Students can Download Kerala SSLC Biology Previous Year Question Paper March 2019 English Medium Pdf, Kerala SSLC Biology Model Question Papers helps you to revise the complete Kerala State Board New Syllabus and score more marks in your examinations.
Kerala SSLC Biology Model Question Paper 4 English Medium
Instructions :
- The first 15 minutes Is the Cool-off time.
- You may use the time to read the questions and plan your answers.
- Answer only on the basis of instructions and questions given.
- Consider score and time while answering.
Time: 1½ Hours
Total Score: 40 Marks
Section – A
Answer any five questions from Q.No. 1 to 6. Each carries on score. (5 × 1 = 5)
Sslc Biology Question Paper 2019 Question 1.
Identify the word pair relation and fill the blanks.
(a) Monkeys: Cercopithecoidea::
Chimpanzee: ………………..
(b) A.I.Oparin: Theory of chemical evolution::
Hugo de Vries: ………………….
Answer:
a) Hominoidea
b) Mutation theory
Sslc 2019 Biology Question Paper Question 2.
Find out the parts that are not related to retina from the following.
Answer:
Conjuctiva
Iris
Sslc Biology Question Paper 2019 Kerala Question 3.
“Myelin sheath accelerates the speed of impulses through axon and provides nutrition to it.”
(a) How does myelin sheath form?
Answer:
Myelin sheath is formed due to the repeated encir- * cling of Schwann cells around the axone.
Biology Sslc Question Paper 2019 Question 4.
Identify the relation in the Indicator (A) and complete (B) accordingly.
Answer:
i. Ribose Sugar
ii. AUGC.
Sslc Question Paper 2019 Kerala Question 5.
Find out the fungal diseases from the following: Malaria, Ringworm, Filariasis, Athelete’s foot
Answer:
Ring worm Athlete’s foot
Sslc Biology Chapter 1 Questions English Medium Question 6.
Complete the statement suitably:
“In …….(a)……………. the specialised part in pancreas two types of cells are found. Of these (b)……. cells produce insulin.”
Answer:
a) Islets of Langerhans
b) Beta cells
Answer any six questions from Q.No. 7 to 13. Each carries on score. (6 × 2 = 12)
Sslc Biology Previous Year Question Papers Question 7.
Make suitable pairs of different white blood cells and the function they perform.
Answer:
March 2019 Biology Question Paper Question 8.
Write the name of pathogens and symptoms of the given diseases:
Answer:
A: Malaria
Pathogens: Protozoa – plasmodium
Symptoms
- High fever with shivering
- Profuse sweating, severe headache
- Vomitting, diarrhoea, anemia
B: Tuberculosis
Pathogens: bacteria: Mycobacterium tuberculosis
Symptoms
- Loss of body weight
- Fatigue
- Continuous dry cough
Biology Question Paper 2019 Question 9.
- Excess blood is lost even though minor, injuries.
- Loss of body balance
- Accumulation of insoluble proteins in the neutral tissues of brain
- Production of dopamine reduces
- Irregular flow of electric charges in brain.
Answer:
Sslc English Previous Year Question Papers Question 10.
Observe the illustration and answer the questions.
(a) Name the Scientists who devised the experi-mental set up shown above.
(b) Which theory of evolution is substantiated by this experiment?
Answer:
a) Stanley L.Miller and Harold C.Urey
b) Theory of chemical evolution
12th Biology Question Paper 2019 State Board Question 11.
Observe the illustration and answer the questions.
Answer:
a. A: Genetic scissors: Restriction endonuclease
B: Genetic glue : Ligase
b. Yes
- They will have the ability to prouce insulin.
- They change that occured in the genetic constitution will be transferred to the next generation too. In case of mutation the gene might loss the capacity for the production.
Question 12.
List out the four major concepts to be included in a blood donation campaign.
Answer:
- Blood cannot be made artificially. So we can save life of a person by donating blood. So do-nate blood and save life.
- A healthy person can donate 300 ml of blood within a period of 6 months.
- If the level of blood decreases beyond a certain level, it may cause the death of the individual. During such situation for the sustenance of the life the blood donation by a person becomes inevitable.
- Before transfusion, blood group matching should be ensured.
Question 13.
Mutation cause variations in organisms. It leads to evolution of species:
(a) What is mutation?
(b) Explain two other factors that cause variations in organisms.
Answer:
a) A sudden heritable change in the genetic con-stitution of an organism is called mutation.
b) Crossing over in chromosomes
Answer any five from Q.No. 14 to 20. Each carries 3 score. (5 x 3 = 15)
Question 14.
Observe the illustration and answer the questions.
(a) Why do the forelimbs of these organisms show differences in external appearance?
(b) What inferences regarding evolution can be drawn from the anatomy of these organs?
(c) Write any two other scientific evidences which proves evolution.
Answer:
a) Difference in their external appearances are their adaptations to live in their own habitats.
b) Anatomical resemblances justify the interference that all organisms evolved from a common ancestor.
c) Biochemistry and Physiology, Molecular Biology and Evidence from fossils
Question 15.
Observe the illustration.
(a) What does R, r denote in the illustration
(b) Which character is expressed in first generation. Why?
Answer:
a) Gametes / Allele
b) Red Flower
Hybridization experiment, the allele that controls the dominant character (Red) that is expressed, and other character remains hidden (recessive character-white) in the offsprings of the first generation.
Question 16.
“Smoking harmfully affects internal organs.”
This is a general statement.
Explain how smoking affects brain, heart and lungs.
Answer:
a) Brain: Stroke, Addiction to nicotine
b) Lungs: Lung cancer, Bronchitis, Emphysema
c) Heart: Hypertension, loss of elasticity of arteries, Decrease in functional efficiency.
Question 17.
There are certain mistakes in the given chart. Find out and correct it.
Answer:
Question 18.
Analyse the statement and answer the questions. “Antibiotics, the miraculous medicines of 20th century helped a lot to bring many diseases under control. But the use of antibiotics without consulting doctor is not advisable.”
(a) Why antibiotics considered as miraculous medi-cines?
(b) Write two side effects of antibiotics.
Answer:
a) Antibiotics are drugs obtained from microorgan isms that are used to destroy the growth of other microorganisms that cause diseases. Antibiotics are biochemical substances extracted from living things like bacteria and fungi which can or prevent the spreading of germs. Antibiotics target microorganisms such as bacteria, fungi and parasites.
b) Side effects of antibiotics:
- Regular use develops immunity in pathogens against antibiotics.
- Destroys useful bacteria in body.
- Reduces the quantity of some vitamins, in body.
Question 19.
Correct mistakes if any in the underlined part of the given statements.
(a) Curvature of lens increases when viewing near objects.
(b) Vitreous humor is formed from blood, and is re-absorbed by blood.
(c) Membraneous labyrinth in the inner ear is filled with Perilymph.
(d) Eustachian tube amplifies and transmits the vi-brations of tympanum to the internal ear.
Answer:
(a) Curvature of lens increases when viewing near objects.
(b) Vitreous humor is formed from blood,and is re-absorbed by blood.
(c) Membraneous labyrinth in the inner ear is filled with endolvmph.
(d) Ear ossicles amplifies and transmits the vibration of tympanum to the internal ear.
Question 20.
Observe the figure and answer the questions:
(a) Identify the partsAand B.
(b) What is the function of ‘A’?
(c) Explain the process that takes place in ‘B’.
Answer:
a) A: mRNA B: Ribosome
b) mRNA:mRNA carries information from DNA to ribosomes and controls protein synthesis.
c) mRNA molecule that carries information from DNA to ribosomes.
mRNA reaches ribosomes. tRNA carry different kinds of amino acids to ribosomes.
Based on the information in mRNA protein is synthesized in ribosomes adding amino acids.
Answer any two from Q.No. 21 to 23. Each careries 4 score. (2 x 4 = 8)
Question 21.
Analyse the given informations related to plant hor mones and answer the questions.
(a) to increase the size of apple
(b) to prevnt dropping of premature fruits.
(c) to increase the production of latex.
(d) to enable flowering of pineapple plants at a time.
(i) Match hormones and their functions properly.
(ii) Write the name and function of any other two hormones occur naturally in plants.
Answer:
i) a) Gibberellins
b) Auxins
c) Ethyphon
d) Ethylene
ii)
| Plant hormones | Functions |
| Cytokinins | Promotes cell division, cell growth and differentiation along with auxin. |
| Abscisic acid | Control the dormancy of embryo in the seed. Control flowenng Helps to sustair the plant in adverse conditions |
Question 22.
Observe the illustration and answer the following questions.
(a) Name the cells (A) and (B).
(b) Explain the role of these cells in making vision possible.
(c) How impulses are generated in these cells when light rays fall on it?
Answer:
a) A. Rod cells B. Cone cells
| Photo receptors | Functions |
| Rod cells | Vision in dim light, black and white vision |
| Cone cells | Bright light vision, colour vision |
b) Working of the cone
When the light falls on cone cells, the photopsin, in them dissociate into retinal and opsin. This chemical change creates impulses.
Working of rod cells :
d cells the pigment rhodopsin in them dissociate into retinal and opsin. This chemical change creates impulses.
c) The sense of vision :
When the pigment photoreceptors dissociate, impulses are forrmed. When get the sense of vision, when these impulses reach the brain through optic nerve.
Question 23.
(a) Redraw the diagram.
Name and label the parts that perform the given functions.
(a) Relay station of impulses.
(b) Controls heartbeat, breathing etc.
(c) Maintains equilibrium of the body.
Answer:
a) Thalamus
b) Medulla oblongata
c) Cerebellum