the number of Crocodiles.
• Inflammation in the respiratory tract of lung
• Decrease in the number of pollinating insects

4.6 “The ever-increasing population in the different cities of India is creating the crisis of groundwater' - Support the statement with reasons on the basis of your experiences. Construct a concept map to show how the increase in human habitat is influencing the ecosystem of Sunderbans. 3+2=5

OR

summarize which conservation measures have been adopted to increase the population of an endangered mammal exclusively found in the swampy grass lands under the foothills of the Easten Himalaya. Discuss the role of biodiversity in maintaining the balance of the ecosystem of a river.                             3+2=5

GROUP_E

(FOR EXTERNAL CANDIDATES ONLY)

5. Answer any 4 questions :                                                         1x4=4

5.1 Write one feature of epithelial tissue.

5.2 Which cell organelle is termed as “Suicidal Bag' ?

5.3. Write one function of parenchyma tissue.

5.4 Give an example of an entomophilous flower.

5.5 Give example of a proteolysis enzyme."

Madhyamik Question Paper 2020
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