Madhyamik Life Science Question paper 2017

Madhyamik, the Class 10 School leaving examination, is conducted by the West Bengal Board of Secondary Education (W.B.B.S.E.) every year. The examination is held in the month of February 2017. Each paper started on each day from 11.45 A.M to 3.00 P.M

Here is provided Madhyamik Life Science Question paper 2017. Full Marks is 90 for Regular candidates and 100 for the External Candidates. Time duration is Three Hours Fifteen Minutes.

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2017

Life Science

(For Regular & External Candidates)

Time; Three Hours Fifteen Minutes

(First fifteen minutes for reading the question paper)

	90 – For Regular Candidates
	100 – For External Candidates

Special credit will be given for answers which are brief and to the point. Marks will be deducted for spelling mistakes, untidiness & bad handwriting.

Only External candidates’ will answer Group E.

Figures in the margin indicate full marks for each question.

Group “A”

1. Multiple choice questions. Four alternatives are given as answer for each of the following questions. Write the correct ones. 1x15= 15

1.1 Some flowers open after sunrises and close after sunset. This is-

(a) Photosynthesis (b) Seismonasty (c) Chemonasty (d) Thermonasty

1.2 The part of human brain associated with controlling body temperature

(a) Thalamus (b) Cerebellum (c) Hypothalamus (d)Medulla oblangata

1.3 A person affected with Diabetes Mellitus is unable to secrete which of the following hormone

in adequate quantity?

(a) Adrenaline (b) Insulin (c) Thyroxin (d) Testosterone

1.4 You have observed the separation of two sister chromatide at one stage of mitotic cell division.

The stage is-

(a) Prophase (b) Telophase (c) Anaphase (d) Metaphase

1.5 Which of the following pair is correct-

(a) Budding-Yeast (b) Fragmentation-Earthworm

1.6 Which phase the human development is associated with the maturity of reproductive organs

and reproductive gland.

(a) childhood (b) Adolescence (c) Late Adulthood (d) Infancy

1.7 which of the following traits in pea plant is recessive-

(a) wrinkled seed (b) Yellow coloured seed

1.8 how many types of gametes are found from pea plant having genotype YyRr?

(a) 1 (b) 2 (c) 3 (d) 4

1.9 The probability of hemophilic girl children born to a hemophilia carrier mother and normal

father is-

(a) 75% (b) 50% (c) 100% (d) 0%

1.10 The gas which was absent in the environment during the origin of life is

(a) Hydrogen (b) Oxygen (c) Methane (d) Ammonia

1.11 The feature of analogous organs is -

(a) Different in origin but functions are also different.

(b) Different in origin but functions are same

(d) Identical in origin and struct ure

1.12 Which of the following absorbs the gas of swim bladder in bony gland?

(a) Red gland (b) Anterior chamber (c) Gastric gland (d) Retina mirabilis

1.13 Which of the following phase of nitrogen cycle pseudomonas is associated with?

(a) Nitrogen fixation (b) Nitrification

1.14 One endangered species of the Eastern Himalayas biodiversity hotspot is

(a) Lion tailed macaque (b) Organ Putan

1.15 The diseases associated with air pollution are

(a) Diarhorea, Typhoid, Hepatitis (b) Hepatitis, Bronchitis, Deafness

(c)Bronchitis, Asthama, Lung cancer (d) Lung Cancer, Polio, Malaria

Group-B

2.Answer the following questions. Alternative are to be noted. 1x21= 21

Fill in the blanks: 1x5=5

2.1 The process of necessary adjustment of focal length of the lens in human eye is called

_______

2.2 Adenine is a _______ type of nitrogenous base.

2.3 ______ is a disease created by sex linked gene.

2.4 The earnest ancestor in the evolution of horse is _______.

2.5 An inflammable Green House Gas produced from paddy field is _________.

2.6 _______ is biosphere reserved located in West Bengal.

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

2.7 Gibberellins hormone prevents immature shedding of leaf of plant.

2.8 Ovum is only produced as a result of mitosis

2.9 Self pollination or cross pollination can be exercised in flowers of pea plant according to the

need. 1

2.10 The fundamental tenet of the evolutionary theory of Darwin’s is the process of natural

selection. 1

2.11 Degradable pollutant is responsible for biomagnifications, 1

2.12 Flagella are the locomotory organ of paramecium. 1

Match the following right column with left column. 1x4=4

A		B
2.13	Blind spot	(a) Pollution of ground water
2.14	Cytokenesis	(b) The point of connection o retina and optic nerve.
2.15	44A+xy	(c) Homologous organ
2.16	Wings of bat and bird	(d) Formation of cell plate.
2.17	Arsenic	(e) Pollen grain
2.18	Transfer to stigma	(f) Sound pollution (g) Chromosomal arrangement of human male

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

2.19 Choose the odd one write it: TSH, ACTH, GTH, CSF

2.20 Write one function of Myelin sheath.

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..

2.22 Give an example of a variation inherited in man along the generation.

2.23 Which type of chromosome in human carries gene responsible for the disease thalassemia?

2.24 Mention one morphological adaption of cactus to prevent transpiration.

2.25 among the following four terms one includes the other three. Find out that term and write it

Embryo, Meristematic tissue, Seed, cryopreservation.

2.26 Write the name of the cause of the latest concern regarding the environment of

sunderbans. 1

Group C

3. Answer the following questions 2x12= 24

3.1 Write two differences between tropic movement and nastic movement.

3.2 Categorise the following actions as natural or inherited reflex action.

Willingness of infants for breast feeding, cycling, sneezing,

catching ball by wicket keeper with swiftness.

3.3 Write the parts of central nervous system and periphery nervous system.

3.4 Write two importance of cell cycle.

3.5 Distinguish between DNA and RNA based on the following features- pyrimidine base,

S.C.sugar

3.6 Which agent performs the function of pollination in the flowering plants?

Paddy, Hydrilla, Shimuli, Mango.

3.7 State with example how dominant trail is expressed in the experiment of hybridization.

3.8 What would be the ratio of phenotype and genotype of F2 generation in monohybrid

experiment in case of in complete dominant?

3.9 Show with the help of a cross, how colour blindness is inherited.

3.10 Write the name of reactants used and one organic compound formed in the experiment of

Miller and Urey in connection with chemical origin of life.

3.11 Write four important features modified in the evolution of horse.

3.12 How sundaria plant excretes the excess salt from its body?

3.13 Write names of two micro organisms participating in the process of biological nitrogen

fixation.

3.14 Mention two damages as a result of acid rain?

3.15 Give four examples of damages of biodiversity as a result of global warming.

3.16 Write the major topics regarding biodiversity register (PBR)

Group D

4. Answer the following questions (alternatives are to be noted)

4.1 Draw a neat diagram of the vertical section of the eye ball human eye and label the following

parts. (a) cornea (b) lens (c) Vitreous humor (d) Retina

Or,

Draw a metaphase of mitosis of plant cell or an animal cell division and label the following

parts. . (a) Chromosome (b) polar region (c) Spindle fiber (d) centromere.

4.2 Explain the inter relationship among chromosome DNA and gene. Distinguish between

euchromatin and heterochromatin on the following two aspects: Coiling,. Activity.

Or,

How micro propagation is done? State what happens in the following three phases of sexual reproduction of flowering plants. Production of gamatic or reproductive cell. Fertilization, formation of embryo and new plant.

4.3 With the help of a checker board show the types of offspring’s that might be produced in a

cross between a hybrid black guinea pig and a pure white guinea pig. State the law of

recreation as proposed by Mendel.

Or,

Mention the symptoms of thalassemia disease in many families mothers are labeled as responsible for the birth of daughter child. Demonstrate with the help of across that this belief is not justified.

4.4 Mention two features of internal structures on the basis of which flipper of whale and wings of

bird are considered as homologous organ. How a worker bee of a beehive communicates with

other worker bees regarding source and location of food.

Or,

Show the major evolutionary events with the help of a flow chart.

4.5 What are the causes of Asthma? What are the roles of joint Forest management in the

conservation of biodiversity?

Or,

Assess the causes of depletion of biodiversity with proper examples.

4.6 Propose two conservation measures that could be taken to increase the number of Indian one

horned rhino. Make your opinion based on your experiences how the sources of fresh water

become polluted? 2+3=5

Or,

Which condition do you consider to declear one area out of two as biodiversity hot spot?

Give two examples of ex-situ conservation.

Madhyamik Life Science Question paper 2017