Kerala SSLC Biology Model Question Papers with Answers Paper 3

Kerala SSLC Biology Model Question Papers with Answers Paper 3 are part of Kerala SSLC Biology Previous Year Question Papers with Answers. Here we have given Kerala SSLC Biology Model Question Papers with Answers Paper 3.

Kerala SSLC Biology Model Question Papers with Answers Paper 3 Free Download English Medium

Time Allowed: 1 1/2 Hours
Maximum Marks: 40

Instructions

1. First 15 minutes is given as cool off time. This time is to be used for reading and understanding the questions.
2.  Answer only on the basis of instructions and questions given.
3. Consider score and time while answering.

Answer any 5 questions from Q.No. 1 to 6. Each questions carries 1 score. 5×1 = 5

Question 1:
Which of the following is not a part of modem genetic engineering?
a. DNA profiling .
b. Gene mapping
c. DNA finger printing
d. X-ray diffraction

Question 2:
Find out the correct pair from the following.
a. Lamarak – Chemical evolution
b. Darwin – Natural selection
c. Oparin – Acquired characters

Question 3:

Question 4:
Given below are the functions created to vagus nerve. Read carefully and select the wrong statements.
a. Increase the secretin of saliva
b. Trachea enlarges
c. Heart beat increases
d. Increase the working of stsomach of intestine

Question 5:
Complete the illustriation using the words given in the box.

(Calcitonin, Parathormone, Thyroxine, Insulin)

Question 6:
Corret the word underlined in the given statements. If there is any mistake.
a. The peripheral nervous system consists of the brain and the spinal cord.
b. The brain is protected inside the vertebral column and is covered by meninges.
c. Spinal cord is the main centre of reflex action.

Answer any 6 questions from Q.No. 7 to 13. Each question carry 2 score. 6×2=12

Question 7:
Rahul co ntr acted tuberculosis. He did not get cure by treatment. Later he got herpes infection and also fungal iinfection in his nose and mouth.
a. Identi fy the disease in this person.
b. Assess the peculiar characteristics of this diseases.

Question 8:
Complete the flow chart given below.

Question 9:
DNA does not participate directly in protein synthesis. Illustrate the process of protein synthesis with the help of flow chat given below.

Question 10:
What are the changes that occur in the ciliary muscles and eyelens, when a man who is reading a book, raises his head and looks at a distant object ?

Question 11:
Social insects such as Honey bees, termites etc, live in colonies due to the secretion of certain chemical substances , that act as chemical messengers.
a. What is the general name of these chemical substances ?
b. Give examples of two such chemical substances and the organisms that produces them.

Question 12:
Observe the figure indicating the positive and negative charges on either side of the plasma membrane of an axon. (2)

a. What is the reason for the formation of different charges on either side of the plasma membrane?
b. Due to stimulation, what change occurs in the ionic charges on either side of the plasma membrane? How is the potential difference transmitted as impulse through an axon?

Question 13:
a. Arrange in correct sequence on the basis of evolutionary relationship

b. Does human presence influence the process of evolution? Explain

Answer any 5 questions from Q. No. 14 to 20.

Question 14:
Rearrange columns B and C according to the coloumn A.

Question 15:
The health survey conducted in a village reported some patients, suffering from high fever, along with headache and shivering. Can you assume their diseases ?
a. For diagnosing the disease, what all symptoms are required ?
b. What all measures can be undertaken to prevent the spread of these diseases ?

Question 16:
Fill in the blanks, based on the major eras of the origin of earth and origin of life and evolution of life.
Origin of earth
Fromation of oceans
Chemical evolution
…………………..
Formation of genetic materials
………………..
Prokaryotes
………………….
Colony of eukaryotes
Formation of multicellular organisms.

Question 17:
Complete the table.

Question 18:
Differentiate hypothyroidism and hyperthyroidism using the features given below.

Question 19:
Given below is the hybridisation between two pea plants one with green colour and round seeds and the other with yellow colour and wrinkled seeds.


a. Write the alleles of the gametes formed while self pollinating the first generation.
b. Identify the new combination of characters that appear in the second generation.
c. What reason did Mendel give for the appearance of new combination of characters in the second generation?

Question 20:
Given below are certain communicable diseases.

a. Identify the diseases that are caused by fungi.
b. Why does the lymph ducts in the legs get swollen in persons infected with Filariasis?
c. Being responsible citizen, suggest two measures to prevent the spread of communicable diseases.

Answer any 2 questions from Q.no. 21 to 23. Each question carries 4 score. 2 x 4 = 8

Question 21:
Analyse the indications.
Name the parts of brain indicated and write the functions they perform.
a. Situated below the cerebrum
b. Situated just below the thalamus
c. Situated behind the cerebrum
d. Seen as rod-shaped structure near the cerebellum.

Question 22:
Observe the illustration and answer the questions below.

a. Complete the illustration.
b. Name the theory which is illustrated ?
c. Who put forward this theory ? Explain his findings with the help of suitable example.

Question 23:
Redraw the diagram of human eye. Name and label the following parts.

a. The fluid-filled chamber that gives shape to the eye.
b. The aperture at the centre of iris.
c. The inner most photosensitive layer of eye.

Answers

Answer 1:
d. X-ray diffraction

Answer 2:
b

Answer 3:
X- Hypothalamus

Answer 4:
b, c

Answer 5:
X- calcitonin
Y- Parathormone.

Answer 6:
1. The central nervous sysem consists of the brain and the spinal cord.
2. The spinal cord is protected inside the vertebral column and is covered be meninges.
3. No error

Answer 7:
a. The person has AIDS
b. HIV viruses that infect the body destroys the lymphocytes that provides immunity to our body. Hence the body becomes easily susceptible to many other diseases. Lack of immunity makes the AIDS patient susceptible to many diseases.

Answer 8:

Answer 9:
i. mRNA reaches outside the nucleus
ii. mRNA reaches ribosomes
iii. Different kinds of amino acids reach ribosomes
iv. Based on the information in mRNA protein is synthesized adding amino acids.

Answer 10:
The ciliary muscles are relaxed and the thickness of the lens decreases.

Answer 11:
a. Pheromones
b. Musk – Musk dear
Bombykol – Female silkworm Civetone – Civet

Answer 12:
a. The difference in the distribution of ions.
b. There is a negative charges on the outer surface of the plasma membrane of the neuron and positive charges on the inside. This charge difference in the axon membrane, stimulates its adjacent parts and impulses gets transmitted.

Answer 13:
a. Gibbon → Orangutan → Gorilla → Chimpanzee → Man
b. Molecular biology – Through a comparative study of protein molecules in different species, the evolutionary relationship among organisms can be identified. Due to the selfish interference of humans, the biodiversity is on a dangerous decline. There will be climate change, and mass extinction of different species. For the benefit of human being, we are destroying the environment and for the
c. utilisation of resources from plants and animals, we are causing extinction of plants and animals. Humans have the commonsense to realize in advance the impacts of environmental destruction.

Answer 14:

Answer 15:
Analysis of the symptoms identifies the disease as malaria or weil’s disease.
a. Symptoms of weil’s disease are headache, fever, shivering, body ache, reddness of eye, difficulty in looking at bright light.
Symptoms of Malaria are acute fever, cold and shivering, severe head ache, very high body temperature, fever along with shivering. Both malaria and weils disease have common symptoms.
Hence blood test alone can confirm the disease.
b. The pathogens of weils disease enter into water through the urine of infected rat. These pathogens enter human body through the wounds on the skin. So keep our surroundings very clean, wear slippers; Malaria is spread by female Anopheles mosquitoes. So control the multiplication of mosquitoes. Don’t allow the stagnation of water. Consult a doctor at
the very, beginning. Conduct awareness classes and keep the surroundings very clean.

Answer 16:
Origin of earth
Formation of oceans
Chemical evolution
Synthesis of complex molecules
Genetic materials
Formation of lipid layer
Prokaryotes
Eukaryotes
Colony of eukaryotes
Formation of multicellular organisms.

Answer 17:
a. Oxytocin helps in the contraction of the smooth muscles of the uterus, thereby helping in easy child birth. It helps in the secretion of breast milk.
b. Vasopressin or Anti diuretic hormone
(ADH)
c. Regulates body growth.

Answer 18:

Answer 19:
a. (GW) (GW) (gW) (gW)
b Green coloured wrinkled seed, yellow coloured round seed,
c. When two or more characterstics are inherited individual hereditary factors assort independently.

Answer 20:
a. Athletes Foot, Ringworm
b. The filarial worms infects the lymph duts and block the flow of lymph throughout the body. Hence the lymph ducts in the legs gets swollen in persons with filariasis.
c. Keep your home and surroundings clean. Avoid the stagnation of water. Observe dry day.

Answer 21:
a. Thalasmus – Relay station of impulses
b. Hypothalamus – Maintains homeostasis
c. Cerebellum – Maintains equilibrium of the body.
d. Medulla oplongata – Controls involuntary actions

Answer 22:
a. A. Struggle for existence
B. Those with favourable variations.
C. Deatroyed
D. Survives
E Favourable variations are transferred to the next generation.
F. Origin of new species

b. Theory of Natural selection
c. Darwin
Darwin observed differences in the beaks of the finches in the Galapagox island. Though, the finches were smilar in sound and nesting habit, they showed differences in beak and food habits, Insectivoures finches have small beaks, cactus feeding finches have long and sharp beaks etc. So, Darwin concluded that they evolved from commopn ancestors.

Answer 23:

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