CBSE Class 10 Science Answer Key Term 2: CBSE Class 10 Science Term 2 Paper was conducted today from 10:30 AM to 12:30 PM. Now, when the exam is over, students must be looking for correct answers to all questions asked in the CBSE Class 10 Science paper. Experts at Jagran Josh are continuously drafting solutions to the questions. The CBSE Class 10 Science Question Paper 2022 had a mix of easy and tricky questions. You can now check the correct answers to all questions from the Question Paper Solution provided below. The question paper for the CBSE Class 10 Science Term 2 Exam 2022 is also provided here in PDF format.
Check CBSE Class 10 Science Answer Key Term 2 below:
1. (i) Write the electronic configuration of element X, given by its symbol as under
(ii) Determine its position in the modern periodic table.
(iii) What is the nature of its oxide?
(iv) Name one other element of its group.
(i) Electronic configuration of element X (with atomic number - 20) is 2, 8, 8, 2.
(ii) It belongs to the 2nd group and 4th period of the modern periodic table.
(iii) It will form basic oxides as it is metallic in nature.
(iv) Magnesium (Mg)
2. (i) Write the name and draw the structure of a saturated hydrocarbon with four carbon atoms.
(ii) Write the number of single covalent bonds present in this compound.
(i) Name: Butane
(ii) 13 single covalent bonds
3. (a) Name the reproductive and non-reproductive parts of bread mould (Rhizopus).
(b) List any two advantages of vegetative propagation.
(a) Reproductive parts of bread mould (Rhizopus) - Sporangium
Non-reproductive parts of bread mould (Rhizopus) - Hyphae
(b) Two advantages of vegetative propagation:
(i) Helps in growing seedless plants.
(ii) Helps in preservation of the characters of the parent plant.
4. (a) State one drawback of each of the following:
i) Oral contraceptive pills
(a) (i) Oral contraceptive pills: It may disturb normal ovulatory menstrual cycles.
(ii) Copper-T: It cannot prevent sexually-transmitted diseases.
(b) Use of condoms is kept under Barrier Method.
Use of condoms is better as compared to other methods of contraception due to the following reasons:
(i) It helps to prevent the sexually-transmitted diseases.
(ii) It does not interfere with the normal menstrual cycles in females.
(b) Under which category of contraceptive methods is the use of condoms kept? In what way, its use is better as compared to other methods of contraception?
5. (a) Name the poles P, Q, R and S of the magnets in the following figures a and b.
(b) State the inference drawn about the direction of the magnetic field lines on the basis of these diagrams.
(a) Names of poles:
P - North pole
Q - South pole
R - North pole
S - South pole
(b) The magnetic field lines emerge from north pole and merge at the south pole.
When is the force experienced by a current-carrying straight conductor placed in a uniform magnetic field
(i) Maximum - When the conductor is placed perpendicular to the magnetic field.
(ii) Minimum - When the conductor is placed parallel to the magnetic field.
6. In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present in Grass? Justify your answer.
GRASS -->GRASS HOPPER -->FROG -->SNAKE -->PEACOCK
Energy present in Grass = 20000J
Justification: According to the ten percent law of energy in a food chain, only ten percent of energy is transferred to the next trophic level. Thus, the energy keeps on decreasing by 10% at each level.
*Explanation for students:
If, Energy available to grass = 20000J
Energy available to grass hopper = 10% of 20000 = 2000J
Energy available to frog = 10% of 2000 = 200J
Energy available to snake = 10% of 200 = 20J
And Energy available to peacock = 10% of 20 = 2J
(a) What is meant by garbage? List two classes into which garbage is classified.
(b) What do we actually mean when we say that the “enzymes are specific in their action”?
(a) The household waste or rubbish produced in our day-to-day life is called garbage. For example, spoilt food, vegetable peels, leaves, wood, grass, paper, plastic, etc.
Garbage is classified into the following two types:
(i) Biodegradable garbage - Garbage that can be decomposed naturally. Examples - vegetable peels, leaves, paper, etc.
(ii) Non-Biodegradable garbage - Garbage that cannot be decomposed naturally. Examples - metal, plastics, etc.
7. Name the reproductive parts of an angiosperm. Where are these Parts located ? Explain the Structure of its male reproductive Parts.
What is puberty? Mention any two changes that are common to both boys and girls in early teenage years.
Our experts are developing answers to the remaining questions. Keep visiting this page to know the correct answers to all questions in the CBSE Class 10 Science Term 2 Paper 2022.