Madhyamik  Life Science Question paper 2018

2018

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

1.1  The tentacles on leaves of an insectivorous plant, called sundew bend to trap the insect as soon as they come in contact with the insect body. This is –

(a) Seismonasty

(b) Thermonasty

(c) Photonasty

(d) Chemonasty

1.2  In case of women, the Follicle Stimulating Hormone stimulates the Graafian Follicle of the ovary to secrete the hormone is –

(a) TSH

(b) ADH

(c) Oestrogen

(d) ACTH

1.3  Which one of the following is the correct reflex arc?

(a) Receptor→  Effector → Efferent nerve → Nerve Centre → Afferent nerve

(b) Nerve Centre → Receptor → Afferent nerve → Effector → Efferent nerve

(c) Efferent nerve → Receptor→ Afferent nerve → Nerve Centre → Effector

(d) Receptor → Afferent nerve → Nerve Centre → Efferent nerve → Effector.

1.4  In which stage of mitosis cell division, the nuclear membrane and nucleolus are seen to disappear –

(a) Anaphase

(b) Prophase

(c) Metaphase

(d) Telophese

1.5  Which of the following is not a structural component of DNA –

(a) Deoxyribose sugar

(b) Uracil base

(c) Thymine base

(d) Phosphoric Acid

1.6  Which one of the following statement is correct regarding sexual reproduction –

(a) Haploid gamete formation is essential for sexual reproduction

(b) Sexual reproduction depends only on mitosis

(c) In sexual reproduction, offsprings could be produced from a single parental organism

(d) The offsprings produced in sexual reproduction are genetically identical with parental organism

1.7  Which one of the following is the genotypic ratio at F2 generation of Mendel’s monohybrid cross –

(a) 1: 2 : 1

(b) 3: 5 : 1

(c) 9: 3: 3: 1

(d) 2: 1 : 2

1.8  Which one of the following is not controlled by the autosomal gene of human –

(a) Roller tongue

(b) Haemophilia

(c) Thalassaemia

(d) Attached ear lobe

1.9  What would be the phenotypic ratio in the F2 generation of a monohybrid cross in case of incomplete dominance –

(a) 3: 1

(b) 2 : 1 : 1

(c) 9 : 3 : 3 : 1

(d) 1 : 2 : 1

1.10 Which one of the following is the intraspecific struggle for the same food –

(a) struggle between Vulture and Hyaena

(b) struggle between Eagle and Kite

(c) struggle among the members of Rohu fish in pond

(d) struggle between Egret and Kingfisher .

1.11 Which of the following changes did not occur during the course of evolution of horse –

(a) Lengthening of limb

(b) Increase in the length and thickness of all digits in limbs

(c) Increase in the length and thickness of only the third digit in limbs

(d) Increase in size of the whole body

1.12 According to the opinion of the scientists the prebiotic Environment of the earth that led to the origin of life was like –

(a) Hot dilute soup in the sea water

(b) Cold dilute soup in the sea water

(c) Cold dilute soup in the river water

(d) Hot dilute soup inthe ground water

1.13 Which one of the following microbes take part in nitrification –

(a) Nitrosomonas

(b) Azotobacter

(c) Pseudomonas

(d) Thiobacillus

1.14 An example of Ex-situ conservation is –

(a) Sunderban Tiger Reserve

(b) Corbet National Park

(c) Nilgiri Biosphere Reserve

(d) Cryopreservation .

1.15 Which of the following effect is the result of water pollution –

(a) Global warming

(b) Eutrophication

(c) Deafness

(d) Bronchitis

Group B

2. Answer 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) :

2.1  Due to deficiency of Iodine, the synthesis of _______ hormone is hampered.

2.2  During embryonic development and growth in vertebrates _______ cell division take place.

2.3  The different _______ of Pea Plant may show same Phenotype.

2.4  Homologous organs evolve due to _______ evolution.

2.5  The name of one exotic species, that affects the local biodiversity, is _______.

2.6  The line droplets of smokes, ashes, dusts, pollen grains etc, suspended in air collectively called _______, which cause various lung diseases.

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

2.7  Hypothalamus helps to maintain body balance Inhuman.

2.8  In DNA, Adenine Is linked With Guanine by hydrogen bonds.

2.9  In his monohybrid cross experiment, Mendel obtained 75% pure tall Pea Plants in the first filial generation.

2.10  In Lamarck’s opinion, Organisms can acquire any particular inheritable physical trait according to their need.

2.11  Acid rain is caused by SO2 and NO2 gases formed due to air pollution.

2.12  Auxin helps the seed to germinate by breaking off dormancy.

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 the columns (any five) : [1 x 5 = 5]

Column AColumn B

2.13  CSF

2.14  Crossing over

2.15  Haemophilia

2.16  Coacervate

2.17  JFM

2.18  Grafting

(a)  Large colloidal aggregates

(b)  Active participation of local peoples for restoration of forest.

(c)  Meiosis

(d)  Movement of daughter

chromosomes towards poles

(e)  Disorder caused by recessive

gene located at human X-chromosomes

(f)  Supplies nutrients to brain cells

(g)  Stock and scion

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 :

Dwarfism, Goiter, Thalassaemia, Diabetes Mellitus.

2.20  Mention one function of lens of human eyeball.

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 : : ______: : Spore Mother. cell

2.22  In case of guineapig whether the phenotype of the two genotypes bbRR and bbRr is same?

2.23  Write the phenotypic ratio obtained in the F2 generation of Mendel’s Dihybrid cross experiment.

2.24  Mention one adaptation of Sundari plant for salt tolerance.

2.25  Among the following four terms one includes the other three. Find out that term and Write it :

Overall knowledge regarding local biological resource, PBR, Traditional belief regarding local biological resource, Sustainable use of local biological resource.

2.26  Name one endangered animal conserved at Singalila National Park.

Group C

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

3.1  Reflex actions occur when the following incidents happen in everyday life of human. Write the importance of these two reflex actions.

(i) When food particles enter into the trachea

(ii) When foreign particles enter inside the nasal cavity

3.2  For correction of which defects in vision of eye, spectacles of convex and concave lenses are used?

3.3  List the names of the hormones related to the following functions

(i) Regulation of sugar level in the blood

(ii) Stimulation for the secretion of hormones from the Thyroid gland

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