Practice Questions CBSE - Science Class 10 (2023 Boards)

Question 1

Question 2

Question 3 Important

Question 4 Important

Question 5 Important

Question 6

Question 7 Important

Question 8

Question 9 Important

Question 10

Question 11

Question 12 Important

Question 13 Important

Question 14

Question 15 Important

Question 16

Question 17 [Assertion Reasoning] Important

Question 18 [Assertion Reasoning] Important

Question 19 [Assertion Reasoning] Important

Question 20 [Assertion Reasoning]

Question 21 (Choice 1) Important

Question 21 (Choice 2)

Question 22 Important

Question 23

Question 24 Important

Question 25 (Choice 1)

Question 25 (Choice 2)

Question 26 Important You are here

Question 27

Question 28 Important

Question 29 (Choice 1)

Question 29 (Choice 2) Important

Question 30 Important

Question 31 (a)

Question 31 (b) Important

Question 32 (Choice 1)

Question 32 (Choice 2) Important

Question 33 (a)

Question 33 (b)

Question 33 (c) Important

Question 34 (a) - Choice 1

Question 34 (b) - Choice 1 Important

Question 34 (c) - Choice 1

Question 34 (a) - Choice 2 Important

Question 34 (b) - Choice 2]

Question 34 (c) - Choice 2 Important

Question 35 (a) - Choice 1 Important

Question 35 (b) - Choice 1 Important

Question 35 (c) - Choice 1

Question 35 (a) - Choice 2

Question 35 (b) - Choice 2 Important

Question 35 (c) - Choice 2

Question 36 Important

Question 37 (a) - Choice 1 [Case Based]

Question 37 (b) i - Choice 2 [Case Based] Important

Question 37 (b) ii - Choice 2 [Case Based] Important

Question 38 (a) - Choice 1 [Case Based]

Question 38 (b) - Choice 1 [Case Based] Important

Question 38 (c) - Choice 1 [Case Based]

Question 39 (a) - Choice 1 [Case Based] Important

Question 39 (b) - Choice 1 [Case Based]

Question 39 (c) - Choice 1 [Case Based]

Question 39 (d) - Choice 1 [Case Based] Important

Question 39 (d) - Choice 2 [Case Based] Important

Study the food web shown below. 

Study the food web shown below - Teachoo.jpg

(a) Identify and write the food chain from the food web shown, in which the eagle will receive the highest percentage of the energy from the producers. 

(b) Which organism will be the most affected when a non-biodegradable pesticide is introduced into the soil? What is the phenomenon responsible for this called?

 

Answer: 

(a) According to the 10% law of energy flow , only 10% of the energy is passed onto the next trophic level. 

Therefore, the higher the number of trophic levels , the lesser the energy the final consumer (here: Eagle) gets.

10 Percent Law-Teachoo-01.jpg

Thus the chain with the lowest number of trophic levels would impart the highest energy to the eagle.

Grass --> Mouse --> Eagle  

(b) The eagle will be the most affected. 

This is due to biomagnification .

Biomagnification is the accumulation of toxic substances at higher levels of the food chain.

biological-magnification---teachoo.jpg

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class

Ask a doubt
Maninder Singh's photo - Co-founder, Teachoo

Made by

Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo