CBSE ADDA

Q1. What are the elements of weather? Answer: The elements of weather are humidity, temperature, rainfall, wind speed, etc. Q2. What do you understand by the climate of the place? Answer: The average weather [pattern taken over a long time is called climate of the place. Q3. How are all changes in the weather caused? Answer: All changes in the weather are caused by the sun. Q4. Why does the tropical region have a hot climate? Answer:  It has a hot climate because of its location around the equator. Even in the coldest month the temperature is generally higher than about 15degree C. During the hot  summers, the temperature may cross 40 degrees. Q5. What do you mean by adaptations? Answer: It is the phenomenon of acquiring certain features and habits that ensure better survival in given surroundings. Q6. Why are the animals in the tropical rainforests exhibit variety of adaptations? Answer: The climatic conditions in rainforests are highly suit

CBSE Exam  Congruence of  Triangle Solved Questions Q. 1. Prove that Sum of Two Sides of a triangle is greater than twice the length of median drawn to third side. Given:   Δ ABC in which AD is a median. To prove:   AB + AC > 2AD. Construction:   Produce AD to E, such that AD = DE. Join EC. Proof:   In ΔADB and ΔEDC, AD = DE              (Construction) BD = BD             (D is the mid point of BC) ∠ ADB = ∠ EDC       (Vertically opposite angles) ∴ ΔADB   ≅       ΔEDC   (SAS congruence criterion) ⇒ AB = ED               (CPCT) In ΔAEC, AC + ED > AE           ( Sum of any two sides of a triangles is greater than the third side ) ∴ AC + AB > 2AD      ( AE = AD + DE = AD + AD = 2AD & ED = AB ) Q. 2.  ABC is an isosceles triangle in which AB = AC. Side BA is produced to D such that AD = AB (see the given figure). Show that ∠ BCD is a right angle. In ΔABC, AB = AC

IX CBSE - Formative Assessment-II [SET-1] Q.1. What are green revolution and white revolution? Q.2. What nutrients do the following provide: (i) Pea (ii) Linseed (iii) Vegetables (iv) pigeon pea (v) Wheat (vi) Castor (vii) Spices (viii) fruits. Q.3. Differentiate between Kharif and Rabi crops. Q.4. What is interspecific hybridization? Q.5. How does change in maturity duration of crop help the framers? Q.6. Categorize the following as macronutrients and micronutrients: (i) Calcium (ii) Molybdenum (iii) Phosphorus (iv) Iron (v) Boron (vi) Magnesium. Q.7. What is organic farming? Q.8. What is vermicomposting? Q.9. Differentiate between mixed and inter cropping. Q10. What are river lift systems? Q.11. Why are weeds considered as unwanted plants in cultivated lands? Q.12. In what three ways do the pests attack plants? IX CBSE - Formative Assessment-II [SET-2] Q.1. What qualities are expected in a cross-breed variety of fowl? Q.2.