Madhyamik Life Science Question paper 2016

2016

Life science

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

[Group A to C are common for both Regular and External Candidates. Group D is meant only for External Candidates]

Sightless Candidates will answer the alternative question as per directive in Group C.

Group A

1. Complete the sentences choosing the correct answer (any five) : [1 x 5 = 5]

(i)  The photosensitive layer of human eyeball is - 

(a) Retina

(b) Sclera

(c) Choroid

(d) Cornea

(ii)  Thyroxin hormone-secreting endocrine gland is -   

(a) Adrenal

(b) Testis

(c) Thyroid

(d) Pancreas

(iii)  The phase of mitosis in which chromosome counting can be done is-

(a) Prophase                  

(b) Metaphase

(c) Anaphase                  

(d) Telophase

(iv)  From hybridization of two hybrid tall pea plants, the percentage of hybrid till offsprings will be obtained in the next filial generation is -    

(a) 25%     (b) 50%    (c) 75%    (d) 100%

(v)  Wings of bird and wings of butterfly are - 

(a) Analogous organ

(b) Vestigeal organ  

(c) Homologous organ

(d) Transplanted organ

(vi)  The plant in which stomata are present on the upper surface of leaf is -                                 

(a) Sundari plant

(b) Lotus plant

(c) Pea plant

(d) Cactus

(viii) A human disease caused by protozoa is - 

(a) Malaria

(b) Filaria 

(c) Cholera

(d) Hepatitis

2. Answer in one sentence (any ten) : [1 x 10 = 10]

(i) Which plant excretory product is used while polishing wooden doors and windows ?

(ii) Name one organic excretory product present in the human urine.

(iii) One function of human ear is hearing, what is the other ?  

(iv) Name the blood sugar controlling hormone secreted from pancreas.

(v) Which plant hormone regulates tropic movement ?

(vi) In which phase of mitosis two sister chromatids get separated ?

(vii) What is the process by which male honeybee or drone is formed from the unfertilized egg of queen bee ?

(viii) Reproduction of Bryophyllum by leafbuds is what kind reproduction? 

(ix) Who is the proponent of the theory of “Natural Selection” ?

(x) Give example of an animal fossil. 

(xi) For what purpose phylloclades of cactus bear a thick cuticle ?

(xii) What are ‘bacteria infecting viruses’ called ?

(xiii) Which fungus, known to you, produces an antibiotic medicine?

3. Attempt any six questions : [2 x 6 = 12]

(i) Write two significance of excretion in animals.

(ii) Mention one function of each of ‘Dendron’ and ‘Axon’.

(iii) Why are hormones called ‘chemical co-ordinators’ ?

(iv) If cytokinesis fails to occur in the division of an animal cell, what would happen ?

(v) In Mendel’s ‘Monohybrid Cross’ experiment a pea plant Producing round seeds is crossed with another pea plant producing wrinkled seeds. What would be the phenotypes of the F2 generation plants and what would be their ratio ? 

(vi) Point out two differences between ‘Homologous organs’ and ’ Analogous organs’.

(vii) Mention the adaptive features of the respiratory organ of pigeon.

(viii) Mention scientific name of a beneficial unicellular fungus and a plant pathogenic multicellular fungus.

4. Attempt any ten questions : [3 x 10 = 30] 

(i) Write two methods of removal of plant excretory product with example.

(ii) What is synapse? Mention to differences between ‘Afferent’ and ‘Efferent’ nerves.  

(iii) Define ‘Nerve Ganglion’. Mention two functions of spinal cord ‘.

(iv)  Write three characteristic features of hormone.

(v)   Write the site of secretion and two functions of progesterone.

(vi)  Point out three differences between ‘Prokaryotic’ cells and ‘Eukaryotic’ cells.

(vii)  Why is ‘Meiosis’ called a reductional division ? What types of cell division occur respectively in the cells of root tip in a higher plant and pollen mother cell ?

(viii) Explain in relation to heredity, how a female child is born in human.

(ix)  Write three differences between Asexual and Sexual reproduction.

(x)   How the hereditary variations are selected by ‘Natural Selection’?

(xi)   Discuss three adaptive characteristics of cactus with reasons.

(xii)  Name two diseases causing protozoa. What is the utility of drinking boiled water?

(xiii)  Name three diseases of children which can be prevented through universal immunization.

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