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2024
LIFE SCIENCE
DIRECTIONS
Regular Candidates will answer questions from Groups A, Band D. External candidates will answer questions from Group E.
(Special Instructions for visually handicapped candidates) Answer Question 4.1 (A) instead of Question 4,1 in Group D. Instruction on how many questions from a group must be attempted is provided in the beginning of the group.
GROUP-‘A’
(Answer to all questions are compulsory)
1. Choose the correct answer for each question and write it with its respective-serial number 1×15=15
1.1 Select the correct pair from the following:
(a) Lens Accomplishes accommodation by changing the curvature of its plane
(b) Retina – Holds the lens with the help of the suspensory ligament
(c) Cornea – Secretes aqueous humor
(d) Choroid – Helps to maintain the shape of the eyeball
1.2 Consider the differences between hormone and nervous system mentioned below and choose which ones are correct:
| Hormone | Nervous System |
| Hormone is a physical coordinator | Nervous system is a chemical coordinator |
| The function of hormones occurs at a slow pace | The function of the nervous system is quick and instant |
| The effect of hormones is long-lasting | The effect of the nervous system is short-lasting |
| Hormones remain unchanged after their function is over | The nervous system gets destroyed after its function is over |
(a) I, IV
(b) II, III
(c) I, III
(d) II, IV
1.3 The natures of Biceps, Pyriformis and Latissimus dorsi muscles respectively are:
(a) Adductor, Extensor, Abductor
(b) Extensor, Flexor, Rotator.
(c) Flexor, Rotator, Adductor
(d) Rotator, Abductor, Adductor
1.4 In a certain phase of mitosis nuclear reticulum is reconstructed, nuclear membrane reappears, regeneration of nucleolus takes place and Spindle fibre disappears. What is the phase?
(a) Prophase
(b) Telophase
(c) Metaphase
(d) Anaphase
1.5 Which of the following events occurs during sexual reproduction of flowering plants?
(a) Zygote is converted into fruit
(b) Zygote is converted into seed
(c) Unicellular zygote is converted into multicellular embryo
(d) Ovary is converted into embryo
1.6 Which structural part of a chromosome may occur either in the middle or at anyone end of the Chromosome?
(a) Telomere
(b) Nucleolar Organizer
(c) Satellite.
(d) Centromere
1.7 What are the dominant and recessive traits regarding the character related to the colour of flower of Pea plant?
(a) Purple and Green
(b) Purple and White
(c) White and Purple
(d) Purple and Yellow
1.8 What is the numerical ratio of the four genotypes BBRR, BBrr, bbRR and bbrr produced in the F2- generation resulting from dihybrid cross in Guinea pig ?
(a) 1:1:1:1
(b) 2:4:2:4
(c) 4:2:2:1
(d) 2:4:1:2
1.9 If a female, looking apparently normal but being carrier of hemophilia, marries a normal male and if two sons and two daughters are born to them, then what would be the probability of manifestation of hemophilia among the children?
(a) 100% hemophilic son and 0% hemophilic daughter
(b) 50% hemophilic son and 50% hemophilic daughter
(c) 0% hemophilic son and 50% hemophilic daughter
(d) 50% hemophilic son, and 50% apparently normal but carrier daughter
1.10 Which of the following is a feature of Equus?
(a) Three digits with hoof on each forelimb and hindlimb
(b) Four digits with hoof on each forelimb and two digits with hoof on each hindlimb
(c) Two digits with hoof on each forelimb and hindlimb
(d) One digit with hoof on each forelimb and hindlimb
1.1.1 Which of the following is an inference of Darwin’s theory of evolution?
(a) Natural Selection
(b) Variation
(c) Prodigality of reproduction
(d) Food and Space is constant
1.12 What is the adaptive feature of Camel related to its ability to withstand extreme water loss?
(a) Cylindrical Red Blood Corpuscle
(b) Circular Red Blood Corpuscle
(c) Oval Red Blood Corpuscle
(d) Cuboidal Red Blood Corpuscle
1.13 With which step of Nitrogen Cycle microbes like Nitroso monas and Nitrobacteria are associated?
(a) Nitrification
(b) Denitrification
(c) Nitrogen fixation
(d) Ammonification
1.14 Which biological hotspots include Mizoram and Nicobar Islands respectively?
(a) Eastern Himalayas, Western Ghats and Sri Lanka
(b) Sunderland, Indo-Burma
(c) Indo-Burma, Sunderland
(d) Sunderland, Eastern Himalayas
1.15 Which types of in-situ conservation are Gorumara, Niigiri and Kulik respectively?
(a) National Park, Biosphere Reserve, Sanctuary
(b) Biosphere Reserve, Sanctuary, National Park
(c) Sanctuary, National Park, Biosphere Reserve
(d) Biosphere Reserve, National Park, National Park
GROUP-B
2. Answer 21 questions out of the 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 nucleated oval________cells occur between Medullary Sheath and Neurilemma of the axon of a neurone.
2.2 Spindle fibres and chromosomes are not formed in the __________cell division.
2.3 Genetic Counselling helps to ascertain the presence of _________gene of Thalassaemia disease,
2.4 The cause of biodiversity on earth is___________
2.5 Excessive amount of _________ is secreted from the walls of bronchi and bronchioles of trachea during Asthma,
2.6 If the detergent rich in ____________ used for washing human clothes gets mixed in a pool, it results in eutrophication.
Decide whether the following statements are True or False (any five) : 1×5=5
2.7 Accommodation is the ability of the retina of the eye to adjust the focal length as needed.
2.8 Mitotic cell division occurs while producing haploid spores.
2.9 The Guinea pig having the genotype BbRr is heterozygous for both the loci.
2.10 Vegetative organs indicate convergent evolution.
2.11 Liquid Nitrogen and -196°C temperature are used in Cryopreservation.
2.12 Blind spot is the part of the eye devoid of light sensitive cells formed at the junction of optic nerve and retina.
Match the words in Column A with the most appropriate words in Column B and rewrite the correct pair mentioning the serial no. of both columns (any five) : 1×5=5
| Column A | Column B |
| 2.13 Adrenaline | (a) Air pollutant |
| 2.14 Self pollination | (b) According to Haldane the hot marine water containing organic compounds |
| 2.15 The position of flower is axial | (c) The adolescent phase of human development |
| 2.16 Hot Dilute Soup | (d) No need of agent |
| 2.17 SPM | (e) The senescence phase of human development |
| 2.18 Brittleness of bone and pain at bone | (f) Increases heart beat, cardiac output, and blood pressure |
| (g) Dominant trait |
Answer in a single word or in a single sentence (any six): 1×6-6
2.19 Choose the odd word and write it: ADH, FSH, LH, TSH.
2.20 What is the name of the plant hormone breaking the dormancy of bud and seed?
2.21 On the basis of the relationship in the first related pair of words, write a suitable word in the gap of the second pair.
Purine: Adenine :: Pyrimidine:_______
2.22 What is the similarity between the two genes responsible for color blindness and hemophilia?
2.23 What is the difference between the two genes responsible for the expression of attached ear lobes and roller tongue ?
2.24 What is the role of salt gland present on the surface of the leaves of Sundari?
2.25 Among the following four terms, one includes the other three. Find it out and write it: Coughing up thick phlegm, Bronchitis, Higher probability of smokers being affected, Inflammation. of the bronchi of Respiratory System of Man.
2.26 Which aspect is the most emphasized in ‘Project Crocodile’ launched for crocodile conservation?
GROUP-C
Answer any 12 questions each in 2-3 sentences out of the 17 questions given below:- 2×12=24
3.1 What are the roles of Insulin hormone regarding the following two aspects related with metabolism of carbohydrates?
• Breakdown of glucose
• Transformation of glucose
3.2 Compare between Myopia and Hyperopia on the following two features:
• Cause
• Symptom
3.3 One of the driving forces of locomotion is “Aggregation for the purpose of reproductive activities” Establish the validity of the statement with the help of two marine animals.
3.4 Which reflex actions does a spectator execute while watching a high voltage game on television?
3.5 Prepare a list of sites of occurrence of meiotic cell division in plants as well as in animals.
3.6 Explain the alternation of generation in Fern with the help of a word diagram,
3.7 How does the Cytokinesis of plant cell happen?
3.8 Explain the following two terms related with heredity –
• Allele
• Locus
3.9 With the help of an example explain how the phenotypic and genotypic ratios found in F2 generation of certain hybrid crosses indicate exception to Mendel’s first law of heredity
3.10. What advantages did Mendel enjoy owing to pea-flowers being bisexual and self pollinating?
3.11 What types of struggle for existence can be found among the animals of a forest over eating meat of a freshly killed prey?
3.12 How does a Rohu fish float and sink in water?
3.13 Prepare a list of reactants used and products in the experiment of Miller and Urey regarding biochemical origin of life.
3.14 What environmental problems can originate if the concentration of different greenhouse gases polluting air increases in a steady manner?
3.15 Explain the causes of endangeredness of Polar Bear and Gangetic Dolphin.
3.16 What might be the environmental causes behind asthma?
3.17 ‘Scarcity of food and poaching are two main reasons behind the endangeredness of a mammal found in Eastern Himalayas biodiversity hotspot’ – Justify the validity of the statement.
GROUP-D
4, Write all the 6 questions or their alternatives given below. Visually handicapped candidates have to answer Question No. 4.1 (A) instead of Question No. 4.1. The marks allotted for each question are 5 (the division of marks is either 3+2, 2+3 or 5). 5×6=30
4.1 Draw a scientific diagram of neuron and label the following parts: 3+2=5
(a) Dendron (b) Myelin Sheath (c) Schwann Cell (d) Node of Ranvier
OR, Draw a scientific diagram of eukaryotic chromosome and label the following parts: 3+2=5
(a) Centromere
(b) Satellite
(c) Nucleolar Organizer
(d) Telomere
(For Visually Handicapped Candidates Only)
4.1. (A) Write one function each of the following five parts of a neuron:
(a) Dendron (b) Axon(c) Myelin Sheath (d) Schwann Cell (e) Node of Ranvier 1×5=5
OR, Write one function each of the following five parts of an eukaryotic chromosome:
(a) Chromatid (b) Centromere (c) Nucleolar Organizer (d) Satellite (e) Telomere 1×5=5
4.2 Write the name of the chemical constituents of eukaryotic chromosome with the help of a table. What happens to a cell when ‘the cell loses control at different points in cell cycle on division? 3+2=5
Or, What events occur during Anaphase stage of mitotic cell division? Show the steps of sexual reproduction of flowering plants with the help of word diagram. 3+2=5
4.3 With the help of a checkerboard show the phenotypic ratio of offspring’s produced in F2 generation as a result of a cross between a pea plant having pure round yellow coloured seed and another pea plant having wrinkled green coloured seed. Write Mendel’s law of heredity derived from this experiment. 3+2=5
OR, Demonstrate a cross for eradication of misconceptions. prevailing among human society regarding the process of determination of sex among children. What are the symptoms of thalassemia? 3+2=5
4.4 What information related to evolution can be obtained from the discussion on comparative structure of hearts of different vertebrate groups? Explain the following two terms in the light of Darwinism –
• Survival of the fittest
• Natural selection
OR Explain the evolutionary significance of homologous and analogous organs with the help of example. What are the adaptive significances of air sacs of Pigeon? 3+2=5
4.5 Explain the following three problems related to ever- increasing human population-
• Over-exploitation and depletion of natural resources
• Changes in atmospheric condition and global warming
• Deforestation and loss of ecosystems
Two major causes behind the loss of biodiversity are over exploitation and destruction of habitat due to change in land use pattern – establish the validity of the statement with proper example.
OR What might be the reasons behind the disturbances in Nitrogen Cycle? It is very much essential to publish a PBR document for each village of India–which information can be gathered from a PBR regarding biodiversity? 3+2=5
4.6 One of the environmental problems of Sunderbans is imbalance in prey-predator number-Justify the validity of the statement with three examples. What are the roles of biosphere reserve and sanctuary in the conservation of biodiversity? 3+2=5
OR, What are the causes for the endangeredness of the following wild animals?
• Royal Bengal Tiger
• One-horned Rhinoceros
• Lion
What are the two effects of air pollution on human health? 3+2=5
OR What events occur during Anaphase stage of mitotic cell division? Show the steps of sexual reproduction of flowering plants with the help of word diagram. 3+2=5
(For External Candidates Only)
GROUP-E
5. Answer any four questions: 1×4=4
5.1 Write one feature of connective tissue.
5.2 What is the function of lysosome?
5.3 Write one function of collenchyma tissue.
5.4 Write one disadvantage of cross pollination.
5.5 Give one example of lipolytic enzyme.
6. Answer any three questions: 2×3=6
6.1 Write the names of the two structural parts of axon:
6.2 Write the names of two non-nitrogenous excretory products of plants.
6.3 Write one function each of cell wall and cell membrane.
6.4 Write the names of two National Parks of West Bengal.
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