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Kerala Syllabus Class 10 Biology Board Model Paper March 2021 with Answers English Medium
Time: 1½ Hours
Total Score: 40
Instructions:
- 20 minutes is given as cool-off time.
- Use cool-off time to read the questions and plan your answers.
- Attempt the questions according to the instructions.
- Keep in mind, the score and time while answering the questions.
- The maximum score for questions from 1 to 36 will be 40.
1 score for each question from 1 to 10.
Question 1.
Identify the word pair relation and fill in the blank. (1)
Female Silkworm Moth: Bombykol
Civet Cat: _________________
Answer:
Civetone
Question 2.
Correct mistakes if any in the underlined part of the given statements. (1)
(a) The layer which has photoreceptors is called Retina.
(b) The yellow spot is the part of the retina that has no vision.
(c) The aperture seen at the center of the iris is called the pupil.
Answer:
(b) A blind spot is part of the retina having no vision.
Question 3.
What does X indicate?
- Sensory nerve
- Mixed nerve
- Motor nerve
- Interneuron
Answer:
X: Sensory nerve
Question 4.
Observe the given figure and identify the parts labeled as A and B. (1)
Answer:
A: Phosphate
B: Sugar Molecule
Question 5.
A hint on a theory of evolution is given below: (1)
| Chemical Substances → Life in Sea Water |
Identify the theory.
Answer:
Chemical Evolution Theory
Question 6.
Which of the following enzymes is called Genetic Scissors? (1)
- Thromboplastin
- Lysozyme
- Restriction Endonuclease
- Ligase
Answer:
Restriction Endonuclease
Question 7.
Name the plant hormone which controls the ripening of leaves and fruits. (1)
Answer:
Ethylene
Question 8.
Which among the following is the correct pair related to Malaria? (1)
- Filarial Worm – Culex Mosquito
- Filarial Worm – Anopheles Mosquito
- Plasmodium – Anopheles Mosquito
- Plasmodium – Culex Mosquito
Answer:
Plasmodium – Anopheles Mosquito
Question 9.
Name the protein in the epidermis of the skin that prevents the entry of germs. (1)
Answer:
Keratin
Question 10.
Which of the following is a protein made through genetic engineering and is used for the treatment of viral disease?
- Interferons
- Insulin
- Endorphin
- Somatotropin
Answer:
Interferons
2 scores for each question from 11 to 22.
Question 11.
Symptoms of the disease are given below:
- Loss of memory
- Inability to recognize friends and relatives
(a) Identify the disease. (1)
(b) What is the cause of this disease? (1)
Answer:
(a) Alzheimers
(b) Accumulation of an insoluble protein in the neural tissues of the brain. Neurons get destroyed.
Question 12.
Observe the figure and answer the questions.
(a) Identify the cells A and B. (1)
(b) Name the visual pigment present in each of them. (1)
Answer:
(a) A: Rod Cells
B: Cone Cells
(b) A: Rod Cells: Rhodopsin
B: Cone Cells: Photopsin or Iodopsin
Question 13.
Draw a nucleotide seen only in DNA using the components given below: (2)
Answer:
Question 14.
Read the newspaper report and answer the questions.
(a) Which is the scientific test mentioned in this news? (1)
(b) What is the scientific basis of this technology? (1)
Answer:
(a) DNA fingerprinting/DNA profiling.
(b) The arrangement of nucleotides in the DNA differs in each person.
Question 15.
Rearrange the columns B and C according to the information in column A. (2)
| A. Disease | B. Cause | C. Symptoms |
| Night Blindness | The eye lens becomes opaque. | Cannot distinguish green and red colours. |
| Colour Blindness | Deficiency of Vitamin A. | Increase in the pressure inside the eye. |
| Defect of cone cells. | Cannot see clearly in dim light. |
Answer:
| A. Disease | B. Cause | C. Symptoms |
| Night Blindness | Deficiency of Vitamin A. | Cannot see clearly in dim light. |
| Colour Blindness | Defect of cone cells. | Cannot distinguish green and red colours. |
Question 16.
‘Vaccines develop immunity against specific diseases’. Do you agree with this statement? Give reason. (2)
Answer:
Yes, Vaccines act as antigens and help our body produce antibodies. These antibodies are retained in the body and later protect it from the pathogen responsible for the disease.
Question 17.
Observe the figure and answer the questions.
(a) Identify the parts denoted as A and B. (1)
(b) Name the hormones produced by A. (1)
Answer:
(a) A: Medulla of the adrenal gland
B: Cortex of adrenal gland
(b) Epinephrine (Adrenaline) & Nor Epinephrine (noradrenaline)
Question 18.
The main concepts of the theory of evolution are given below. Analyze them and answer the questions.
- Overproduction
- Struggle for existence
- Natural selection
- Origin of new species
(a) Which theory is mentioned here? (1)
(b) Who proposed this theory? (1)
Answer:
(a) The Theory of Natural Selection
(b) Charles Robert Darwin
Question 19.
Complete the illustration. (2)
Answer:
(A) Gigantism
(ii) Growth of bones of the face, jaws, and fingers.
(B) Dwarfism
(iii) Stunted growth of body
Question 20.
Some body activities are given below. Arrange them suitably in the given table. (2)
- Heartbeat increases
- Trachea contracts
- Production of saliva increases
- Peristalsis slows down
| Sympathetic System | Parasympathetic System |
Answer:
| Sympathetic System | Parasympathetic System |
| Heartbeat increases. | Trachea contracts. |
| Peristalisis slows down. | Production of saliva increases. |
Question 21.
Read the statement and answer the questions.
‘One person requires blood for a major surgery. Antigen A and Antigen B are identified in his blood’.
(a) What is the blood group of that person? (1)
(b) Everyone cannot receive blood from all blood groups. Why? (1)
Answer:
(a) AB
(b) When a foreign antigen reaches one’s blood it stimulates defense activity. Then, the antigen present in the donor’s blood and the antibody in the recipient’s blood react with each other to form a blood clot. Hence, everyone can’t receive blood from all blood groups.
Question 22.
Complete the table showing the determination of sex in human beings. (2)
(Hint: X and Y are sex chromosomes)
| X | X | |
| X | (a) XX (i) _____________ |
(b) _____________ (ii) Female |
| Y | (c) _____________ (iii) Male |
(d) XY (iv) _____________ |
Answer:
(b) XX
(i) Female
(c) XY
(iv) Male
3 scores for each question from 23 to 32.
Question 23.
Observe the figure. Identify and write the functions of the parts labeled as A, B, and C. (No need to draw a diagram) (3)
Answer:
A. Cerebrum:
- Centre of thought, intelligence, memory, and imagination.
- Evokes sensation.
- Controls voluntary movements.
B. Cerebellum:
- Coordinates muscular activities and maintains the equilibrium of the body.
C. Medulla Oblangata
- Controls involuntary actions like a heartbeat, breathing, etc.
Question 24.
Analyze the hint given in the box and answer the questions.
| It is caused by the uncontrolled division of cells and their spread to other tissues. |
(a) Which disease is mentioned here? (1)
(b) What are the causes of this disease? (1)
(c) Early diagnosis is crucial in the treatment of this disease. Why? (1)
Answer:
(a) Cancer
(b) Environmental factors, smoking, radiation, virus, hereditary factors.
(c) The disease may become complicated with the spread of cancer cells to other parts of the body through blood and lymph.
Question 25.
Rearrange the stages of sensing the smell as a flow chart. (3)
- Stimulate the olfactory receptors.
- Impulses reach the brain through the olfactory nerve.
- Aromatic particles enter the nostrils through inhaled air.
- Generate impulses.
- We experience smell.
- These aromatic particles dissolve in the mucus inside the nostrils.
Answer:
- Aromatic particles enter the nostrils through inhaled air.
- These aromatic particles dissolve in the mucus inside the nostrils.
- Stimulates the olfactory receptors.
- Generate impulses.
- Impulses reach the brain through the olfactory nerve.
- We experience smell.
Question 26.
Prepare a list of concepts to be included in a notice to build awareness of AIDS.
Hints:
- Spread (Any 2 Situations) (2)
- Do not spread (Any 1 Situation) (1)
Answer:
Spread:
- Through sexual contact with an HIV-infected person.
- From HIV-infected mother to fetus.
- By sharing the syringe needle used by an AIDS patient.
- By receiving blood or organs from an AIDS patient. (Any two)
Do not spread:
- By touch, shaking hands, coughing, sneezing.
- Bites of mosquitoes, house flies, etc.
- By staying together and sharing food.
- By using the same toilet.
- By bathing in the same pond. (Anyone)
Question 27.
Observe the figure and answer the questions.
(a) Identify the process. (1)
(b) Which are the white blood cells responsible for this process? (1)
(c) Identify the stage indicated as A in this figure. (1)
Answer:
(a) Phagocytosis
(b) Monocytes and Neutrophils.
(c) Phagocyte engulfs the pathogens in a membrane sac.
Question 28.
Complete the flow chart related to the sense of hearing. (3)
Answer:
(i) Auditory Canal
(ii) Tympanum
(iii) Ear Ossicles
(iv) Cochlea
(v) Auditory Nerve
(vi) Cerebrum
Question 29.
Read the statement and answer the questions.
‘Antibiotics are effective medicines. Even though their regular use creates many side effects.
(a) Are antibiotics effective against all communicable diseases? Why? (1)
(b) Mention any two side effects of antibiotics. (2)
Answer:
(a) No. Antibiotics are the medicines used to resist bacterial diseases.
(b) Regular use develops immunity in pathogens against antibiotics.
They destroy useful bacteria in the body.
They reduce the quantity of some vitamins in the body. (any two)
Question 30.
Analyze the information given in the box and answer the questions.
| Gland X → Hormone A → Reduces the level of Calcium in blood. Gland Y → Hormone B → Increases the level of Calcium in blood. |
(a) What is the normal level of calcium in blood? (1)
(b) Which are the hormones indicated as A and B? (1)
(c) How does the hormone A reduce the level of calcium in blood? (1)
Answer:
(a) 9 – 11 mg/100 ml blood
(b) A: Calcitonin
B: Parathormone
(c) Prevents the process of mixing calcium from bones to blood. Stores the excess calcium from blood to bones.
Question 31.
Make suitable pairs as shown in the model using the information given in box A and B. (3)
Model: Australopithecus afarensis – slender body
| A | Ardipithecus ramidus, Homo erectus, Homo habilis, Australopithecus afarensis |
| B | Contemporary to modern man, slender body Most primitive member of the human race, Ability to stand erect, made weapons from stones and bone pieces |
Answer:
- Ardipithecusramidus: The most primitive member of the human.
- Homoerectus: Ability to stand erect.
- Homohabilis: Made weapons from stones and bone pieces.
Question 32.
Observe the illustration and answer the questions.
(a) Identify this process. (1)
(b) Name A and B. (1)
(c) What is the role of B in this process? (1)
Answer:
(a) Gene Action/Protein Synthesis
(b) A: Ribosome; B: mRNA
(c) Carries information about protein synthesis from DNA to ribosome.
4 score for each question from 33 to 36.
Question 33.
Redraw the diagram of the neuron. Name and label the parts performing the following function.
(a) Receive impulses from adjacent neurons. (1)
(b) Carries impulses away from the cell body to outside. (1)
(c) Secretes neurotransmitter. (1)
Answer:
Question 34.
A table showing the blood glucose levels of four persons is given below. Analyse and answer the questions.
| Person | Glucose Level (mg/100 mL) |
| A | 108 |
| B | 210 |
| C | 52 |
| D | 74 |
(a) Identify the persons having normal glucose levels. (1)
(b) Which person is diabetic? (1)
(c) What is the cause of diabetes? (1)
(d) What are the main symptoms of diabetes? (1)
Answer:
(a) Person A & D
(b) Person B
(c) Decreased production of insulin due to the destruction of beta cells. The inability of cells to utilize the insulin produced.
(d) Increased appetite and thirst.
Frequent urination.
Presence of glucose in urine.
Question 35.
Hints of two diseases are given below. Analyze them and answer the questions.
| A | Bacterial disease, loss of body weight, fatigue, persistent cough. |
| B | In genetic disease, excess blood is lost even through minor wounds. |
(a) Identify the diseases A and B. (1)
(b) In the case of disease B, how can a temporary relief be brought in? (1)
(c) Name the bacteria that cause disease A. (1)
(d) How does the disease A get transmitted from person to person? (1)
Answer:
(a) A: Tuberculosis
B: Haemophilia
(b) Identifying the deficient protein and injecting it.
(c) Mycobacterium tuberculosis.
(d) When the patient coughs or sneezes pathogen spreads into the air and thereby to others.
Question 36.
Observe the diagram and answer the questions. (No need to draw the diagram)
(a) Identify and name the parts A, B, C and D. (2)
(b) Write the functions of A and D. (2)
Answer:
(a) A: Cornea
B: Iris
C: Yellow spot
D: Optic nerve
(b) A: Cornea: Refracts light rays to focus on the retina.
D: Optic Nerve: Transmits impulses from photoreceptors to the visual center of the brain.