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Life Science Question Paper 2017

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Group A

1.Multiple choice question.

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
(c) Thyroxine

1.3 The part of human brain associated with controlling body temperature is
(a) Thalamus
(b) Cerebellum
(c) Hypothalamus
(d) Medulla

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 pair is correct
(a) Budding-Yeast
(b) Fragmentation
(c) Sphere-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 pea plant having genotype YyRr?
(a) 1
(c) 2
(d) 3

1.9 The probability of haemophilic girl children born to a hodophilia carrier mother and normal father is –
(a) 75%
(b) 50%
(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 analogues organ is –
(a) Different in origin and function are also different
(b) Different in origin but function 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) Ammonification

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, Hepahepatitis,
(b) Hepahepatitis, Bronchitis, Deafness
(c) Bronchitis, Asthma, Lung cancer
(d) Lung cancer, Polio, Malaria

Group B

2. Answer the following question (alternatives are to be noted).

Fill in the blanks:
2.1 The process of necessary adjustment of the focal length of the lens in human eyes is called ____.

2.2 Adenine is a __ type of nitrogenous base.

2.3 __ is a disease created by the sex-linked genes.

2.4 The earliest ancestor in the evolution of horses is ___.

2.5 An inflammable greenhouse gas produced from the paddy field is __.

2.6 ____ is a biosphere reserve located in West Bengal.

Decide whether the following statements are true or false (any five)
2.7 Gibberellin hormone prevents immature shedding of the leaf of plants.

2.8 Ovum is only produced as a result of mitosis.

2.9 Self – 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 Paramecium.

Match the right column with the left column: (Any five)

2.13) Blind Spota) Pollution of ground water
2.14)Cytokinesisb)The point of connection of retina and optic nerve
2.15)44A+XYc)Homologous organs
2.16)Wings of bat and birdsd)Formation of cell plates
2.17)Arsenice)Pollen grain
2.18)Transfer to stigmaf)Sound pollution
 g)Chromosomal attachments of human male

Answer in a single word or in a single sentence (any six) :
2.19 Choose the odd one and write it: TSH, ACTH, GTH, CSF

2.20 Write one function of the 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 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 with the generation.

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

2.24 Mention one morphological adaption of the 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 Sundarbans.

Group C

3. Answer any 12 questions in 2-3 sentences out of 17 questions given below:
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 actions.
The 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 important 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 of how the dominant trait is expressed in the experiment of hybridization.

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

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

3.11 Write the name of reactants used and one origin 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 Sundari plant excretes the excess salt of its body?

3.14 Write the names of two micro-organisms 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 the People’s Biodiversity Register (PBR).

Group D

4. Answer 6 questions or their alternative given below.
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, 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 fiber (c) Polar region (d) Centromere

4.2 Explain the interrelationship among chromosomes and genes distinguish between euchromatin and heterochromatin on the following two aspects. (a) Coiling (b) Activity
Or, How micropropagation is done state that happens in the following three phases of sexual reproduction of flowering plants:- 
(a) Production of gamete or reproductive cell
(b) Fertilization
(c) Formation of the embryo and new plant

4.3 With the help of checkerboard show the types of offsprings that might be produced in a cross between a hybrid black guineapig and a pure white guineapig. State the law of segregation as proposed by Mendel.
Or, Mention the symptoms of thalassemia disease. In many families, mothers are labeled as responsible for the birth of a daughter child. Demonstrate with the help of a cross, that these believe is not justified.

4.4 Mentions two features of internal structures on the basis of which, ‘flipper of whales’ and ‘wings of birds’ are considered as homologous organs. How a worker bee of a beehive communicates with other worker bees regarding the 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 on the conservation of biodiversity?
Or, Assess the causes of depletion of the 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 experience of how the source of freshwater becomes polluted.
Or, Which conditions do you consider to declare one area out of two as a biodiversity hotspot? Give two examples of ex-situ conservation.

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