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Kerala Syllabus Class 10 Biology Question Paper March 2022 with Answers English Medium
Time: 1½ Hours
Total Score: 40
Instructions:
- There is a ‘Cool-off time’ of 15 minutes in addition to the writing time.
- Use this time to get familiar with questions and to plan your answer.
- Questions with different scores are given as distinct parts.
- Read the instructions carefully before answering the questions.
- Keep in mind, the score and time while answering the questions.
- The maximum score for questions from 1 to 24 will be 40.
Part – I
(A) Answer any 4 questions from 1 to 6. Each carries 1 score. (4 × 1 = 4)
Question 1.
Identify the given photoreceptor cell.
Answer:
Cone Cell
Question 2.
If there is any mistake in the underlined part of the given statements, correct it.
(a) Chemical evolution theory was proposed bv Oparin and Haldane.
(b) Organic molecules such as Nucleic acids are formed in the Urey-Miller experiment.
Answer:
(b) Amino acids
Question 3.
Find the genetic constitution of the sperm.
(a) 44 + X
(b) 22 + XX
(c) 44 + XX
(d) 22 + Y
Answer:
(d) 22 + Y
Question 4.
Choose the correct pair.
- Dormancy of embryo: Cytokinin
- Sprouting of leaves: Abscisic acid
- Fruit formation: Gibberellin
- Ripening of leaves and fruits: Ethylene
Answer:
Ripening of Leaves and Fruits: Ethylene
(B) Answer all questions from 7 to 9. Each carries 1 score. (3 × 1 = 3)
Question 5.
Identify the blood group that has the following peculiarities.
| Antigen A | Antigen B | Antigen D |
| Nil | Present | Nil |
Answer:
B-ve
Question 6.
The vector used in genetic engineering is:
(a) Ligase
(b) Plasmid
(c) tRNA
(d) rRNA
Answer:
(b) Plasmid
Answer all questions from 7 to 9. Each carries 1 score. (3 × 1 = 3)
Question 7.
Identify the word pair relationship and fill in the blanks.
Housefly: Ommatidia
Planaria: ____________
Answer:
Planaria: Eye Sport
Question 8.
Choose the action of the sympathetic system from the following.
(a) Peristalsis becomes normal
(b) Heartbeat increases
(c) Gastric activities become normal
(d) Trachea contracts
Answer:
(b) Heartbeat increases
Question 9.
Based on the given model (A) complete (B).
Answer:
(i) Bacteria
(ii) Leptospira
Part – II
(A) Answer the following question. Carries 2 scores. (1 × 2 = 2)
Question 10.
Analyze the given statement and answer the following questions.
“Genetic engineering has made a great leap in the treatment of genetic diseases”.
(a) Name the treatment method indicated. (1)
(b) What is the specific peculiarity of this treatment method? (1)
Answer:
(a) Gene therapy
(b) It is a method of treatment in which genes that are responsible for diseases are removed and normal functional genes are inserted in their place.
(B) Answer any 1 of the questions from 11 and 12. Each carries 2 scores. (1 × 2 = 2)
Question 11.
Observe the illustration and answer the following questions.
(a) Fill (i). (1)
(b) What are the characteristics of organisms belonging to (ii)? (1)
Answer:
(a) (i) Cercopithecoidea.
(b) (ii) Developed brain, freely movable hands.
Question 12.
Analyze the given genetic makeup and answer the questions.
(a) Give the number of somatic chromosomes. (1)
(b) Is the individual with this genetic makeup male or female? Why?
Answer:
(a) 44
(b) Female, because XX are the sex chromosomes of females.
Part – III
(A) Answer any 3 questions from 13 to 16. Each carries 3 scores. (3 × 3 = 9)
Question 13.
Analyse the given table and arrange Columns B and C according to Column A.
| A | B | C |
| Cornea | The part of the retina where. Plenty of photoreceptors are present. | Transmits impulses from photoreceptors to the visual centre in the brain. |
| Pupil | The projected transparent anterior part of the sclera. | Regulates the amount of light falling on the eyes. |
| Yellow Spot | The part of the retina from where the optic nerve begins. | Refracts light rays to focus on the retina. |
| The aperture is seen at the center of the iris. | Point of maximum visual clarity. |
Answer:
| A | B | C |
| Cornea | The projected transparent anterior part of the sclera. | Refracts light rays to focus on the retina. |
| Pupil | The aperture is seen at the center of the iris. | Regulates the amount of light falling on the eyes. |
| Yellow Spot | The part of the retina where plenty of photoreceptors are present. | Point of maximum visual clarity. |
Question 14.
Evaluate the statement and answer the questions.
“Ants moving in a line along a particular trail by the production of certain chemical substances”.
(a) Such chemicals are known as ____________ (1)
(b) Write two examples of these chemical substances. (1)
(c) Write the other two uses of these chemical substances. (1)
Answer:
(a) Pheromones
(b) Civetone, Muscone, Bombykol (any 2)
(c) Help in attracting mates.
To inform the availability of food
To determine the path of travel
Signalling dangers. (any 2)
Question 15.
Observe the illustration and answer the questions.
(a) Identify the part indicated (i). (1)
(b) Name any two chemicals which provide rigidity to the part indicated (i). (1)
(c) How do the germs that have crossed (i) are prevented from entering the cell? (1)
Answer:
(a) (i) Cell Wall
(b) Lignin, Cutine, Suberin (any 2)
(c) They are prevented from entering through the cell membrane by callose, a polysaccharide formed in the cell wall.
Question 16.
Analyze the information related to Tuberculosis and Malaria. (3)
- Classify them in the given table.
- Spread through the air
- Bacteria is the pathogen
- High fever with shivering and profuse sweating
- Spread through Anopheles mosquito
- Loss of body weight, fatigue, persistent cough
- Protozoa is the pathogen
Answer:
| Tuberculosis | Malaria |
| Spread through the air. | Spread through Anopheles mosquito. |
| Bacteria is the pathogen.P | rotozoa is the pathogen. |
| Loss of body weight, fatigue, persistent cough. | High fever with shivering and profuse sweating. |
(B) Answer the following question. Carries a 3 score. (1 × 3 = 3)
Question 17.
Analyze the picture given below and answer the questions.
(a) Identify (i). (1)
(b) Write any two functions of this part. (2)
Answer:
(a) (i) Myelin sheath/Schwann cells.
(b) Provides nutrients and oxygen to the axon.
Accelerate impulse.
Act as an electric insulator.
Protects the axon from external shocks. (any 2)
Part – IV
(A) Answer any 2 of the questions from 18 to 20. Each carries 4 scores. (2 × 4 = 8)
Question 18.
Change in the shape of Red blood cells in a genetic disease is given below. Analyze it an answer the questions.
(a) Name the disease indicated. (1)
(b) Why do the shape of Red Blood Cells change? (1)
(c) How does the deformity of red blood cells affect the body? (2)
Answer:
(a) Sickle Cell Anaemia
(b) Defects of genes cause deformities in the sequencing of amino acids which are the building blocks of hemoglobin.
(c) Decreases the oxygen-carrying capacity of red blood cells. The RBCs in the shape of sickles aggregate and block the flow of blood through the blood vessels.
Question 19.
Observe the illustration given below and answer the questions.
(a) Fill (i), (ii), (iii), (iv). (2)
(b) Which is the dominant character? (2)
(c) Why does the recessive trait in the first generation appear in the second generation? (1)
Answer:
(a) (i) r
(ii) Rr
(iii) Rr
(iv) rr
(b) Round
(c) During gametic formation the factors that determine a particular character segregate without getting mixed.
Question 20.
The following are the main concepts of the theory of evolution. Analyze it and answer the following questions.
(i) Accumulation of variations inherited through generations.
(ii) Origin of new species.
(iii) Struggle for existence.
(iv) Favourable variations are transferred to the next generation.
(v) Those with no favorable variations are destroyed and the survival of others.
(vi) Overproduction.
(a) Name of the evolutionary theory. (1)
(b) Rearrange the concepts given above in sequential order. (3)
Answer:
(a) Theory of Natural Selection/Darwinism.
(b) (vi) Overproduction.
(iii) Struggle for existence.
(v) Those with no favorable variations are destroyed and the survival of others.
(iv) Favorable variations are transferred to the next generation.
(i) Accumulation of variations inherited through generations.
(ii) Origin of new species.
(B) Answer any 1 question from 21 to 22. Each carries 4 scores. (1 × 4 = 4)
Question 21.
The feature of a fluid in the eye is given below. Analyze it and answer the following questions.
It is formed blood and is reabsorbed into blood
(a) Name the fluid. (1)
(b) What is its function? (1)
(c) Name the eye disease associated with this fluid. (1)
(d) How does this diseases can be rectified? (1)
Answer:
(a) Aqueous Humor
(b) Provides oxygen and nutrients to tissues of the eye
(c) Glaucoma
(d) By Laser Surgery
Question 22.
Analyze the illustration related to the process of blood clotting and answer the following questions.
(a) Name the enzyme indicated as “X”. (1)
(b) How does this enzyme form? (1)
(c) Write the subsequent steps involved in this process. (2)
Answer:
(a) X = Thromboplastin
(b) Tissues and platelets at the site of the wound degenerate to form thromboplastin.
(d) The red blood cells and platelets get entangled in the network of fibrin fibers to form the blood cot.
Part – V
(A) Answer any 1 question from 23 to 24. Each carries 5 scores. (1 × 5 = 5)
Question 23.
Redraw the diagram, and answer the following questions.
Redrawing diagram
(a) Identify and label the parts with their names. (1)
(i) Maintains equilibrium of the body. (1)
(ii) Controls voluntary movements. (1)
(iii) Acts as a relay station of impulses. (1)
(b) Name the part labeled “X” and write its function. (1)
Answer:
(a)
(b) X = Medulla Oblongata
Controls involuntary actions like heartbeat, breathing, etc.
Question 24.
Analyze the process related to the regulation of blood glucose levels and answer the questions.
(a) Identify the hormones indicated as X and Y. (1)
(b) Name the gland which produces these hormones. (1)
(c) Name the disease caused due to the reduced production of the hormone X. (1)
(d) Write the symptoms of this disease. (1)
(e) Write another action of the hormone Y in regulating the level of glucose in the blood. (1)
Answer:
(a) X = Insulin, Y = Glucagon
(b) Pancreas
(c) Diabetes Mellitus
(d) Increased appetite and thirst and frequent urination
(e) Synthesizes glucose from amino acids.