<p> First Terminal examination</p><p>Science STD 7</p><p>PHYSICS</p><p>I. Fill in the Blanks 1. Sea breeze occurs during ______</p><p>2. Wind currents are generated due to the ______on the earth</p><p>3. Air moves from the region of ______pressure to a region of ______pressure</p><p>4. Heat is transferred in liquids and gases by the process of ______.</p><p>II. State reasons 1. Smoke always rises up </p><p>2. Steel pans are provided with copper bottoms</p><p>3. When air is blown over a paper strip, it lifts up</p><p>4. A hot utensil kept away from the flame cools down.</p><p>III. With the help of any two activities show that air exerts pressure.</p><p>IV. Answer the following questions 1. Why do we prefer woolen clothes in winter? </p><p>2. Write any two similarities and differences between a clinical and a laboratory thermometer. BIOLOGY</p><p>I. Name the following 1. The largest gland in human body</p><p>2. Piercing and tearing teeth 3. The bacteria which is present in the roots of leguminous plants</p><p>4. The part of stomach where the swallowed grass is stored in cud chewing animals</p><p>II. State Reasons 1. Humans cannot digest cellulose</p><p>2. Intestinal juice is very important for digestion</p><p>III. Define 1. Absorption 2.Autotrophs</p><p>IV. Differentiate between saprotrophic mode of nutrition and parasitic mode of nutrition </p><p>V. Draw and mark the digestive system of humans</p><p>VI. Write the functions of Hydrochloric acid Bile Villi Saliva Tongue</p><p>VII. Explain the process of digestion in amoeba CHEMISTRY</p><p>I. Fill in the blanks 1. ______soil retains more water</p><p>2. Photosynthesis is a ______change</p><p>3.The mixture of ______and ______is soil.</p><p>II. Answer the following 1. What is rust? Write the chemical equation for the formation of rust</p><p>2. What is soil pollution? How can it be prevented?</p><p>3. A soil sample takes 12 minutes to percolate 648ml of water. Find its percolation rate</p><p>4. When liquefied petroleum gas burns, physical and chemical changes take place. Which are these changes and explain?</p><p>5. Draw and label the horizons in the soil profile</p><p>III. State reasons 1. A hissing sound is heard when baking sods is added to vinegar</p><p>2. The soil good for grooving cotton is sandy-loam </p><p>3.On hot summer days the air above the soil seems to shimmer</p>