CBSE ADDA

Life processes – The processes that are necessary for an organism to stay alive. Eg. Nutrition, respiration, etc. Criteria of life - (i) Growth  (ii) Movement Nutrition - The process of taking  in food and its utilizes it to get energy, for growth, repair and maintenance, etc. and excretes the waste materials from the body is called Nutrition. Types of nutrition 1. Autotrophic nutrition (Auto =self:  trophos = nourishment) E.g. Plants, Algae, blue green bacteria. Process – Photosynthesis (Photo=light; Synthesis= to combine) Raw materials- (i) Carbon dioxide (ii)Water Chlorophyll Formula :  C55H72O5N4Mg Equation-     6CO 2   +  6H 2 O              sunlight /     Chlorophyl   ----->      C 6 H 12 O 6      +     6O 2 Energy conversion- Light/Solar energy to Chemical energ Role off Chlorophyll- To trap the sun’s energy for photosynthesis Factors- (i) Carbon dioxide (ii) Water(iii) Light (iv) Temperature Events/ Steps of photosynthesis-   (i) Absorption of light energy by chlorophyll

10th biology fifty 50 solved questions  CBSE NCERT chapter Life Process 1.Name the product and by product of photosynthesis. 2.In which biochemical form the photosynthate moves in phloem tissue? 3.What are the raw materials of photosynthesis? 4.What is the similarity between chlorophyll and hemoglobin? 5.Name the products of photolysis of water. 6.What are the end products of light dependant reaction? 7.Which cell organelle is the site of photosynthesis? 8.What is the difference between digestion of heterotrophs and saprotrophs? 9.Give example of two plants and two animal parasites. 10.Name the enzyme present in saliva, what is its role in digestion? 11.Which chemical is used to test for starch? Which colour shows the presence of starch? 12.Give the term- rhythmic contraction of alimentary canal muscle to propel food. 13.Name the three secretions of gastric glands. 14.What is the function of mucus in gastric gland? 15.Name the sphincter which regulates the exit of food from the stomac

X Real Number MCQ  Assignments in Mathematics Class X (Term I)   1. Euclid’s division algorithm can be applied to : (a) only positive integers            (b) only negative integers (c) all integers                            (d) all integers except 0.  2. For some integer m , every even integer is of the form : (a) m (b) m + 1 (c) 2 m (d) 2 m + 1 3. If the HCF of 65 and 117 is expressible in the form 65 m – 117, then the value of m is : (a) 1 (b) 2 (c) 3 (d) 4 4. If two positive integers p and q can be expressed as p = ab 2 and q = a 3 b , a ; b being prime numbers, then LCM ( p, q ) is : (a) ab (b) a 2 b 2 (c) a 3 b 2 (b) a 3 b 3 5. The least number that is divisible by all the numbers from 1 to 10 (both inclusive) is : (a) 10 (b) 100 (c) 504 (d) 2520 6. 7 × 11 × 13 × 15 + 15 is : (a) composite number                 (b) prime number (c)

CBSE_NCERT class 10  Chapter Real Numbers Practice questions 1. The product of three integer p,q,r is 72 where p, q, rare positive integers. HCF of p and q is 2. HCF of p and r is 1. Find the LCM of p,q,r 2. Find the LCM and HCF of 12, 15 and 21 by the prime factorization method. 3. Find the LCM and HCF of 6 and 20 by the prime factorization method. 4. State whether 13/3125 will have a terminating decimal expansion or a non-terminating repeating decimal. 5. State whether 17/8 will have a terminating decimal expansion or a non-terminating repeating decimal. 6. Find the LCM and HCF of 26 and 91 and verify that LCM × HCF = product of the two numbers. 7. Use Euclid’s division algorithm to find the HCF of 135 and 225 8. Use Euclid’s division lemma to show that the square of any positive integer is either of the form 3m or 3m + 1 for some integer m 9. Prove that √3 is irrational. 10. Show that 5 – √3 is irrational 11. Show that a

Self Evaluation Tests Paper For Maths-1 1. The values of the remainder r, when a positive integer a is divided by 3 are 0 and 1 only. Justify your answer No. According to Euclid’s division lemma, a = 3q + r, where 0 ≤ r < 3 and r is an integer. Therefore, the values of r can be 0, 1 or 2. 2. Can the number 6n, n being a natural number, end with the digit 5? Give reasons. No, because 6 n = (2 × 3) n = 2 n × 3 n , so the only primes in the factorization of 6 n are 2 and 3, and not 5. Hence, it cannot end with the digit 5. 3. Write whether every positive integer can be of the form 4q + 2, where q is an integer. Justify your answer. No, because an integer can be written in the form 4q, 4q+1, 4q+2, 4q+3. 4. “The product of two consecutive positive integers is divisible by 2”. Is this statement true or false? Give reasons. True, because n (n+1) will always be even, as one out of n or (n+1) must be even 5. “The product of three consecutive