Maharashtra Board SSC Class 10 Science 2 Sample Paper Set 3 with Answers Solutions Pdf Download.
Maharashtra Board Class 10 Science 2 Model Paper Set 3 with Answers
Time: 2 Hours
Total Marks: 40
Note:
- All questions are compulsory.
- The numbers to the right of the questions indicate full marks.
- Answer to every main question must start on a new page.
- In case of MCQs (Q. No. 1(A)) only the first attempt will be evaluated and will be given credit.
- For every MCQ, the correct alternative (A), (B), (C) or (D) with sub-question number is to be written as an answer.
For Eg.: (i) (A), (ii) (B), (iii) (C) or (iv) (D) - Scientifically correct and labelled diagrams should be drawn wherever necessary.
- Each answer must have correct question number and sub-question number.
Question 1.
(A) Choose the correct alternative. [5]
i. __________ supplies food material to the developing embryo in uterus. (D)
(A) Corpus luteum
(B) Endometrium
(C) Follicle
(D) Placenta
Answer:
(D) Placenta
ii. Which of the following is NOT a physical problem arising due to radiation of cell phones? (B)
(A) Headache
(B) Leprosy
(C) Insomnia
(D) Tinnitus
Answer:
(B) Leprosy
iii. Phenylketonuria is a genetic change in __________ cells. (A)
(A) liver
(B) skin
(C) heart
(D) lungs
Answer:
(A) liver
iv. __________ is the process of transfer of information from DNA to mRNA. (C)
(A) Translocation
(B) Mutation
(C) Transcription
(D) Translation
Answer:
(C) Transcription
v. Which of the following is the first phase of karyokinesis? (D)
(A) Anaphase
(B) Telophase
(C) Metaphase
(D) Prophase
Answer:
(D) Prophase
(Note: Students are expected to write the correct option in the answer. Example: i. (A))
(B) Answer the following. [5]
i. What is the central dogma?
ii. Identify the phylum of the given organism.
iii. Find the correlation.
Coffee : Lactobacillus brevis :: Cider : __________
iv. Find the odd one out and explain.
Cowper’s gland, Bartholin’s gland, Prostate gland, Seminal vesicle
v.
| Column I | Column II |
| a. Interferon | 1. Diabetes |
| b. Factor VIII | 2. Dwarfism |
| 3. Viral infection | |
| 4. Cancer | |
| 5. Hemophilia |
Answer:
i. Central dogma is the process of synthesis of proteins by DNA, through RNA.
ii. The given organism belongs to phylum Cnidaria.
iii. Saccharomyces cerevisiae
(Note: In iFind the correlation/ complete the analogy’ students are expected to identify the correlation between two components and rewrite it. Students must give an appropriate explanation, only if asked in the question.)
iv. Bartholin’s gland
Bartholin’s gland is a part of human female reproductive system, while others are the part of human male reproductive system.
(Note: In ‘Find the odd one out’, students are expected to identify the odd one out of 4 – 5 components. Students must give an appropriate explanation, only if asked in the question.)
v.
| Column I | Column II |
| a. Interferon | 3. Viral infection |
| b. Factor VIII | 5. Hemophilia |
(Note: In ‘Make pairs’, students are expected to write the answer in tabular format.)
Question 2.
(A) Give scientific reasons. (Attempt any 2) [4]
i. Enzymes obtained by microbial process are mixed with detergents.
ii. Human beings have important place in environment.
iii. Some of the organs in human body are most valuable.
(B) Answer the following. (Attempt any 3) [6]
i. State any four objectives of disaster management.
ii. Complete the following chart.
iii. Write a short note on Biotechnology – Professional uses.
iv. Write any four harmful effects of consumption of alcoholic drinks on human body.
v. Distinguish between asexual reproduction and sexual reproduction.
Answer:
(A) i. Enzymes obtained by microbial process are mixed with detergents because:
a. To remove dirt/muck, detergents and water with high temperature is required. However, cost of heating water is high.
b. The enzymes obtained by microbial processes are active at low temperatures. Hence, the process of dirt/muck removal can occur at low temperatures when enzymes are mixed with detergents and energy can be saved.
c. Certain enzymes can act specifically on different types of stains (starch, protein, oils, etc.) and hence enable more effective removal of such stains when mixed with detergents.
ii. a. Human life is an integral part of nature and human survival is closely linked with environment.
b. Due to rapid increase in human population and industrialization, humans have over utilized natural resources; leading to degradation of environment.
c. The environment influences the life of human beings and human beings modify their environment as humans are the apex predators in the food chain.
d. Humans are capable of conserving and improving the quality of nature and thus, can play a major role in maintaining environmental balance.
Humans, therefore have an important place in the environment.
iii. a. Organs like the eyes, heart, lungs, pancreas, liver, bone, kidney and skin play significant roles in various physiological (metabolic) activities and maintaining a healthy human life. A person will not be able to lead a normal life if these valuable organs are damaged or absent.
b. These organs can also be donated to save the life of individuals in need.
c. During the life of an individual, certain organs like kidney, skin, etc. can be donated to people who have lost the function of these organs due to aging, accidents, infections, disorders, etc.
d. After death (posthumous), organs like liver, heart and eyes can be donated.
Hence, these organs in the human body are more valuable. [2 Marks]
(B)
i. The objectives of disaster management are as follows:
a. To reduce the loss of human life caused during the disaster and to rescue people from those disasters.
b. To reduce the effect of disaster by supplying essential commodities to people.
c. To restore the human life in the region and bring normalcy in life of people affected by disaster.
d. To rehabilitate the people affected by disaster.
e. To take precautionary steps so as to reduce the effect of similar disasters in future.
ii.
(Note: In ‘Complete the flowchart/ table’, students are expected to fill in the blanks with appropriate answers and redraw the flowchart/ table)
iii. The professional or commercial uses of biotechnology are as follows:
a. Biotechnology is used in the field of agriculture in order to improve crop variety and yields by techniques such as genetic modification, hybridization, etc.
b. Techniques such as artificial insemination and embryo transfer are useful in animal husbandry to improve quality and/or quantity of animal products like milk, wool, meat, etc.
c. Biotechnology has applications for the welfare of human health in diagnosis and treatment of diseases using vaccines, interferons, antibiotics, etc. Also, gene therapy and therapeutic cloning have application in treating genetic disorders.
d. Biotechnology is used for the manufacture of industrial products, environmental management, food processing, green revolution, white revolution and blue revolution.
e. DNA fingerprinting techniques play an important role in forensic sciences and paternity testing.
iv. The harmful effects of consumption of alcoholic drinks on human body are as follows:
a. Decrease in efficiency of nervous system (especially brain)
b. The efficiency of liver is also affected
c. It can ateo reduce the lifespan of the person
d. In adolescents, it affects brain development and reduces ability of memorization and learning.
(Note: In ‘Write properties/characteristics/uses/advantages/effeds’, students are expected to write a minimum of 4 points.)
v.
| Asexual reproduction | Sexual reproduction |
| a. Reproduction that occurs with the help of somatic cells is called as asexual reproduction. | Reproduction that occurs with the help of two germ cells is called sexual reproduction. |
| b. This is uniparental reproduction, thus both male and female parent are not necessary. | Male and female parent are necessary for sexual reproduction. |
| c. This reproduction occurs with the help of mitosis only. | This reproduction involves both mitosis and meiosis type of cell division. |
| d. The new individual formed by this method is genetically identical to its parent. | New individual formed by this method is genetically different from parents. |
| e. Asexual reproduction occurs in different individuals by various methods like binary fission, multiple fission, budding, fragmentation, regeneration, vegetative propagation, spore formation, etc. | In all individuals sexual reproduction occurs by gamete formation and fertilization. |
(Note: In ‘Write the difference/ Distinguish’, students are expected to write a minimum of 4 independent points of differences between two components in a tabular format.)
Question 3.
Answer the following. (Attempt any 5) [15]
i. “Gender of child is determined by the male partner of couple.” Draw a diagram explaining the above statement.
ii. One solar panel produces a potential difference of 20 V and current 4 A. Describe how you can obtain a potential difference of 80 volts and current of 12 A with a solar array using solar panel. You can use sign of a battery for a solar panel.
iii. Observe the given diagram and answer the questions given below it.
a. Identify the molecule labelled as ‘X’ in the given diagram.
b. What would be the sequence on the anticodon, if the corresponding codon sequence on the mRNA is GAU?
c. During the process of translation, the amino acids are bound by which bond?
iv. What are the benefits of mixing ethanol with petrol and diesel?
v. Explain the concept of IVF.
vi. Complete the flowchart and explain the energy conversion in the given power plant.
vii. You are in your house when you suddenly experience earthquake tremors. What necessary rescue steps will you take?
viii. Explain the problems faced by common man due to incidences of cyber crime.
Answer:
i. Gender of child is determined by the male partner of couple because:
a. In human males, the 23rd pair of chromosome contains, two dissimilar chromosomes – ‘X’ chromosome and ‘Y’ chromosome.
b. In females, the 23rd pair contains two ‘X’ chromosomes.
c. All children inherit one ’X’ chromosome from their mother. The other chromosome is inherited from the father.
d. If the chromosome inherited from the father is ‘X’, then the child will be a girl and if it is Y, then the child will be a boy.
ii. a. A solar panel producing potential difference of 20 V and current of 4A is represented below.
b. Four solar panels producing 20 V and 4 A should be connected in series to form a solar string producing potential difference of 80 V and current of 4 A.
c. The solar string producing 80 V and 4 A is connected in parallel with two more solar strings producing 80 V and 4 A to form a solar array producing a potential difference of 80 V and current of 12 A.
iii. a. The molecule labelled as ‘X’ is tRNA.
b. The sequence on the anticodon would be CUA.
c. During translation, the amino acids are bound by peptide bonds.
iv. a. Petrol and diesel are exhaustible sources of energy, it is expensive and burning of these fuels causes air pollution.
b. However, ethanol is obtained by fermentation of molasses using yeast (Saccharomyces) and thus the cost of production is less.
c. Ethanol is a clean fuel. When ethanol is mixed with petrol or diesel, it burns more efficiently, minimizes the use of valuable fossil fuel resources and reduces the pollution caused by them.
v.
a. IVF is a technique in which fertilization is brought about in the test tube. Sperm is injected into the ovum using a micropipette.
b. The embryo formed after fertilization is implanted in the uterus of a woman at the appropriate time.
c. Childless couples, who have problems like less sperm count, obstacles in oviduct, etc., can use IVF technique for having a child.
vi.
a. In a nuclear power plant, uranium or plutonium are used as fuel.
b. Conversion of nuclear energy to thermal energy during nuclear fission process: During the fission of nuclei of atoms like uranium or plutonium, the nuclear energy is converted to thermal energy.
c. Conversion of thermal energy to kinetic energy in steam: This thermal energy is used to heat the water present in a boiler. Steam of very high temperature and pressure is generated and directed on the blades of the turbine.
d. Conversion of kinetic energy in steam to kinetic energy in turbine: The kinetic energy produced in the steam is then used to drive the turbine.
e. Conversion of kinetic energy in turbine to electrical energy: The turbine rotates the generator connected to it which in turn produces electrical energy.
(Note: In this question students are expected to fill in the blanks in the flowchart with appropriate answers and redraw the flowchart, followed by explanation.)
vii. In case of an earthquake, rescue steps are as follows:
a. Run for a safe exit and try to reach an open place away from buildings and tall trees.
b. Avoid using elevators while exiting a building. Use staircase instead.
c. If you are stuck in a room, take shelter under a hard surface, such as a table.
viii. Some of the problems faced by the common man due to the incidences of cyber crime are as follows:
a. Sale of inferior quality or impaired items than those shown on online shopping websites deceive the customers.
b. Online bank transactions are done by using the PIN without the knowledge of the customers, which results in financial loss to the customers.
c. Hacking of confidential information of government, institutes and companies through internet, puts the data of general public at risk.
d. Fake accounts on social media sites like Facebook leads to teasing or financial exploitation of people.
e. Piracy of photos, videos, music, software, literature, etc. causes huge financial losses to the legal owner of these things.
f. Circulation of derogatory messages, vulgar pictures and inflammatory statements on electronic media lead to tensions in the society.
g. Personal information and phone numbers get shared with others through social media sites like email, Facebook and WhatsApp. This may lead to incoming of unwanted messages which can impair or shutdown the mobiles and computers.
Question 4.
Answer the following. (Attempt any 1) [5]
i. In a cropland ecosystem, grasshoppers feed on crop plants and cause huge losses to farmers. Rodents like rats feed on these grasshoppers. Snakes are major predators of rodents and help control their population.
Based on the given paragraph answer the questions given below.
a. How can the food chain of this cropland ecosystem be represented?
b. What would happen if all the snakes are removed from the field?
c. What would happen if all the crops in the farm are harvested?
d. Hawks are natural predators of snakes. What would happen if hawks are present around the field?
e. In a similar manner, draw the food chain of a pond ecosystem.
ii. Classify the given organisms with detailed explanation.
Answer:
a. Crop plants → Grasshoppers → Rats (Rodents) → Snake → Hawk
b. If all the snakes are removed from the field, the number of rodents would iincrease drastically.
c. If all the crops (primary producers) in the farm are harvested the food chain would be disrupted and the population of consumers (grasshoppers, rats and snakes) would be affected.
d. Hawks would reduce the population of snakes which would allow the population of rodents to increase.
e. Algae → Small fishes Big fishes → Bird (Producer) (Primary (Secondary (Tertiary consumer) consumer) consumer)
ii. a. Classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Amphibia
The characteristics of frog are:
1. Larvae of amphibians are strictly aquatic and perform aquatic respiration only. Adults can perform aquatic as well as aerial respiration.
2. Exoskeleton is absent and skin is usually kept moist for respiration.
3. They have two pairs of appendages and their digits are without claws.
4. Neck is absent. Eyes are prominent with eyelids. External ear is absent, but tympanum is present.
b. Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Reptilia
The characteristics of wall lizard are:
1. It is a poikilothermic (cold-blooded) animal.
2. Lizards locomote by creeping, as their body cannot be lifted up.
3. In lizards, digits are provided with claws.
4. Their skin is dry and scaly.
5. Neck is present between the head and trunk.
6. External ear is absent.