Maharashtra SSC Class 10 Science and Technology II March 2020 question paper with answers

Q.1 (A)

1 mark each

Q.1 (A) (i)1 mark $Transfer of information from molecule of DNA to mRNA is called ____ process.$
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Q.1 (A) (ii)1 mark $Body breaks up into several fragments and each fragment starts to live as a new individual. This is ____ type of reproduction.$
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Q.1 (A) (iii)1 mark $Incomplete combustion of fuels leads to formation of ____$
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Q.1 (A) (iv)1 mark $The spindle fibres start appearing from ____ stage of karyokinesis.$
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Q.1 (A) (v)1 mark $Salts which can be used as supplement of calcium and iron are obtained from ____$
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Q.1 (B)

1 mark each

Q.1 (B) (i)1 mark $Find odd one out: Drying, Salting, Cooking, Soaking with sugar.$
Q.1 (B) (ii)1 mark $Write the correct co-relation: Annelida : Earthworm :: Platyhelminthes : ____$
Q.1 (B) (iii)1 mark $State whether True/False: Tobacco containing substances cannot cause cancer of mouth and lungs.$
Q.1 (B) (iv)1 mark $Write function of testes.$
Q.1 (B) (v)1 mark $I am connecting link between Reptilia and mammals. What is my name?$

Q.2 (A)

2 marks each · attempt any 2

Q.2 (A) (i)2 marks $Give scientific reason: Indians should follow family planning for controlling the population.$
Q.2 (A) (ii)2 marks $Give scientific reason: We feel exhausted after exercising.$
Q.2 (A) (iii)2 marks $Give scientific reason: Hydroelectric energy, solar energy and wind energy are called renewable energies.$

Q.2 (B)

2 marks each · attempt any 3

Q.2 (B) (i)2 marks $Complete the following chart showing the 'Effect of Radioactive Pollution' by writing the appropriate effect in each of the four blank boxes.$
Q.2 (B) (ii)2 marks $Distinguish between Aves and Mammalia.$
Q.2 (B) (iii)2 marks $By observing the given picture, write any two effects of this disaster.$
Q.2 (B) (iv)2 marks $Explain four ways to minimize stress.$
Q.2 (B) (v)2 marks $Complete the following conceptual picture on the uses of 'Microbes' by writing the appropriate use in each of the four blank boxes. (Two boxes are already filled as 'Oil spill' and 'Biogas and Composting'.)$

Q.3

3 marks each · attempt any 5

Q.3 (i)3 marks $Explain the importance of Anatomical evidences with examples.$
What will you do? Why?
Q.3 (ii) (a)3 marks $Child of your neighbor is addicted to tobacco chewing. What will you do? Why?$
Q.3 (ii) (b) $Your friend has developed the hobby of snapping selfies. What will you do? Why?$
Q.3 (ii) (c) $Your sister has become incommunicative. She prefers to remain alone. What will you do? Why?$
Q.3 (iii)3 marks $Which precautions are necessary for proper decomposition of domestic waste?$
Observe the diagram of the animal given in the paper (a cockroach, with the parts Head, Thorax, Abdomen, Wings and Legs labelled) and answer the following questions.
Q.3 (iv) (a)3 marks $To which phylum does the animal included in the diagram belong?$
Q.3 (iv) (b) $What is the exoskeleton made up of?$
Q.3 (iv) (c) $What is the symmetry?$
Explain the following concepts in short.
Q.3 (v) (a)3 marks $Explain in short the concept: Surrogacy.$
Q.3 (v) (b) $Explain in short the concept: In Vitro Fertilization (IVF).$
Q.3 (v) (c) $Explain in short the concept: Sperm Bank.$
Q.3 (vi)3 marks $Label the body organization of human in the given figure by writing the name of the organ indicated by each of the boxes.$
Q.3 (vii)3 marks $Make a table based on forms of energy and corresponding devices by completing the blanks: Forms of Energy Devices a. Electric____b. Mechanical Sewing machine, Bicycle c. Thermal____d.____Solar cooker, Solar heater$
Words given in brackets: (Mechanical, Rhizobium, Aquatic, Toxic, $\text{CO}_2$ , Nitrogen, Pseudomonas, Amoeba, Bacteria, Hydrocarbons).
Q.3 (viii)3 marks $Complete the paragraph using proper words: Spilling of petroleum oil occurs in ocean due to various reasons. This oil may prove fatal and toxic to ____ organisms. It is not easy to remove the oil layer from surface of water by ____ method. However, bacteria like ____ spp. and Alcanivorax borkumensis have the ability to destroy the pyridines and other chemicals. Hence, these ____ are used to clear the oil spills. These are called as hydrocarbonoclastic bacteria (HCB). HCB decompose the ____ and bring about the reaction of carbon with oxygen. ____ and water is formed in this process.$

	Forms of Energy	Devices
a.	Electric	____
b.	Mechanical	Sewing machine, Bicycle
c.	Thermal	____
d.	____	Solar cooker, Solar heater

Q.4

5 marks each · attempt any 1

Attempts at various levels are performed for conserving environment. Which role would you like to perform? Give two actions each.
Q.4 (i) (a)5 marks $Give two actions you would perform in the role of Prevention for conserving the environment.$
Q.4 (i) (b) $Give two actions you would perform in the role of Control for conserving the environment.$
Q.4 (i) (c) $Give two actions you would perform in the role of Production for conserving the environment.$
Q.4 (i) (d) $Give two actions you would perform in the role of Awareness for conserving the environment.$
Q.4 (i) (e) $Give two actions you would perform in the role of Conservation for conserving the environment.$
Answer the following questions on biotechnology.
Q.4 (ii) (a)5 marks $What is Biotechnology?$
Q.4 (ii) (b) $Give one use of Biotechnology.$
Q.4 (ii) (c) $Give one commercial use of Biotechnology.$
Q.4 (ii) (d) $Write two bacterial examples of biofertilizer.$
Q.4 (ii) (e) $Write two names of crops genetically developed.$