Grade 7

Youtube playlist . Budding vs fragmentation: 1. In budding, the parent remains intact and the outgrowth(bud) becomes a new complete entity. Both are functional fully. But in fragmentation, each of the fragments takes time to "mature" and become fully functional. 2. In budding, one bud detaches at a time. In fragmentation, multiple fragments get formed from the parent. Questions: 1. Why do yeast not reproduce in the "dry" state, i.e. the way they are sold in the market? Shouldn't they be growing and multiplying and increasing the quantity of the "yeast powder"? 2. Can I graft mango scion on apple rootstock? Spores in fern: Why should you not eat the clean part of the moldy bread? Vegetative propagation of roots: Sweet potato time lapse . Sweet potato is a root tuber(has eyes from which new ones sprout). Sweet potato is a root but potato is a stem. Vegetative propagation of stems:  Potato time lapse  - Tubers/bulbs/runners/rhizomes Ginger - rhizome - hor...

 Video:  https://www.youtube.com/watch?v=SZ3BZBBC-Qc

Videos: https://www.youtube.com/watch?v=a-uF50BgMGM https://www.youtube.com/watch?v=CWFyxn0qDEU https://www.youtube.com/watch?v=SHFfnBovflo Dirty blood => deoxygenated blood. Clean blood => oxygenated blood. Each artery takes blood away from the heart(each of them carries clean blood except pulmonary artery which takes dirty blood from heart to lungs). Each vein takes blood to the heart(each of them carries dirty blood except pulmonary vein which takes clean blood from lungs to heart). Atriums(upper chambers) => receive blood. Ventricles(lower chambers) => pump the blood away. Heart: Right side(Atrium + Ventricle): to process dirty blood. Left side(Atrium + Ventricle): to process clean blood. Artery connections to the heart: Right side => Connected to exactly one Artery(Pulmonary) to send dirty blood to lungs. Left side => Connected to Aorta to send clean blood to the body and also connects to left and right coronary artery to send clean blood to heart muscle. Vein ...

Electromagnets in action: https://youtube.com/shorts/fe3s5Arks7I?si=3XUvn_3gkQchi6vO https://youtu.be/XBWy9gzGGd4?si=XF2CeJm_pgD1JFud

Light - Grade 7 - Youtube playlist for all these videos. Fire using convex lens . Reading glasses to ignite a fire. Spoon to light a fire. Myopia correction using concave lens. Hypermetropia correction using convex lens. concave/convex mirror online simulation Concave lens simulation . Convex lens simulation . Convex lens converges and concave lens diverges: https://www.youtube.com/shorts/FNqGJPVLkAk 1. Good demo of plane/convex/concave mirrors -  https://www.youtube.com/watch?v=oDNqfxRYQY0 1a. Another one:  https://www.youtube.com/shorts/lWGIMaMe1j4 2. Concave mirror demo using pendulum:  https://www.youtube.com/watch?v=3e-LZPHBA2M 3. Concave mirror projecting a real image -  https://youtu.be/fyYaDeTonVQ?si=sLBiCK5O9ib1x2Fq&t=117 4. Take a pencil close/away from spoon's inner surface and see when it becomes inverted/magnified? 5. Concave mirror for shaving:  https://www.youtube.com/watch?v=m7z60fO3qV8 6. Concave mirror inside torch light:  https://www....

1. Why is moist air less dense than dry air? 2. What does the phrase "in the eye of a storm" mean?

1. What are the advantages of managed/small scale wildfires in forests? Managed/planned animal hunting? 2. Where did drip irrigation originate? Why?

 Respiration in insects - Youtube video Epiglottis, Esophagus, Trachea co-ordination during swallowing and breathing video . Humans(and other animals) have evolved to have the trachea in front and esophagus at the back. Is this a good thing? Why? What would happen if they exchange their places, i.e. the trachea in back and esophagus at front? Why is right lung bigger than the left one? Since the left one has to give space to heart.

 Contour farming: Along the natural contours. Terrain should not be *very* steep. Terrace farming: Needs complex construction. Very steep terrain. For tomatoes and pulses, well draining loamy soil is good as excess waterlogging causes rot in them. Similarly for cotton(loamy/sandy). Loamy soil supports the widest variety of crops due to the right balance of nutrients and water drainage.

1. Why do the elephants strip the bark off the trees ? 2. Toucan feet (2 toes front, 2 back) 3. More common pattern in birds: 3 toes front, 1 back:  4. Cheek pouches:

Question: 1. Can you identify similarities between the "Rock cycle" and "Nutrition process"? For e.g. Sedimentary rocks are made up of sediments which have also come from the existing rocks. Similarly can we think of grinding/chewing of food as creating sediments?

Notes: 1. How to derive relationship between Centigrade and Fahrenheit? Start with  y = mx + b and you have 2 points (0,32) and (100,212). 2. Why mercury isn't allowed in airplanes ? 3. Why is there a "kink" in mercury thermometers ? 4. C linical thermometers have a kink to prevent mercury from going back. Can I use the same thermometer design with alcohol? Will it work? 5. What will happen if the inner walls of the thermos don't have the reflective coating? 6. A heater with reflector design to direct heat to a certain area.