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2017
LIFE SCIENCE
(New Syllabus)
DIRECTIONS
Group ‘A’
(Answer to all questions is compulsory)
1. Write the answer in complete sentences by choosing the correct answer for each question with the respective serial number. 1×15=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 hormones in adequate quantity:
(a) Adrenaline
(b) Insulin
(c) Thyroxine
(d) Testosterone
1.3 The part of the 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) Telophase
(c) Anaphase
(d) Metaphase
1.5 Which of the following pairs 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 organs and reproductive glands:
(a) Childhood
(b) Adolescence
(c) Late Adulthood
(d) Infancy
1.7 Which of the following traits in the 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 a 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 a 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 and functions are also different
(b) Different in origin but functions are the same
(c) Indicates divergent evolution
(d) Identical in origin and structure
1.12 Which of the following absorbs the gas of the swim bladder in bony fishes:
(a) Red gland
(b) Anterior chamber
(c) Gastric gland
(d) Retia Mirabilia
1.13 Which of the following phases of the nitrogen cycle is Pseudomonas associated with:
(a) Nitrogen fixation
(b) Nitrification
(c) Denitrification
(d) Ammonification
1.14 One endangered species of the Eastern Himalayas biodiversity hotspot is:
(a) Lion-tailed macaque
(b) Orangutan
(c) Red Panda
(d) Nilgiri Tahr
1.15 The diseases associated with air pollution are:
(a) Diarrhoea, Typhoid, Hepatitis
(b) Hepatitis, Bronchitis, 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.) 1×21=21
Fill in the blanks with proper words in the following sentences (any five):1×5=5
2.1 The process of necessary adjustment of focal length of the lens in the human eye is called __________.
2.2 Adenine is a type of __________ nitrogenous base.
2.3 __________ is a disease created by sex-linked genes.
2.4 The earliest ancestor in the evolution of the horse is __________.
2.5 An inflammable greenhouse gas produced from paddy fields is __________.
2.6 __________ is a biosphere reserve located in West Bengal.
Decide whether the following statements are true or false (any five):1×5=5
2.7. Gibberellin hormone prevents immature shedding of leaves 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 the 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 number of both columns (any five): 1×5=5
| Column-A | Column-B |
| 2.13. Blind Spot | (a) Pollution of groundwater |
| 2.14. Cytokinesis | (b) The point of connection of 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 word or in a single sentence (any six): 1×6=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 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 generations.
2.23. Which type of chromosome in humans 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: 2×12=24
3.1 Write two differences between tropic movement and nastic movement.
3.2 Write two roles of GTH in the secretion of hormones from the reproductive glands in the human body.
3.3 Categorize the following actions as natural or inherited reflex action:
Willingness of infants for breast-feeding
Cycling
Sneezing
Catching a ball by a wicket-keeper with swiftness.
3.4 Write the parts of the central nervous system and peripheral nervous system.
3.5 Write two importances 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 the dominant trait is expressed in the experiment of hybridization.
3.9 What would be the ratio of phenotype and genotype of the F₂ generation in a monohybrid experiment in the case of incomplete dominance?
3.10 Show with the help of a cross how colour blindness is inherited.
3.11 Write the names of reactants used and one organic compound formed in the experiment of Miller and Urey in connection with the chemical origin of life.
3.12 Write four important features modified in the evolution of the horse.
3.13 How does the Sundari plant excrete the excess salt from its body?
3.14 Write the names of two microorganisms participating in the process of biological nitrogen fixation.
3.15 Mention two damages as a result of acid rain.
3.16 Give four examples of damages to biodiversity as a result of global warming.
3.17 Write the major topics regarding biodiversity documented in People’s Biodiversity Register (PBR).
Group ‘D’
4. Answer 6 questions or their alternatives given below. Sightless candidates have to answer Question No. 4.1(A) instead of 4.1. 5×6=30
4.1 Draw a neat diagram of the vertical section of the eyeball of the human eye and label the following parts:
(a) Cornea (b) Lens (c) Vitreous humor (d) Retina.
OR
4.2 Draw a neat diagram of metaphase of mitosis of a plant cell or an animal cell division and label the following parts:
(a) Chromosome (b) Spindle fibre (c) Polar region (d) Centromere.
(FOR SIGHTLESS CANDIDATES ONLY)
4.1(A). Write one function of each of the following parts of the eyeball of the human eye:
(a) Cornea (b) Choroid (c) Lens (d) Vitreous humor (e) Retina.
OR
Write two features of metaphase of mitosis of a plant cell division and three features of anaphase of an animal cell division.
4.2 Explain the inter-relationships among chromosome, DNA, and gene. Distinguish between euchromatin and heterochromatin on the following two aspects:
(i) Coiling
(ii) activity.
OR
How is micropropagation done? State what happens in the following three phases of sexual reproduction of flowering plants:
(i) Production of gametes or reproductive cells
(ii) Fertilization
(iii) Formation of embryos and new plants.
4.3 With the help of a checkerboard, show the types of offspring that might be produced in a cross between a hybrid black guinea pig and a pure white guinea pig. State the law of segregation as proposed by Mendel.
OR
Mention the symptoms of thalassemia disease. In many families, mothers are labelled as responsible for the birth of daughter children. Demonstrate with the help of a cross that this belief is not justified.
4.4 Mention two features of internal structures on the basis of which ‘flipper of whales’ and ‘wings of birds’ are considered homologous organs. How does a worker bee of a beehive communicate with other worker bees regarding the source and location of food?
OR
Show the major evolutionary events with the help of a flowchart.
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 rhinos. Make your opinion based on your experiences about how the sources of fresh water become polluted.
OR
Which conditions do you consider to declare one area as a biodiversity hotspot? Give two examples of ex-situ conservation.
Group ‘E’
(FOR EXTERNAL CANDIDATES ONLY)
5. Answer any 4 questions: 1×4=4
5.1 Mention one feature of unstriated muscle.
5.2 Which cell organelle is referred to as the “kitchen of the cell”?
5.3 In which type of cell is the nucleus not well organized?
5.4 Give an example of a flower pollinated by air.
5.5 Write one important feature of life.
6. Answer any 3 questions: 2×3=6
6.1 Write two features of epithelial tissue.
6.2 Write two functions of collenchyma tissue.
6.3 Write two differences between plant cells and animal cells.
6.4 Give one example each of prokaryotic and eukaryotic cells.
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