Maharashtra Board SSC Class 10 Science 2 Sample Paper Set 7 with Answers Solutions Pdf Download.
Maharashtra Board Class 10 Science 2 Model Paper Set 7 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. Transfer of information from molecule of DNA to mRNA is called as ___________ process. (C)
(A) translation
(B) transformation
(C) transcription
(D) transduction
Answer:
(C) transcription
ii. Cell plate formation occurs during (B)
(A) karyokinesis in animal cells
(B) cytokinesis in plant cells
(C) karyokinesis in plant cells
(D) cytokinesis in animal cells
Answer:
(B) cytokinesis in plant cells
iii. Pollen grains are formed by ___________ division in locules of anthers. (C)
(A) mitotic
(B) binary fission
(C) meiotic
(D) amitotic
Answer:
(C) meiotic
iv. Which of the following micro-organism is involved in soy sauce production? (A)
(A) Aspergillus oryzae
(B) Pseudomonas spp.
(C) Staphylococcus
(D) Acetobacter
Answer:
(A) Aspergillus oryzae
v. The disease related with the synthesis of insulin is ___________. (D)
(A) tuberculosis
(B) diarrheoa
(C) jaundice
(D) diabetes
Answer:
(D) diabetes
Question 1.
(B) Answer the following. [5]
i. Write whether the given statement is true or false.
Proteins are synthesized by DNA through RNA.
ii. Name the process of conversion of excess of proteins into useful substances like glucose.
iii. Identify the process shown in figure and name it.
iv. Match the columns.
| Column I | Column II |
| a. Uterus | 1. Produce sperms |
| b. Penis | 2. Produce testosterone |
| 3. Delivers sperms | |
| 4. Can accommodate a foetus |
v. Find the odd one out and state the reason.
Sea anemone, Sea urchin, Brittle star, Sea cucumber
Answer:
i. True
ii. Gluconeogenesis
iii. The process shown in the diagram is that of nuclear fission where a neutron is bombarded on an atom of Uranium – 235.
iv.
| Column I | Column II |
| a. Uterus | 4. Can accommodate a foetus |
| b. Penis | 3. Delivers sperms |
v. Sea anemone
It is a member of phylum Coelenterata whereas sea urchin, brittle star and sea cucumber are the members of phylum Echinodermata.
OR
Sea anemone is an acoelomate, whereas others are eucoelomates.
Question 2.
(A) Give scientific reasons. (Attempt any 2) [4]
i. Krebs cycle is also known as citric acid cycle.
ii. It is important to conserve our environment.
iii. Herbicide tolerant crop plants are beneficial in agriculture.
(B) Answer the following. (Attempt any 3) [6]
i. a. Define cellular respiration.
b. Mention the two types of respiration.
ii. Complete the following flowchart.
iii. Identify the phylum of following organism and state any four characteristics.
iv. Give any four examples of microbial enzymes.
v. Observe the following picture and write a note on pre- and post-disaster management of the depicted disaster.
Answer:
i. a. Acetyl-CoA (2 carbon compound) enters the mitochondria to combine with oxaloacetic acid (4 carbon compound) and form a six-carbon compound i.e., citric acid.
b. Since, citric acid is the first stable compound formed, Krebs cycle is also called citric acid cycle.
ii. It is important to conserve our environment to:
a. prevent depletion of natural resources
b. maintain the balance in nature
c. conserve biodiversity
d. solve the natural and artificial problems
e. reduce the impacts of pollution and prevent global warming
iii. a. Unwanted weeds adversely affect the growth of crop plants.
b. Unwarranted use of herbicides to kill these weeds may also affect the crop plants.
c. For better agricultural outputs, selective destruction of only weeds is essential.
d. Hence, in order to target only unwanted weeds and protect the crops from ill- effects of herbicides, herbicide tolerant crop plants are beneficial in agriculture.
(B) i. a. Cellular respiration is a type of respiration in which foodstuffs are oxidized for production of energy.
b. Two types of respiration: Aerobic respiration and anaerobic respiration.
ii.
iii. The given organism belongs to phylum porifera:
SMART TIP
The organism shown in the given diagram has an asymmetrical body plan and hance can be easily identified as a member of phylum Porifera.
a. Animals belonging to phylum Porifera are multicellular and have an asymmetrical body.
b. They have the simplest body plan amongst all multicellular organisms and are known as sponges.
c. Most of these animals are marine and few are fresh water dwellers.
d. Their body shows numerous pores called ostia and oscula. Water enters into the body through ostia and comes out through osculum.
e. They have special type of cells called collar cells.
f. The members of this phylum are sedentary (do not show locomotion), as they remain attached to the substratum.
g. Their body is supported by spicules or spongin fibres. These spicules are made up of calcium carbonate or silica.
h. Poriferans reproduce asexually and/or sexually.
i. They have the ability to regenerate.
For e.g. Sycon, Euspongia, Hyalonema, Euplectella, etc.
[Any four points]
iv. Oxido-reductases, transferases, hydrolases, lyases, isomerases, ligases.
[Any four examples]
v. A gas leak incident can be managed in the following manner:
a. Pre-disaster management:
1. The gas cylinders and the rubber tubes used must be certified.
2. Gas cylinders must be properly checked for leakage from pipe, nozzle or any other part, while installing.
b. Post-disaster management:
1. Do not try to turn ON or turn OFF any electrical appliances in the surrounding area.
2. Put out all flames, incense sticks, etc.
3. Turn off the LPG regulator and immediately put on the safety cap.
4. Open all the windows and doors to ensure ventilation.
5. Get in touch with the LPG cylinder dealer immediately.
Question 3.
Answer the following. (Attempt any 5) [15]
i. Explain with suitable examples importance of anatomical evidences in evolution.
ii. What are the meanings of following symbols? Write your role accordingly?
iii. Fill in the blanks by selecting the correct word from the bracket and complete the paragraph.
(collar, roundworms, marine, proboscis, acom worms, Urochordates, terrestrial, Herdmania, Balanoglossus, Doliolum, Saccoglossus)
Body of Hemichordates is divided into proboscis, ___________ and trunk. Notochord is present in the ___________ region only. These animals are also known as ___________. They are found in ___________ habitat. ___________ and ___________ are the members of this phylum.
iv. Observe the given figure and answer the questions given below it.
a. Identify labels A, B, C and D.
b. What does the given figure indicate?
c. Give examples of any two fuels that are obtained by microbial processes.
v. Explain somatic cell gene therapy with an example.
vi. Your younger brother or sister is under stress due to his/her exams. Mention any three measures to minimize stress?
vii. a. Define social health.
b. Enlist the four main factors that affect social health.
viii. Explain how effective disaster management makes us well prepared for future.
Answer:
i. a. Anatomical evidences are the similarities in structures and anatomy between different organisms.
b. The hand of human, foreleg of ox, flipper of whale and forelimbs of bat appear different superficially or morphologically.
c. Also, the function of these structures is different in different animals.
d. However, there is a similarity in the structure of bones and bony joints in the organs of these animals.
e. These similarities indicate that the animals evolved from a common ancestor thus providing proof of evolution.
ii.
iii. Body of Hemichordates is divided into proboscis, collar and trunk. Notochord is present in proboscis region only. These animals are also known as acorn worms. They are found in marine habitat. Balanoglossus and Saccoglossus are the members of this phylum.
(Note: In ‘Complete the paragraph1, students are expected to rewrite the completed paragraph and underline the answers.)
iv. a. A: Biomass B: Threshing
C: Cellulose D: Biofuel
b. The figure indicates biofuel production
c. Examples of fuels that are obtained by microbial processes are biogas, ethanol, biodiesel, methane, hydrogen gas, etc.
[Any two examples]
v. a. Gene therapy is used to treat genetic disorders using biotechnology.
b. In gene therapy, the affected somatic cells are genetically modified (i.e. abnormal gene is replaced by normal gene) to treat the disease.
c. For e.g. Gene therapy has made it possible to treat genetic disorders like phenylketonuria (PKT).
vi. Some measures to minimize stress are as follows:
a. Maintaining good communication and expressing our feelings to friends, peers, cousins, teachers and parents or noting them down in a diary.
b. Utilizing the free hours in fostering hobbies like material collection, photography, reading, cooking, sculpting, drawing, making rangoli, dancing, singing, listening to music, etc.
c. Diverting energy and mind towards positive thinking, so as to neutralize the negative thoughts. Regular exercising, getting a massage, practicing yoga and meditation.
d. Laughing loudly so as to relieve stress.
e. Playing sports and outdoor games so as to involve physical exercise, inculcate discipline, increase interaction with others, drive away loneliness, etc.
f. Inculcating traits like time management, planning of our own duties and taking own decisions.
g. If any of the above methods fail to reduce stress and leads to more serious problems like depression and frustration, then medical help, counselling and/or psychotherapy should be taken.
vii. a. Social health can be defined as the ability of a person to establish good relations with other persons.
b. The main factors which disturb the social health of an individual are:
1. Mental stress
2. Addiction
3. Incurable diseases
4. Excessive use of modern technology
viii. a. Any type of disaster whether minor or major, short-term or long-term, needs to be overcome and hence effective disaster management is of importance.
b. Disaster management involves either prevention of disaster or making required arrangements to face it or at least achieving the abilities to face it.
c. Disaster management includes the use of scientific methods to obtain data and its careful observation and analysis for achieving and improving the capability to face the disaster.
d. Based on this analysis, attempts can be made to minimize the losses.
e. The data also helps to prepare action plans for future disasters by studying various aspects of disaster such as preventive measures, rehabilitation and reconstruction and the method of effective execution of the plan.
Thus, effective disaster management makes us well prepared for future.
Question 4.
Answer the following. (Attempt any 1) [5]
i. Correct the given figure of human male reproductive system and explain in detail the ’ fonnation and maturation of sperms.
ii. Observe the following diagram and answer the questions.
a. With reference to point B in the above figure, potential energy of how much water in the dam will be converted into kinetic energy?
b. What is used as source of energy in the given power plant?
c. State one advantage and disadvantage associated with the given power plant.
d. Draw flow chart for energy transformation in the given power plant.
Answer:
i.
a. Testes contain numerous seminiferous tubules.
b. Germ cells present in the tubules divide by meiosis to produce sperms.
c. Sperms undergo physiological maturation, and their motility as well as the fertilizing capacity is increased in the head of epididymis.
d. These sperms move forward sequentially through tubules – rete testes, vasa efferentia, epididymis, vas deferens, ejaculatory duct and urinogenital duct.
SMART TIP
Students can use the following mnemonic to remember the order of passage of sperms Rita and Vasanti Enjoyed their Vacation to EUrope
R- Rete testis; V- Vasa efferentia, E- Epididymis, V- Vas deferens, E- Ejaculatory duct, U- Urinogen ital duct
e. As these sperms reach the urinogenital duct, they are ejaculated out through penis.
(Note: In ‘Correct the diagram and explain* 1 2 3, students are expected to draw a new corrected labelled diagram and write a detailed explanation.)
ii. a. With respect to point B, potential energy of half of the water in dam can be converted into electrical energy.
b. In a hydroelectric power plant, water reservoir is used as the source of energy.
c. Advantages of hydroelectric power plant:
1. No fuel is burnt in a hydroelectric power plant. Thus, no air pollution due to combustion of fuel occurs.
2. Electricity can be generated whenever required if the dam has sufficient water storage.
3. During rainy season, the water in the water reservoirs can be replenished and used for power generation.
[Any one]
Disadvantages of hydroelectric power plant:
1. Villages, towns, forests may submerge due to back-water caused by storage of water in dams. This leads to forced migration of the living population in that area.
2. The obstruction of the flow of river water may have adverse effect on the living world in the river.
[Any one]
d. Energy transformation in hydroelectric plant:
