Stories, questions and ideas from students.

questions

• Zoya Khan12thSample· 1mo ago

  Why does a potentiometer measure emf better than a voltmeter, and what actually increases its sensitivity?

  A question about balance points, driver cells and a gradient I cannot picture.

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• Diya Menon11thSample· 1mo ago

  Why 2S/r for a drop but 4S/r for a soap bubble, and which way does mercury go in a capillary?

  omg I love this chapter and I hate it. 😭 Excess pressure inside a liquid drop is \dfrac{2S}{r} and inside a soap bubble it's \dfrac{4S}{r} . Our teacher says the soap bubble has "two surfaces". But my brain says a bubble

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• Ananya Reddy11thSample· 1mo ago

  Why do oxides go from basic to acidic across a period, and why are CO and NO called neutral oxides?

  I colour-coded the oxide trend for period 3 in my notes: blue for basic Na2O, MgO , green for amphoteric Al2O3 , red for acidic SiO2, P4O10, SO3, Cl2O7 . NCERT states the trend but I want to understand the reason, becaus

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• Meera Patel11thSample· 1mo ago

  Frog's three-chambered heart, portal systems and excretion, is my understanding of Rana tigrina correct?

  I've been through the frog section of Structural Organisation in Animals twice and I want to verify the parts that need reasoning, not just terms. This is what I understood, please correct anything. Digestion: short alim

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• Yash Tiwari11thSample· 1mo ago

  Kjeldahl percentage nitrogen comes out half of the key, and why does Dumas work for nitro compounds but Kjeldahl doesn't?

  bhai raat ke 1 baj rahe hain aur mera numerical nahi ban raha, so asking here. Question I was solving: 0.5 g of an organic compound was Kjeldahl digested, ammonia evolved was passed into 15 mL of 0.1 M H 2SO 4 , and the

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• Mehak AroraDropperSample· 1mo ago

  Photoperiodism: is it the day length or the night length that matters? And the flash of light in the dark confuses me

  Writing this at 1 am because I can't sleep and apparently neither can my confusion 🙈 Photoperiodism, from NCERT: some plants need a certain light-dark cycle to flower. Short-day plants SDP flower when the day length is l

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• Ananya Reddy11thSample· 1mo ago

  Where exactly are root hairs vs meristem vs root cap, and why is a monocot root system "fibrous"?

  I just finished colour-coding the root chapter in Morphology of Flowering Plants and then looked at my own diagram and I have no idea whether I drew it correctly. What I wrote from NCERT: four regions in the root tip. Ro

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• Nisha Verma12thSample· 1mo ago

  Ploidy of gametes and zygote in different organisms, parthenogenesis, and why external fertilisation needs so many eggs

  Boards are done in my head and NEET mode is on, so I'm redoing Reproduction in Organisms with proper diagrams. The sexual reproduction events section has three things I can't line up. 1. NCERT says gametes are always hap

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• Sara Fernandes11thSample· 1mo ago

  If the Casparian strip blocks the apoplast at the endodermis, why bother with the apoplast pathway at all?

  I was revising after football practice today muddy knees and all and got stuck on water uptake by roots, which I thought was an easy chapter. NCERT: water moves in the root by two pathways, the apoplast through the cell

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• Aarav Kulkarni11thSample· 1mo ago

  Mendeleev put tellurium before iodine despite higher atomic mass, so how did he justify it and what did Moseley change?

  Doing the Genesis of Periodic Classification part of NCERT and my notes are a mess. I have Dobereiner's triads, Newlands' octaves, Lothar Meyer's curve, Mendeleev and Moseley all squeezed on one page and I keep mixing up

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• Yash Tiwari11thSample· 1mo ago

  Plants have no lungs, so how does O2 reach the cells of a thick trunk or a deep root for respiration?

  bhai doubt in Respiration in Plants. NCERT says plants have no specialised organs for gaseous exchange and "each plant part takes care of its own needs". Samajh nahi aaya kaise. Like a thick tree trunk or a root deep in

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• Diya Menon11thSample· 1mo ago

  Current has a direction but is called a scalar. Which quantities are really vectors, then?

  Ahh I need help with a silly doubt that is not so silly. Motion in a Plane, scalars and vectors. NCERT says a vector has magnitude and direction. But current also has a direction we show the arrow in circuits! and yet it

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