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Kerala Syllabus Class 10 Biology Board Model 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 four questions from 1 to 6. Each carries 1 score. (4 × 1 = 4)
Question 1.
Which of the following statements is related to mucous membranes? (1)
(a) Keratin is Present
(b) Sebum makes it Oily
(c) Cilia Cells Present
(d) Sweat Glands Present
Answer:
(c) Cilia Cells Present
Question 2.
Nitrogen bases in DNA are given below. Make them into suitable pairs.
(Adenine, Thymine, Guanine, Cytosine)
Adenine: ______________
Guanine: ______________
Answer:
Adenine: Thymine
Guanine: Cytosine
Question 3.
If there is a mistake in the underlined portion, correct it.
(a) Leptospira is the pathogen that causes Diphtheria. (1)
(b) Rat fever is a bacterial disease. (1)
Answer:
(a) Leptospirosis (Rat Fever)
Question 4.
Complete the illustration according to the model given below. (1)
Answer:
Bombycol
Question 5.
Some of the stages in the production of Insulin through genetic engineering are given below. Identify the step labeled as B. (1)
Answer:
Joining human insulin gene with bacterial DNA (Plasmid).
Question 6.
Identify the word pair relation and complete the following: (1)
Rod Cells: Rhodopsin
Cone Cells: ________________
Answer:
Photopsin or Iodopsin
(B) Answer all questions from 7 to 9. Each carries 1 score. (3 × 1 = 3)
Question 7.
Find out the odd one and write the common feature of others. (1)
| Glycogen is Converted to Glucose, the Trachea Expands, the Pupil Dilates, Production of Saliva Increases. |
Answer:
Production of saliva increases. Others take place under the control of the sympathetic system.
Question 8.
Write the function of the part labeled as A in the figure. (1)
Answer:
A – Semicircular Canals: Balancing of the Body.
Question 9.
Complete the illustration related to the evolution of human beings. (1)
Answer:
Hominoidea
Part – II
(A) Answer the following question. Carries 2 scores. (1 × 2 = 2)
Question 10.
Analyze the statement and answer the questions given below.
“Treatment using genetic engineering triggered great hope in the control of genetic diseases”.
(a) What is this method of treatment called? (1)
(b) What is the specific feature of this method of treatment? (1)
Answer:
(a) Gene therapy.
(b) Gene therapy is the method of curing genetic diseases by removing disease-causing genes from the genome and inserting normal functional genes.
Answer any one question from 11 to 12. Each carries 2 scores. (1 × 2 = 2)
Question 11.
Complete the table related to human chromosomes suitably. (2)
| Total Number of Chromosomes | (a) ______________ |
| (b) ______________ | 44 |
| Sex Chromosomes | 2 |
Answer:
(a) 46
(b) Somatic Chromosomes
Question 12.
“There is a common ancestor for all the different species that exist today”.
Write any two pieces of evidence which support the above statement from Biochemistry and Physiology. (2)
Answer:
- Enzymes control the chemical reactions of all organisms.
- Energy is stored in ATP molecules.
- Genes are the hereditary factors.
- Carbohydrates, proteins, and fats are the basic substances. (any two)
Part – III
(A) Answer any three questions from 13 to 16. Each carries 3 scores. (3 × 3 = 9)
Question 13.
Observe the figure of synapse and answer the following questions.
(a) Which synapse is shown in the figure? (1)
(b) What is a synapse? (1)
(c) Name the chemical substance which is secreted from the part labeled as x. (1)
Answer:
(a) Synapse in between neuron and gland cell.
(b) Synapse is the junction between two neurons or a neuron and a muscle cell or a neuron and a glandular cell.
(c) Acetylcholine/Dopamine (Neurotransmitters)
Question 14.
Analyze the part of the pamphlet and answer the questions.
| The disease can be transmitted by sharing needle and syringe contaminated with HIV components |
(a) Identify the disease mentioned in the pamphlet. (1)
(b) How does this disease affect the immune system of the body? (2)
Answer:
(a) AIDS (Acquired Immuno Deficiency Syndrom)
(b) HIV enters the body and multiplies using the genetic mechanism of lymphocytes. Hence the number of lymphocytes decreases considerably and reduces the immunity of the body.
Question 15.
Analyze the statement and answer the questions.
“The normal level of glucose in the blood is 70-100 mg/100 ml. The level of glucose in the blood is maintained by the combined action of two hormones”.
(a) Which are the two hormones mentioned here? (1)
(b) How do these hormones regulate the level of glucose in the blood? (2)
Answer:
(a) Insulin and Glucagon
(b) When the level of glucose increases in blood:
- Insulin converts glucose into glycogen in the liver and muscles.
- Enhance the cellular uptake of glucose molecules.
(c) When glucose level decreases in the blood:
- Glucagon converts the glycogen stored in the liver to glucose.
- Synthesis of glucose from amino acids.
Question 16.
Some facts regarding lymphocytes are given below. Arrange them in the table giving suitable headings.
- Neutralize the toxin of the antigens.
- Destroy the cells affected by the virus.
- Destroy the bacteria by disintegrating their cell membrane.
- Destroy cancer cells.
- Destroy the pathogens by stimulating other white blood cells.
| B-lymphocytes | _______________________ |
| _______________________ | _______________________ |
| _______________________ | _______________________ |
| _______________________ | Stimulate other defense cells of the body. |
Answer:
| B- Lymphocytes | T- Lymphocytes |
| Neutralize the toxins of the antigens. | Destroy the cells affected by the virus. |
| Destroy the bacteria by disintegrating their cell membrane. | Destroy Cancer Cells. |
| Destroy the pathogens by stimulating other white blood cells. | Stimulate other defense cells of the body. |
(B) Answer the following question. Carries a 3 score. (1 × 3 = 3)
Question 17.
Complete the flow chart regarding sense of hearing suitably.
Answer:
(a) Auditory Canal
(b) Tympanum
(c) Ear Ossicles
(d) Cochlea
(e) Auditory Nerve
(f) Cerebrum
Part – IV
(A) Answer any two of the questions from 18 to 20. Each carries 4 scores. (2 × 4 = 8)
Question 18.
Analyze the information given in the box and answer the questions. (1)
|
(a) Which theory on the origin of life is proved through this experiment? (1)
(b) Name the scientists who conducted this experiment for the first time. (1)
(c) Briefly describe the experiment. (2)
Answer:
(a) Chemical evolution theory.
(b) Stanley Miller and Harold C. Urey
(c) Urey and Miller artificially recreated the atmosphere of primitive earth that contained methane, ammonia, hydrogen, and water vapour, etc. with the help of a large glass flask in the laboratory, high voltage electricity was passed through the gaseous mixture in the glass flask. Then, this gaseous mixture was cooled with the help of a condenser. The sedimented substances were separated and when observed organic molecules such as amino acids were found.
Question 19.
Observe the illustration and answer the questions.
(a) Identify the process illustrated here. (1)
(b) What does X and Y indicate? (2)
(c) What is the role of transfer RNA in this process? (1)
Answer:
(a) Protein Synthesis/Gene Action
(b) X = mRNA forms from DNA
Y = Based on the information in mRNA, protein is synthesized by adding amino acids.
(c) tRNA brings different kinds of amino acids to ribosomes.
Question 20.
Analyze the figure and answer the questions.
(a) Identify the disease. (1)
(b) What is the cause of this disease? (1)
(c) How does the deformity of red blood cells affect the patient’s body? (2)
Answer:
(a) Sickle Cell Anaemia.
(b) The defects in genes may also cause deformities in the sequencing of amino acids which are the building blocks of hemoglobin.
(c) The oxygen-carrying capacity of red blood cells decreases. The sickle-shaped RBCs aggregate in the blood vessels and block the flow of blood in them.
(B) Answer any one question from 21 to 22. Each carries 4 scores. (1 × 4 = 4)
Question 21.
Different processes involved in inflammatory response are given below.
- White blood cells reach the wound site through the walls of the capillaries.
- Chemicals are produced.
- White blood cells engulf and destroy germs.
- Germs enter through wounds.
- Blood capillaries dilate.
(a) Arrange the processes involved in inflammatory response in sequential order. (2)
(b) Name the white blood cells involved in this process. (1)
(c) What is the advantage of dilation of the capillaries at the wound site? (1)
Answer:
(a) Germs enter through wounds, .
Chemicals are produced.
Blood capillaries dilate.
White blood cells reach the site through the walls of the capillaries.
White blood cells engulf and destroy germs.
(b) Monocytes and neutrophils.
(c) Dilate the capillaries thereby increasing the blood flow. Blood plasma and more white blood cells reach the wound site.
Question 22.
Analyze the information given in the box and answer the questions.
| (A) The water-like fluid provides oxygen and nourishment to the tissues of the eye. |
| (B) The jelly-like fluid seen in the chamber between the retina and the lens. |
(a) Identify the fluids (A) and (B). (1)
(b) How fluid (A) is formed? (1)
(c) Name the eye disease related to the fluid (A). (1)
(d) What is the function of fluid (B)? (1)
Answer:
(a) A = Aqueous humor
B = Vitreous humor
(b) Formed from blood.
(c) Glaucoma
(d) Helps in maintaining the shape of the eye.
Part – V
(A) Answer any one question from 23 to 24. Each carries 5 scores. (1 × 5 = 5)
Question 23.
Redraw the diagram identify and label the parts given below.
Redrawing
(a) Longest filament from the cell body. (1)
(b) Secretes neurotransmitter. (1)
(c) Part that receives impulses from adjacent neurons. (1)
(d) Carries impulses to the cell body. (1)
Answer:
Question 24.
Complete the table relates to plant hormones and their functions. (5)
| (a) ______________ | Auxin | (d) ______________ | Ethylene |
| Sprouting of Leaves | (b) ______________ | Falling ripened leaves and fruits | (e) ______________ |
| (c) ______________ |
Answer:
(a) Gibberellin
(b) & (c) Cell growth/cell elongation/fruit formation, promoting the growth of terminal bud. (any two)
(d) Abscisic Acid
(e) Ripening of leaves and fruits/Excess amount of ethylene causes dropping of leaves and fruits. (anyone)