Madhyamik  Life Science Question paper 2017

2017

LIFE SCIENCE

(New Syllabus)

Time – Three Hours Fifteen Minutes

(First fifteen minutes for reading the question paper only)

Full Marks – 90

(For Regular and Sightless Regular Candidates)

Full Marks – 100

(For External and sightless External Candidates)

Special credits will be given for answers which are brief and to the point.

Marks will be deducted for spelling mistakes, untidiness and bad handwriting

Figures in the margin indicate full marks for each question

DIRECTIONS

For Regular candidates, the questions for Group ‘A’, ’B’, ‘C’, ‘D’ will have to be answered.

Special Instruction for Sightless Candidates

In Group ‘D’ instead of Question No. 4.1, 4.1 (A) will also have to be answered in addition to Group ‘A’, ‘B’, ‘C’ and D.

Instructions regarding the number of questions to be attempted have been

indicated at the beginning of each group.

Group A

(Answer to all questions is compulsory)

1. Write the answer in complete sentence by choosing the correct answer for each question with respective serial  number. [1 x 15 = 15]

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

(a) Photonasty

(b) Seismonasty

(c) Chemonasty

(d) Thermonasty

1.2  A person affected with Diabetes Mellitus is unable to secrete which of the following hormone in adequate quantity -

(a) Adrenaline

(b) Insulin

(c) Thyroxine

(d) Testosterone

1.3  The part of human brain associated with controlling body temperature is -

(a) Thalamus

(b) Cerebellum

(c) Hypothalamus

(d) Medulla Oblongata

1.4  You have observed  the separation of two sister chromatids at one stage of mitotic cell division. The stage is -

(a) Prophase

(b) TeIophase

(c) Anaphase

(d) Metaphase

1.5  Which of the following pair is correct -

(a) Budding – Yeast

(b) Fragmentation-Earthworm

(c) Spore formation Amoeba                              

(d) Regeneration – Dryopteris

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

(c) Purple coloured flower

(d) Axial flower

1.8  How many types of gametes are formed from pea plant having genotype YyRr?

(a) 1   (b) 4   (c) 2   (d) 3

1.9  The probability of haemophilic girl children born to a haemophilia 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 organ is -

(a) Different in origin and functions are also different

(b) Different in origin but functions are same

(c) Indicates divergent evolution

(d) Identical in origin and structure.

1.12 Which of the following absorbs the gas of swim bladder in bony Fishes -

(a) Red gland

(b) Anterior chamber

(c) Gastric gland

(d) Retia mirabilia

1.13 Which of the following phase of nitrogen cycle Pseudomonas is associated with -

(a) Nitrogen fixation

(b) Nitrification

(c) Denitrification

(d) Ammonitication

1.14 One endangered species of the Eastern Himalayas biodiversity hotspot is -

(a) Lion tailed macaque

(b) Orangutan

(c) Red Panda

(d) Nilgiri thar 

1.15 The diseases associated with air pollution are - 

(a) Diarrhoea, Typhoid, Hepatitis

(b) Hepatitis, Brohchitis, Deafness

(c) Bronchitis, Asthma, Lung Cancer 

(d)Lung Cancer, Polio, Malaria

Group B

2. Answer any 21 questions out of 26 questions given below as instructed.  [1 x 21 = 21]

Fill in the blanks with proper words in the following sentences (any five) : [1 x 4 = 4]

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 earliest ancestor in the evolution of horse is _______. 

2.5  An inflammable greenhouse gas produced from paddy field is _______.

2.6  ______ is a biosphere reserve-located in West Bengal. 

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

2.7  Gibberellin hormone prevents immature shedding of leaf of plants.

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.

2.10 The fundamental tenet of the evolutionary theory of Darwin is the process of natural selection.

2.11 Degradable pollutant is responsible for biomagnification.

2.12 Flagella is the locomotory organ of Paramoecium.

Match the words in column-A with those which are most appropriate in column-B and re-write the correct pair mentioning the serial no. of both columns (any five) : [1 x 5 = 5]

Column – AColumn – B

2.13  blind spot

2.14  Cytokinesis

2.15  44A + XY

2.16  Wings of bat and bird

2.17  Arsenic

2.18  Transfer to stigma

(a) Pollution of ground water

(b) The point of connection of retina and optic nerve.

(c) Homologous organ

(d) Formation of cell plate

(e) Pollen grain

(f) Sound pollution

(g) Chromosomal arrangement  of human male.

Answer in a single word or in a single sentence (any six) : [1 x 6 = 6]

2.19  Choose the odd one and 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.

Prophase: Disappearance of nuclear membrane and nucleolus:: _______: Reappearance of nuclear membrane and nucleolus.

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

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

2.24  Mention one morphological adaptation 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.

Group – C

3. Answer any 12 questions in 2-3 sentences out of 17 questions given below : [2 x 12 = 24]

3.1  Write two differences between tropic movement and nastic movement.

3.2  Write two roles of GTH in the secretion of hormone from the reproductive glands in the human body.

3.3  Categorize the following actions as a natural or inherited reflex action.  Willingness of infants for breast-feeding Cycling, Sneezing, Catching ball by Wicket-keeper with swiftness

3.4  Write the parts of the central nervous system and peripheral nervous system.

3.5  Write two importance of the cell cycle. 

3.6  Distinguish between DNA and RNA based on the following features :  

# Pyrimidine base  

# 5 C sugar

3.7  Which agents perform the function of pollination in the following plants ?

# Paddy     #Hydrilla    #Shimul    #Mango

3.8  State with an example how dominant trait is expressed in the experiment of hybridization.

3.9  What would be the ratio of phenotype and genotype of F2 generation in monohybrid experiment in case of incomplete dominance?  

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

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