Kerala Syllabus Class 10 Biology Model Question Paper Set 1

Reviewing solved Biology Class 10 Kerala Syllabus Question Paper Set 1 English Medium helps in understanding answer patterns.

Biology Class 10 Kerala Syllabus Model Question Paper Set 1

Time: 1 1/2 Hours
Total Score: 40

Instructions:

1. The first 15 minutes is cool-off time.
2. This time can be used for reading the questions and planning the answers
3. Write answers only according to the instructions and questions
4. While writing the answers, consider the score and time.

Questions from 1 to 4 carry 1 score each. (4 × 1 = 4 scores)

Question 1.
Analyse the assertion and reason and choose the correct answer.
Assertion: Acquired traits are not inherited
Reason: Spontaneous mutations do not change the genetic makeup of organisms.
(a) The assertion and reason are correct, and the reason is the correct explanation of the assertion.
(b) Assertion and reason are correct but reason is not the correct explanation of assertion
(c) Assertion is correct, reason is wrong
(d) Assertion is wrong, reason is correct
Answer:
(c) Assertion is correct, reason is wrong

Question 2.
Complete the statement. ……. is the membrane that covers the anterior part of the eye, including the eyelids except the cornea.
Answer:
Conjunctiva

Question 3.
Find the correctly matched pair from the given answers.

(a) A Blood group	(i) No antigen
(b) B Blood group	(ii) No antibody
(c) AB Blood group	(iii) Antigen A
(d) O blood group	(iv) Antibody a

(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

Question 4.
Which are the statements realted to Cone cell?
(i) cylindrical in shape
(ii) contain the pigment called photopsin.
(iii) are about 45 lakhs
(iv) Recognise objects in both dim light and in shades of black and white.
(a) i, ii, iii
(b) ii, iii
(c) ii, iii, iv
(d) i, iv
Answer:
(b) ii, iii

Questions from 5 to 11 carry 2 scores each. (7 × 2 = 14 scores)

Question 5.
A. Observe the figure and answer the questions given below.

(a) Identify the fossil.
(b) What is the evolutionary significance of this fossil?
Answer:
(a) Archaeopteryx
(b) possesses the characteristic features of both reptiles and birds. Fossils which are connecting links reveal the evolutionary relationship between organisms.

OR
B. Write the answer of the following statements related to human evolutionary path.
(i) Contemporaries of modem man.
(ii) Were able to walk upright on two legs.
Answer:
(a) Homo neanderthalensis
(b) Homo erectus

Question 6.
A. Symptoms of a disease is given below. Circular reddish rashes, itching
(a) Identify the disease, pathogen.
(b) What is the mode of infestation of this disease?
Answer:
(a) Ring worm, Fungus
(b) Through the infected persons, contact, contaminated objects and from animals.

OR
B. Symptoms of a disease is given below.
White patches in the mouth, itching
(a) Identify the disease, pathogen.
(b) What is the mode of infestation of this disease?
Answer:
(a) Candidiasis, Fungus
(b) Direct contact, through sharing of clothes, through sexual contact

Question 7.
How does the perception of darkness occur through the action of photoreceptors and bipolar cells?
Answer:
Glutamate acts as the primary neurotransmitter in photoreceptors. Variations in glutamate production are responsible for the perception of darkness and light. In the dark, photoreceptors continuously produce glutamate. On bipolar cells (those that sense light) 14. are inactivated and off bipolar cells (those that sense . darkness) are activated. Off bipolar cells that indi¬cate the absence of light form impulses that reach the brain through the optic nerve, creating a sense of darkness.

Question 8.
Complete the table

Equipment	Use
___(a)	It is used to measure the oxygen level in a person’s blood and their pulse rate without using a needle.
Endoscope	___(b)

Answer:
(a) Pulse oximeter
(b) Is used to look inside the body to examine inter¬nal organs or cavities without surgery.

Question 9.
Name the gland which seen at the centre of brain, write its function.
Answer:
Pineal gland, melatonin the hormone produces by this gland helps to maintain the rhythm of our daily ac¬tivities.

Question 10.
Observe the table given below and make the appropriate pairs.

(a) DNA Profiling	(1) Treatment for genetic diseases
(b) Gene mapping	(2) Testing the arrangement of nucleotides
(c) Gene therapy	(3) The sum of genetic materials present in an organism
(d) Genome	(4) Locating the position of a gene in the DNA

Answer:

(a) DNA Profiling	(2) Testing the arrangement of nucleotides
(b) Gene mapping	(4) Locating the position of a gene in the DNA
(c) Gene therapy	(1) Treatment for genetic diseases
(d) Genome	(3) The sum of genetic materials present in an organism

Question 11.
Numerous biological techniques have been developed to help conserve the ecosystems and biodiversity. Justify the statement (Hint: Cryopreservation, Bioremediation)
Answer:
Cryopreservation: This is the process of preserving living cells, tissues and organs at very low tempera¬tures (-196°C). It is used for long-term preservation in fields such as medicine, agriculture and research. Bioremediation: Uses microorganisms and plants to remove pollutants from contaminated environments such as soil, water and air. This converts the pollut-ants into harmless compounds.

Questions from 12 to 17 carry 3 scores each. (6 × 3 = 18 scores)

Question 12.
Analyse the given statement and answer the questions. “The basis of blood grouping is the presence of antigen A and antigen B in red blood cells”. According to this, how many blood groups are there in humans? Write the antigen and antibody of each group.
Answer:
There are four main blood groups in humans, based on the presence (or absence) of the A and B antigens.

Blood group	Antigen	Antibody
A	A	b
B	B	a
AB	AB	–
O	–	a, b

Question 13.
A. “Suma murder case-trace of hair obtained from the size of incidence enabled to identify killer”.
a) Read the above news.Name the technology that helped to find thefiller?
b) Cite two other uses of this technology.
Answer:
(a) DNA finger printing

(b) • to solved parental dispute
• to identify culprits
• to identify persons

B. Observe the picture and answer the questions given below.

(a) Identify the parts indicated as A, B, C, D.
(b) What is the role of the part indicated as D in the above process
Answer:
(a) A – Tongue,
B – Papilla,
C – Taste bud,
D – Chemoreceptors

(b) Microvilli from each chemoreceptor. reach the minute pores present in the papilla. Saliva enters through this pore. Substances that give rise to taste are dissolved in saliva and stimulate chemoreceptors. The impulses produced by these molecules in the chemoreceptors reach the brain through the nerve and make the sense of taste.

Question 14.
Observe the logo and answer the questions given below.

a) Write down the climate B and C
b) Analyse the difference shown in B and C and write down its reasons.
c) Which hormone is responsible for the excreation of excess water through urine.
Answer:
(a) Human Microbiome Project (HMP)

(b) The number of microorganisms in our body is ten times more than the cells. They provide us many services,, including immunity, digestion, and the production and absorption Of vitamins. To develop knowledge about those, the Human Microbiome Project (HMP) was launched.

(c) HMP proved that the human body is not only composed of cells but also crores of microor-ganisms and their co-existence is essential for our well being. It also revealed that the cause of disease is not only the pathogen but the change in the equilibrium of microorganisms in the body. This knowledge has opened new avenues for diagnostic and treatment methods. This project opened a great opportunity to design personalised medicine and to arrange treatment according to each individual’s microbiome.

Question 15.
A. The quantity of urine excreted by a person in different seasons is given below. Analyse it and answer the following questions.

a) Write down the climate B and C
b) Analyse the difference shown in 13 and C and write down its reasons.
c) Which hormone is responsible for the excreation of excess water through urine.
Answer:
a) B – Rainy season or winter season,
C – Summer season

b) In rainy season production of vassopressin is less it decreases the reabsorbtion of water in the kidneys. So raises the quantity of urine. In summer season production of vasopressin increases. It increases the reabsorbtion of water in kidneys and lowers the quantity of urine.

c) ADH or vasopressin

OR
B.Choose the correct pairs related to the eye defects from the pairs given below.
a) Cataract – Reabsorption of aqueous humor does not occur
b) Glaucoma – Rectified by Replacing the lens
c) Colour blindness – Infection of conjunctiva
d) Cataract – Lens of the eye becomes opaque
e) Conjunctivitis – Rectified by Laser surgery
f) Glaucoma – Rectified by Laser surgery
g) Colour blindness – Inability to distinguish colours
Answer:
Correct pairs
d) Cataract – Lens of the eye becomes opaque
f) Glaucoma – Rectified by Laser surgery
g) Colour Blindness – Inability to distinguish colours

Question 16.
The result of a survey conducted by the Health Department on mosquito borne diseases is shown in the graph. Analyse the graph and answer the questions.

a) Which disease affects more number of people?
b) Write symptoms of the disease B.
c) Suggest suitable measures to prevent the spread of the diseases shown in the graph.
Answer:
a) Filariasis (Filarial worm).
b) Fligh fever with shivering, profuse sweating, headache, vomiting, diarrhoea, anaemia, etc.
c) Dengue fever. Malaria, and Filariasis are the diseases spread by mosquitoes. Therefore, avoid circumstances that lead to the spread of mosquitoes. Observe ‘Dry Day’ once in two weeks, keep our surroundings clean, and practice the use of measures like mosquito nets.

Question 17.
‘DNA fingerprinting and gene mapping are two important branches of biological technology. These technologies help in analysing the unique genetic information in DNA. What are the possibilities of DNA fingerprinting and gene mapping?
Answer:
DNA fingerprinting:

1. To resolve paternity disputes
2. To identify missing persons when they are later found.
3. To identify those involved in crimes

Gene mapping:

1. To understand the exact location of the genes that control each trait in the DNA.
2. To perform gene therapy by removing defective genes.
3. To create new species of organisms.

The 18th question carries 4 scores (1 × 4 = 4 scores)

Question 18.
A. Given below is an illustration showing how sex determination takes place in men.

a) Observe the illustration and examine the 4 types of possible offspring. Specify their sex chromosomes.
b) What are the inferences you arrive at from this illustration?
c) What is the probable ratio of the formation of male and female children in men?
d) Which are the sex-determining chromosomes in men?
Answer:
a) [i] and [iii] are female children having XX chro-mosomes. [ii] and [iv] are male children having XY chromosomes.

b) The sex chromosomes of a male determine the sex of a child. The probability of the formation of male and female children is almost equal [1:1].

c) 1:1

d) Sex determining chromosomes in men are X and Y.

OR
B. Select the suitable code from the indicators and write them on the basis of correct features in the given statements
Cerebrum – CRB, Cerebellum – CRL, Medulla oblongata – MOG, Hypothalamus – HYP, Thalamus – THL
Answer:
(a) It plays an important role in problem solving, planning and voluntary movements – CRB
(b) Helps to maintain equilibrium of the body by coordinating muscular activities – CRL
(c) Helps in maintaining homeostasis by regulating body temperature, hunger, thirst and emotions – HYP
(d) Controls involuntary activities like heartbeat, ventilation, vomiting, cough, sneezing etc. – MOG
(e) Acts as the relay station of messages to and from the cerebrum – THL
(f) Centre of memory, intelligence, thinking and imagination – CRB
(g) The second largest part of the brain – CRL
(h) Pain killers act on this part of the brain – THL