Maharashtra SSC Science and Technology Part 2 Board Paper March 2024

Q.1 (A)(i) Regeneration occurs in ....................... .

Q.1 (A)(ii) Lactobacillus brevis gives us the beverage ..................... .

Q.1 (A)(iii) A minor change occurs due to change in position of any nucleotide is termed as .................... .

Q.1 (A)(iv) Atomic power plant in Maharashtra is .................... .

Q.1 (A)(v) Example of phylum Arthropoda is ...................... .

Q.1 (B)(i) Pick the odd man out :
duckbill platypus, pomfret, lungfish, peripatus.

Q.1 (B)(ii) Write co-relation :
Skin : Melanin : : Pancreas : .....................

Q.1 (B)(iii) State, true or false :
Production of various useful aquatic organisms with the help of water is called blue revolution.

Q.1 (B)(iv) Write full form of WHO.

Q.1 (B)(v) Match the pair :

Q.2 (A)(i) Give scientific reason : Though tortoise lives on land as well as in water, it cannot be included in class-Amphibia.

Q.2 (A)(ii) Give scientific reason : Hydroelectric energy, solar energy and wind energy are called renewable energies.

Q.2 (A)(iii) Give scientific reason : We feel tired after exercise.

Q.2 (B)(i) Write four adverse effects of radiations on human body.

Q.2 (B)(ii) Redraw and complete the given chart.

[Chart: a central circle labelled ‘Factors affecting the Social Health’ with four empty circles joined to it, two on the left and two on the right.]

Q.2 (B)(iii) Write any four important facts which must be thought over while considering the scope of disaster.

Q.2 (B)(iv) Name two fuels obtained by microbial processes. Why is it necessary to increase the use of such fuels ?

Q.2 (B)(v) What is DNA fingerprinting ? Where is it mainly useful ?

Q.3 (i) (a) What are vitamins ?
(b) Classify them according to their solubility.
(c) Give one example of each type as per above classification.

Q.3 (ii) Explain the following terms :
(a) Stem cells
(b) Cloning
(c) Genetically modified crops.

Q.3 (iii) Complete the given paragraph by filling the blank spaces from the options given in the bracket.
[oxygen, pyridines, mechanical, CO₂, petroleum, fatal, polyester, norcadia]
Spilling of ....................... oil occurs in ocean due to various reasons. This oil may prove .................. and toxic to aquatic organisms. It is not easy to remove the oil layer from surface of water by .................. method. However, bacteria like Pseudomonas spp. and Alcanovorax borkumensis have to ability to destroy the ................... and other chemicals. Hence, these bacteria are used to clear the oil spills. These are called as hydrocarbonoclastic bacteria (HCB). HCB decompose the hydrocarbons and bring about the reaction of carbon with ............... . ................. and water is formed in this process.

Q.3 (iv) Observe the given picture and answer the questions.

[Picture: a tall tower carrying a set of long blades at the top; the blades are shown turning, their shaft passes through a gear box to a generator mounted behind them, and the whole unit turns on the tower.]

(a) Identify the given diagram.
(b) What is the source of energy in this project ?
(c) Why this source is supposed to be ecofriendly ?

Q.3 (v) Complete the following chart :

[Chart: a central circle labelled ‘Hobbies helpful to overcome stress’ with six empty circles joined to it — two above, two at the sides and two below.]

Q.3 (vi) Write names of any six materials which are to be in the first aid box.

Q.3 (vii) (a) Define vestigial organs.
(b) Write names of any two vestigial organs in the human body.
(c) Write name of those animals in which these vestigial organs are functional.

Q.3 (viii) Read the statements and answer accordingly :
(a) Calcareous spines are present on the body. Tube feet are used for locomotion and capturing prey also. — Identify the phylum and give one example.
(b) I live in your small intestine. Pseudocoelom is present in my thread like body. — Identify the phylum and give one example.
(c) My body is spindle shaped. I respire with the help of gills. — Identify my class and give one example.

Q.4 (i) Answer the following questions based on human male reproductive system :
(a) In which organ sperms are formed ?
(b) What is the length of a sperm ?
(c) What is the work of vas deferens ?
(d) By which type of cell division, sperms are formed ?
(e) Name any two unpaired organs of male reproductive system.

Q.4 (ii) Answer the following questions based on environmental conservation and biodiversity :
(a) Complete the flow chart :

[Flow chart: a box labelled ‘Classification of threatened species’ with arrows going down to four empty boxes.]