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2019
LIFE SCIENCE
(New Syllabus)
(For Regular & External Candidates)
GROUP-A
(Answer to all questions is compulsory)
Write the answer in complete sentences by choosing the correct answer for each question with its respective serial number: 1×15=15
1.1 Select which of the following statements is correct related to tropic movement:
(a) It is controlled by the intensity of the stimulus
(b) Overall change of place takes place by a plant or part of the plant
(c) This movement is observed in the algae called Volvox
(d) It is an induced movement of curvature controlled by the direction of the stimulus
1.2 Read the following sentences and identify the sentence which is not correct:
(a) FSH, LH, and Prolactin are different types of GTH
(b) Adrenaline decreases cardiac output
(c) Insulin facilitates the absorption of glucose into the cell through the cell membrane
(d) Progesterone helps in the formation of placenta in the female body
1.3 Determine the number of Cranial nerves in the human body:
(a) 10 Pairs
(b) 31 Pairs
(c) 12 Pairs
(d) 21 Pairs
1.4 Identify the correct feature of Amitosis cell division:
(a) Occurs in germ mother cells of sexually reproducing organisms
(b) It is called indirect cell division
(c) Chromosomes and spindle fibres are formed
(d) Chromosomes and spindle fibres are not formed
1.5 Determine which of the following statements is correct regarding the significance of meiosis:
(a) It results in overall growth and development of the body
(b) It results in the growth of reproductive organs and embryo of the organism
(c) It produces haploid gametes containing hereditary variations
(d) It regenerates the organ in the body of some animals if it is lost
1.6 Select the correct pair and write it:
(a) Multiple fission – Hydra
(b) Fragmentation – Spirogyra
(c) Regeneration – Fern
(d) Budding – Planaria
1.7 Identify which of the following is a dominant trait:
(a) Length of the stem – Dwarf
(b) Shape of the seed – Wrinkled
(c) Colour of the cotyledon – Yellow
(d) Colour of the flower – White
1.8 Assess how many types of gametes are produced from the Pea plant having the genotype RRYY:
(a) One type
(b) Four types
(c) Two types
(d) Three types
1.9 Select which of the following two genotypes are responsible for the expression of the phenotype wrinkled yellow in Pea plant:
(a) RRYY and rryy
(b) RRYy and RrYy
(c) RRyy and Rryy
(d) YY and ПYy
1.10 Identify which of the following indicates inter-specific struggle:
(a) Struggle among the members of guppy fish for feeding on mosquito larvae
(b) Struggle between snakes and owls for capturing rats for eating
(c) Struggle within a group of deer for feeding on grass at the same location
(d) Struggle between tigers in a jungle for preying on deer
1.11 Determine the term related to the theory of Lamarck:
(a) Struggle for existence
(b) Origin of variation
(c) Inheritance of acquired characters
(d) Natural selection
1.12 Identify the animal who communicates information with other members of its own group through specific dancing patterns regarding the sources of food:
(a) Chimpanzee
(b) Cockroach
(c) Peacock
(d) Honeybee
1.13 Decide which of the following, if it remains for a long time in the environment, increases the probability of its biomagnification:
(a) Newspaper
(b) Faecal matters of animals
(c) Rotten leaves
(d) Chlorinated insecticide
1.14 Gorumara, Corbett, Kulik, Nandadevi – choose the correct sequence from the following which is correct for the above forests in sequence:
(a) Biosphere Reserve, Sanctuary, National Park, National Park
(b) National Park, National Park, Biosphere Reserve, Sanctuary
(c) National Park, National Park, Sanctuary, Biosphere Reserve
(d) Sanctuary, Biosphere Reserve, National Park, Sanctuary
1.15 If the amount of pollen grains, fungal spores, and dust particles increase suddenly in the air, decide which of the following problems may increase:
(a) Tuberculosis
(b) Asthma
(c) Malaria
(d) Dengue
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 By the influence of __________ hormone, the hairs on the skin get erected in an emergency situation.
2.2 Chromosome is the condensed coiled structure of __________ molecule.
2.3 The sexual reproduction that occurs among two genotypically different organisms belonging to the same species is called __________.
2.4 __________ was the aggregate of some large colloidal molecules during the early phase of the origin of life.
2.5 __________ is derived from the root of the Sarpagandha plant, which is used as medicine for lowering high blood pressure.
2.6 The ex situ conservation by keeping sample seeds in liquid nitrogen at a temperature of_____________-196°C is called.
Decide whether the following statements are true or false (any five): 1×5=5
2.7 Dilute urine is profusely eliminated by a person affected with Diabetes Insipidus.
2.8 The Carpel of flowering plants collects pollen grains with the help of hairy and sticky style.
2.9 A pair of sex-determining sex chromosomes are present in the ovum of humans.
2.10 According to Darwin, organisms reproduce at a geometric ratio.
2.11 One-horned rhinoceros is conserved at Manas National Park of West Bengal.
2.12 Acetylcholine and adrenaline are neurotransmitters.
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 Presbyopia | (a) BbRr |
| 2.14 Cell Differentiation | (b) Haldane |
| 2.15 Genotype of Guinea pig having black and coarse hair | (c) Near vision is defective |
| 2.16 Hot Dilute Soup | (d) Change of climate and global warming |
| 2.17 Destruction of forest and erosion of ecosystem | (e) Formation of spindle fibre during animal cell division |
| 2.18 Centrosome | (f) Formation of tissue, organ, and system |
Answer in a single word or in a single sentence (any six): 1×6=6
2.19 Choose the odd one and write it: Glossopharyngeal, Oculomotor, Trigeminal, Oxytocin
2.20 What is the function of the fluid present in the intermediate chamber between the lens and retina of the 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 the second pair:
Grafting: Mango :: __________ : China Rose
2.22 What is the cause of expression of haemophilia disease only at homozygous condition?
2.23 Write the genotypic ratio obtained at the 2nd filial generation in the monohybrid experiment done by Mendel.
2.24 Which type of evolution is indicated by homologous organs?
2.25 Among the following four terms, one includes the other three. Find it out and write it: Pesticides used in Agriculture, Typhoid, Water Pollution, Liquid wastes from factories.
2.26 In which type of in situ conservation practice, the diversity, culture, and lifestyle of humans is preserved along with microorganisms, wild animals, and wild plants?
GROUP-C
3. Answer any 12 questions in 2-3 sentences out of 17 questions given below: 2×12=24
3.1 Illustrate with the help of a word diagram the nervous pathway of the way you will open the door by hearing the doorbell.
3.2 State the locations of Meninges and CSF.
3.3 What influences do gibberellin hormones exert on the seeds and internodes of plants? Explain.
3.4 Write the names of the different refractive mediums of the eyeball in proper sequence.
3.5 During meiosis cell division, reduction in the number of chromosomes and exchange of segments between chromatids take place. Analyze what are the significances of these two phenomena.
3.6 Distinguish between asexual and sexual reproduction based on the following features:
- Number of Parents
- Nature of Offspring
3.7 Identify the stages of Karyokinesis of mitotic cell division depending on the following features:
- Alignment of chromosomes along the equator of the cell and their arrangement in a definite pattern
- Disintegration of spindle fibers
- Disappearance of nuclear membrane and nucleolus
- Movement of daughter chromosomes to the opposite poles of the cell
3.8 To establish the law of segregation in the case of Pea plants, you are asked to select characters. Write two such characters having opposite traits.
3.9 A daughter is born to a woman carrier for the color-blind disease who married a color-blind man. What would be the probability of expression of color blindness in that girl child? Analyze your answer.
3.10 Write the names of two genetic diseases which are expressed in human populations.
3.11 Tigers are extinct but there are many deer in the jungle. A few tigers are brought from another sanctuary and released into such a jungle. Imagine and write the names of the different kinds of struggles for existence those tigers have to be involved in.
3.12 Describe any two adaptations in the Sundari plant for tolerance of salt.
3.13 Explain how chimpanzees hunt termites for food.
3.14 List the harmful effects of the following pollutants:
- Greenhouse gases
- SPM (Suspended Particulate Matter)
- Chemical fertilizers used in agriculture
- Non-biodegradable chemical insecticides
3.15 Give one example of exotic species causing damage to local biodiversity in each of the terrestrial and aquatic ecosystems.
3.16 Write the in-situ conservation measures taken for one endangered reptile species and name one site of such conservation in West Bengal.
3.17 “Poaching is one of the fundamental causes of endangeredness of animal diversity in India.” Assess four causes for which animals are poached in India.
GROUP-D
Answer six 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 a neuron and label the following parts:
(a) Dendron
(b) Node of Ranvier
(c) Myelin sheath
(d) Schwann cell
Or
Draw a neat diagram of anaphase of mitosis of an animal cell and label the following parts:
(a) Polar region
(b) Spindle fiber
(c) Chromatid
(d) Centromere
(FOR SIGHTLESS CANDIDATES ONLY)
4.1(A) Write one function each of the following five parts of a neurone:
(a) Dendron
(b) Cell body
(c) Axon
(d) Myelin sheath
(e) Schwann cell
Or
Mention three changes that occur in the anaphase stage of mitosis in animal cells. Write the names of any two structural parts of eukaryotic chromosomes.
4.2 Why is reproduction important for an organism?
“Meiosis is characteristically different from Mitosis.” How would you justify the statement?
Or
Describe five processes of asexual reproduction with one suitable example for each.
4.3 Show the result of hybridization till the F₂ generation between a pure black (BB) coarse-haired (RR) guinea pig and a pure white (bb) smooth-haired (rr) guinea pig using a checkerboard. State the conclusion one can reach from this hybridization experiment.
Or
What symptoms are expressed in a child affected with Thalassemia? What suggestions are given at the time of genetic counseling in such cases?
4.5 Describe the brief outline of the chemical origin of life, mentioning Miller and Urey’s experiment.
Or
Describe two major tenets of Lamarck’s evolutionary theory. How does the comparative anatomy of hearts act as proof in favor of the evolutionary theory?
4.5 Analyze the role of bacteria at any three steps of the nitrogen cycle.
“Luxurious and comfortable lifestyle is one of the major reasons for air pollution.” Support the statement with arguments.
Or
Give two examples of animal biodiversity endangered by the pollution of the river Ganga. Explain any three incidences that are occurring as a result of the disruption of the nitrogen cycle.
4.6 “Change of climate and global warming is a problem resulting from increasing human population.” Summarize what impacts it might exert on the environment.
“Children and adults both suffer from different respiratory problems during the winter.” Write two names of such problems and state one symptom of each of them.
Or
You have identified three environmental problems while conducting research in Sunderbans:
- Imbalance in prey-predator numbers
- Destruction of mangroves
- Submergence of islands due to rising sea levels
Analyze what impacts they might exert on biodiversity.
Write the location of the Sundaland hotspot and name one important species of its biodiversity.
GROUP-E
(FOR EXTERNAL CANDIDATES ONLY)
(Answer any FOUR questions): 1×4=4
5.1 Mention one feature of striated muscle.
5.2 Which cell organelle is referred to as the “factory for protein synthesis”?
5.3 Give an example of an organism having a prokaryotic cell.
5.4 Give an example of a hydrophilous flower.
5.5 Write one function of the centrosome.
(Answer any THREE questions): 2×3=6
6.1 Write two features of connective tissue.
6.2 Write two functions of Parenchyma tissue.
6.3 Mention two locations of meristematic tissue in the plant body.
6.4 Write the names of any two important physiological processes occurring in organisms.
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