Kerala SSLC Biology Previous Question Papers with Answers 2017 are part of Kerala SSLC Biology Previous Year Question Papers with Answers. Here we have given Kerala SSLC Biology Previous Question Papers with Answers 2017.
| Board | SCERT |
| Class | SSLC Class 10 |
| Subject | Biology |
| Category | Kerala SSLC Previous Question Papers |
Kerala SSLC Biology Previous Question Papers with Answers 2017 Free Download English Medium
Time Allowed: 1 1/2 Hours
Maximum Marks: 40
Instructions
- First 15 minutes is given as cool offtime. This time is to be used for reading and understanding the questions.
- Write down answers for all questions based on scores and time specified for each.
- Answer only on the basis of instructions and questions given.
- 7 and 9 are questions haying choices, only one need to be answered.
Question 1:
Following are the sense organs seen in four different organisms. Name the sense organ seen in Shark. (1)
a. Eye spot
b. Ommatidia
c. Lateral line
d. Jacobson’s organ
Question 2:
“Human life is possible on earth only with the existence of many diverse ecosystem.” (3)
Analyse the statement and answer the following questions:
a. List any 2 human intervention that can cause extinction of organisms.
b. How extinction of other organisms affect human beings?
Question 3:
a. Analyse the complete the table showing plant hormones and their functions. (2)
| Hormone | Function |
| Cytokinin | …. (i) …. |
| …. (ii) … | Gaseous hormone helps in the ripening of fruits |
| ….. (iii) | Breaks up stored food by stimulating production of enzyme during seed germination. |
| Abscisic acid | ….. (iv) …… |
b. Name the artificial hormone which is used as a weedicide. (1)
Question 4:
Now a days cancer is one of the most dreaded diseases in the world. (3)
a. List any four reasons for transformation of normal cells to cancer cells.
b. What are the methods used for the treatment of Cancer?
Question 5:
Phagocytosis is a process of engulfing and destroying germs. (3)
a. Prepare a flowchart showing the phagocytosis of a pathogen using the following hints:
Hints:
i. Engulf pathogen in membrane sac.
ii. The enzymes in lysosome destroys pathogen.
iii. Membrane sac combines with the lysosome.
iv. Phagocytes reach near pathogen.
v. Expels the remnants.
b. Name the two phagocytes seen in our blood.
Question 6:
During a discussion in a biology class, some students argued that it is not fair to critisize a mother for delivering female children only. Substantiate your answer scientifically with the help of an illustration. (2)
Question 7:
A. A debate is to be conducted in the class about “Genetic engineering – its beneficial and harmful effects.” (3)
a. Write two beneficial and two harmful effects of genetic engineering.
b. Name the enzymes used as genetic scissors and genetic glue.
OR
B. DNA finger printing is an important technique in the field of Genetic engineering. (3)
a. Name the person who proposed this technique.
b. List the uses of DNA finger printing.
Question 8:
Observe the illustration given below. These birds paved the way to formulate the theory of natural selection by Charles Darwin. (2)
IMG
a. What are the peculiarities of these birds which help in the formulation of the theory?
b. How this peculiarity helps these birds in their survival?
Question 9:
(A) Observe the given figure and answer the following questions:
a. Which activity of the body is represented by the figure?
b. Prepare a flowchart showing the path of this activity.
OR
(B) Following are causes of 2 diseases in connection with nervous system:
a. Name the diseases A and B.
b. Write 2 symptoms each for the diseases.
Question 10:
Auditory canal of ear is lined with small hairs and wax. Write the significance of these hair and wax in auditory canal. (1)
Question 11:
“The increase or decrease in hormones’ adversely affects body activities.”
Analyse and evaluate the above statement based on the following figures.
(Hints- Causes, Symptoms )
Question 12:
Complete the chart showing Viral diseases. ns mode of transmission and its examples. (1)
Question 13:
Group A shows some diagnostic equipments for the detection of diseases and Group B shows their uses. Prepare any four matching pairs using the items from Group A and Group B. (2)
Question 14:
Observe the illustration and answer the questions:
a. Name the process mentioned here.
b. List down the steps involved in this process in correct sequence.
Question 15:
In synapse the ends of neurons are not in close contact. Then how impulses are transmitted through a synapse. (2)
Question 16:
Copy the figure. Identify and label the parts based on the hints given and write one function of each. (4)
a. Slightly projected transparent anterior part of Sclera.
b. Part of retina where plenty of photoreceptors are seen. .
c. The aperture seen at the centre of Iris.
Answers
Answer 1:
Lateral line
Answer 2:
a. Deforestation, Environmental pollution,
b. Extinction of organisms effect the food chain. Human are affected badly because each species in a food chain are inter con-nected. If any one of the tropic level is destructed it can effect the organism in the food chain directly or indirectly. Since man is a part of the chain, any change in the food chain will affect man.
Answer 3:
a. (i) Promotes cell division, cell growth and cell differentiation.
(ii) Ethylene
(iii) Gibberellins
(iv) Controls dormancy of embryo in the seed, dropping of leaves and fruits, flowering,wilting of leaves etc.
b. 2,4-D ( 2,4-Dichloro phenoxy acetic Acid)
Answer 4:
a. Various reasons such as environmental factors, smoking, radiations, hereditary factors and alterations lead to the transformation of normal cells into cancer cells,
b. Surgery, Chemotherapy, Radiation therapy etc.
Answer 5:
a. Phagocytes reach near pathogens → Engulf pathogen in membrane sac → A Membrane sac combines with lysosome → The enzymes in lysosome destroys the pathogens → Expels the remnants,
b. Monocytes and Neutrophils.
Answer 6:
Sex chromosomes are different. XX in female and XY in male. The XY chromosomes of father determines whether the child is male or female. There is 50:50 possibility to have a boy or girl child.
Answer 7:
(A) a. Beneficial effects of Genetic Engineering
- Plants and animals that produce medicines.
- Remedy for genetic diseases.
Harmful effects of Genetic Engineering
- Genetically modified varieties cause harm to indigenous varieties and may cause health issues to humans,
- Application of genetically modified pathogens and pathogens multiplied through biotechnology upon enemies is called Biowar.
b. Genetic Scissors – Restriction Endonuclease, Genetic glue – Ligases.
(B) a. Alec Jeffrey
b.
- Helpful to find out hereditary characteristics.
- To identify real parents in cases of parental disputes.
- To identify persons found after long periods of missing due to natural calamities or wars.
Answer 8:
a. Though the finches look similar to one another they had differences in their beaks.
b. Finches have beaks according to their food habits. Insectivorous finches have small beaks and those that feed on cactus plant have long and sharp beaks. Wood peckers that feed on worms from holes in tree trunks using small twigs taken with its finches have sharp beaks and the ground finches that feed on seeds have large beaks.
Answer 9:
(A)a. Reflex action
b. Stimulus → Sensor Neuron → Intemeuron → Motor neuron Related Muscle.
(B) a. A- Alzheimer’s B- Parkinsons
b. Alzheimer’s -Loss of memory, inability to recognize friends and relatives.
Parkinsons – Loss of body balance, shivering of the body.
Answer 10:
Small hairs and wax inside the canal help to prevent dust and foreign particles from entering the ear.
Answer 11:
The deficiency of thyroxine during foetal stage or infancy leads to mental retardation and stunted growth. This condition is called cretinism. The excessive production of thyroxine, leads to hyperthyrodism may lead to grave’s disease characterised by bulging of eyeballs. Flence the increase or decrease in hormones adversely affects the bodily activities.
Answer 12:
A – Chicken pox
B – AIDS
C – Through mosquitoes
D – Through Animals.
Answer 13:
EEG – Records electric waves in Brain
CT Scanner – Get 3D visuals of internal organs with help of computer using X – rays ECG- Records electric waves in heart much Ultrasound Scanner – Understands the structure of internal organs using Sound waves. MRI Scanner – Gets 3-D visuals of internal organs.
Answer 14:
a. Protein Synthesis
b.
- mRNA forms from DNA
- mRNA reaches outside the nucleus
- mRNA reaches ribosomes
- Different kinds of amino acids reach ribosomes.
- Based on the information in mRNA protein is synthesized adding amino acids.
Answer 15:
The electric impulses generated by stimuli reach the synaptic knob where certain chemical substances are secreted. They are called neurotransmitters. The neurotransmitter which is released in the synaptic cleft stimulates the adjacent dendrite and new electric impulses are formed.
Answer 16:
a. Cornea – Refracts light rays to focus on the retina.
b. Yellow spot – Part of the retina were plenty of photoreceptors are seen. Point of maxi-mum visual clarity.
c. Pupil – Adjusts its size according to the intensity of light.
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