Reviewing solved Biology Class 10 Kerala Syllabus Question Paper Set 5 English Medium helps in understanding answer patterns.
Biology Class 10 Kerala Syllabus Model Question Paper Set 5
Time: 1 ½ Hours
Total Score: 40
Instructions:
- The first 15 minutes is cool-off time.
- This time can be used for reading the questions and planning the answers.
- Write answers only according to the instructions and questions.
- While writing the answers, consider the score and time.
Questions from 1 to 4 carry 1 score each. (4 × 1 = 4 scores)
Question 1.
A portion of DNA molecule is shown below. Find out the missing nitrogen base pair from those given below.
(a) T — G
(b) G — C
(c) G — A
(d) A — C
Answer:
(b) G — C
Question 2.
Examine the statement and reason and select the correct answer.
Statement: Water balance is maintained by the action of a hormone called vasopressin or antidiuretic hormone
Reason: Vasopressin is stored in the posterior lobe of the pituitary gland
(A) Both the statement and the reason are correct. The reason is the correct explanation of the state¬ment.
(B) Both the statement and the reason are correct. The reason is the wrong explanation of the state-ment.
(C) Statement is correct. Reason is wrong.
(D) Statement is wrong. Reason is correct.
Answer:
(B) Both the statement and the reason are correct. The reason is the wrong explanation of the state-ment.
Question 3.
Choose the correct answer:
Statement 1: The first link in the human evolutionary series is Astralopethecus
Statement 2: Fossils of Sahelanthropus tchadensis have been excavated from Germany
(a) Statement I and 2 are correct
(b) Statement 1 and 2 are wrong
(c) Statement 1 is correct, statement 2 is wrong
(d) Statement 1 is wrong, statement 2 is correct
Answer:
(b) Statement 1 and 2 are wrong
Question 4.
Find the correctly matched pair from the given answers.
| (A) Acromegaly | (i) Excessive secretion of thyroxine |
| (B) Diabetes rnellitus | (ii) deficiencyofiodine |
| (C) Goitre | (iii) The production of somaotropin increases after growth phase |
| (D) Hyperthyroidism | (iv) The destruction of beta cells. |
(a) A:i, B:ii, C:iii, D:iv
(b) A:iii, B:i, C:iv, D:ii
(c) A:iii, B:iv, C:ii, D:i
(d) A:iv, B:i, C:iii, D:ii
Answer:
(c) A:iii, B:iv, C:ii, D:i
Questions from 5 to 11 carry 2 scores each. (7 × 2 = 14 Scores)
Question 5.
A. Observe the picture and answer the questions given below.
(a) Identify the genetic processes responsible for variations.
(b) What are the causes of this process?
Answer:
(a) Mutation
(b) Mutations can be caused by errors during DNA replication, exposure to certain chemicals, radiations, etc
OR
B. Arrange the following statements suitably in the table given below,
(a) Combine amino acids to make protein.
(b) tRNAs carry specific amino acids to the ribosome.
(c) mRNA is formed.
(d) mRNA that has reached the ribosome
| Transcription | Transcription |
Answer:
| Transcription | Translaion |
| (c) mRNA is formed. | (a) Combine amino acids to make protein. (b) tRNAs carry specific amino acids to the ribosome. (d) mRNA that has reached the ribosome |
Question 6.
Arrange the following statements suitably in the table given below.
(a) Receptors in skin.
(b) Receptors help in vision.
(c) Receptors help in taste.
(d) Receptors internal organs.
| Help to detect general senses | Help to recognise specific senses |
Answer:
| Help to detect general senses | Help to recognise specific senses |
| (a) Receptors in skin. | (b) Receptors help in vision. |
| (d) Receptors internal organs. | (c) Receptors help in taste. |
Question 7.
The picture shows a disease characterised by swelling of the lymph vessels in the legs due to obstruction of lymph flow.
a) Write the name of the disease and the pathogen
b) Suggest a way to prevent the spread of this disease.
Answer:
a) Filariasis – filarial worms
b) Mosquito control. People with this disease should avoid mosquito bites.
OR
B) The peculiarity of a disease is given below.
The protozoan named Plasmodium is the patho¬gen. Female Anopheles mosquito transmits this pathogen from one person to another.
a) Identify the disease.
b) Write the symptoms of this disease?
Answer:
(a) Malaria
(b) Intermittent fever, chills and shivering, head ache, vomiting, muscular pain, body pain and fatigue are the symptoms.
Question 8.
Choose the right statement from those given below:
i) Gene mapping is a technology that identifies the location of a gene in the DNA.
ii) The sum of genetic material present in an organism is called its DNA.
iii) Enzyme Ligase is used to join the genes.
iv) Gene therapy is the technology that tests the arrangement of nucleotides.
Answer:
i) Gene mapping is a technology that identifies the location of a gene in the DNA.
iii) Enzyme Ligase is used to join the genes.
Question 9.
Observe the illustration and answer the questions given below.
(a) Explain the diversity of finch’s beak
(b) Cause of diversity of beaks in finches.
Answer:
(a) There are about fourteen different species of finches in the Galapagos Islands. Some of them are ground finches, cactus finches, and tree finches.The main difference between these spe-cies is the shape and size of their beaks. The beaks of medium sized seed-eating finches are different from those of large seed-eating finches and insect-eating finches.
(b) The beaks are the main means of obtaining food.
Question 10.
Complete the flow chart related to the various stages of stem-cell therpy. The stem cells that produce blood cells are collected. – ___ (a)___ – ___ (b)___
Answer:
(a) The active gene is incorporated into the stem cells using viruses as vectors.
(b) The stem cells incorporated with the gene are injected to the patient.
Question 11.
Vipin wrote the following as situations that create variations in organisms. Choose the right ones.
a) Mutation
b) Formation of mRNA
c) Crossing over of chromosomes
d) Action of rRNA
Answer:
a) Mutation
c) Crossing over of chromosomes
Questions from 12 to 17 carry 3 scores each. (6 × 3 = 18 scores)
Question 12.
Write the difference between – Incomplete Domi-nance, Polygenic inheritance
Answer:
Incomplete Dominance : A dominant allele cannot fully hide the allele of the recessive trait.
Example – If a red flowered four o’clock plant is hybridised with a white flowered plant, the resulting offspring will have pink flowers.
Polygenic inheritance : More than one gene controls the colour of the skin. The action of these genes cause variation in the production of melanin that causes difference in skin colour.
Example – Difference in skin colour.
Question 13.
Complete the table related to Genetically Modified Organisms.
| Characteristics | Examples |
| Pest resistance | ___(a)___ |
| ___(b)___ | Soya bean |
| Nutrient – enriched | ___(c) ___ |
Answer:
(a) Bt. Cotton
(b) Weedicide resistance
(c) Golden rice
Question 14.
A. What is the normal level of glucose in blood? How is this level maintained?
Answer:
The normal level of glucose is 70-110 mg/ 100 ml blood. The level of glucose in blood is maintained by the combined action of insulin and glucagon of the Islets of Langerhans tissues of the pancreas.Insulin, released from the beta cells of Islets of Langerhans, helps to reduce blood sugar by accelerating the process of cellular uptake of glucose and conversion of glucose in to glycogen. When blood glucose level falls, glucagon, released from the alpha cells of Islets of Langerhans, converts glycogen to glucose and synthesizes glucose from amino acids.
B. Given below is the blood test result of a person. Analyse the result and answer the following questions?
Glucose – 200mg/ 100ml Calcium -11 mg/ 100ml
a) Name the disease of the man mentioned in the test report.
b) Write down the name of hormone which related to this disease.
c) What is the cause of this disease.
Answer:
a) Diabetes mellitus
b) Insulin
c) It is caused either by the decreased production of insulin or its malfunctioning.
Question 15.
Some of the defence mechanisms in plants are given below:
a) Callose
b) Cuticle
c) Bark
How do each of them help in defence?
Answer:
i) Callose prevents germs that have crossed the cell wall from entering the cell membrane.
ii) Cuticle prevents the entry of germs through leaves.
iii) Bark protects the inner cells from direct contact with pathogens.
Question 16.
Fever is the condition that occurs when the body temperature rises above the normal range .
a) What is the normal body temperature?
b) What is the cause of rise in body temperature?
c) What is the advantage of the rise in body tem-perature?
Answer:
a) 98.6° For 37°C).
b) When infection or inflammation occurs, white blood cells release chemical substances called pyrogens. These trigger the brain to raise the body temperature.
c) Fever is a kind of immune mechanism. High tem-perature helps phagocytes to destroy pathogens more quickly by engulfing them, inhibit the growth of pathogens, and enhance immunity
Question 17.
A. The flow chart given below indicates the transmis¬sion of impulse from one neuron to another. Complete the flow chart using the data given in the box.
Answer:
Dendron, B. Cell body, C. Axon, D-Axonite, E-Synaptic knob, F – Neurotransmitter
OR
B. Analyse the illustration of impulse transmission through axon and answer the following questions.
(a) What are the changes that take place in illustration B when compared to A? Give reason for this change.
(b) Explain how this change brings about the transmission of impulses through axon.
Answer:
(a) When stimulated, ionic equilibrium in the particular part changes, and the outer surface of the plasnia membrane of axon becomes negatively charged while the inner surface becomes positively charged.
(b) These changes generate impulses. The momentary charge difference in the axon stimulates its adjacent parts. Similar charges occur there also and impulses get transmitted through the axon.
The 18th question carries 4 scores (1 × 4 = 4 scores)
Question 18.
A. Redraw the diagram and label the parts that perform the following functions:
a) The tissues in the eye receive nutrients and oxygen.
b) Regulares the amount of light entering the eye.
Answer:
a) Choroid layer
b) lris\pupil
OR
B. Analyse the illustration related to the power of accommodation of the eye and answer the quesions.
a) Which figure indicates the change in the lens while viewing distant objects?
b) Give the reason for the change in the curvature of the lens in figure II than in figure 1.
Answer:
a) Figure 1
b) • While viewing nearby objects
• Ciliary muscles contract
• Ligaments relax, so curvature of lens increases.