Mehak Arora Dropper Sample

Sanity: I'm the person who writes about sleep, so, sleep. In my year I lost it for two months and everything else fell apart. A drop year has a lot of hours but they only work if your brain does. Also have one adult who is not your parent that you can speak to honestly. For me it was an aunt. Not to solve anything, just to say "today was hard".

2d ago

that reframing "we check it together" is really helping, I'll try it tomorrow. And the sleep reminder too, I needed it

3d ago

For insulin, E. coli can just make the whole thing: you put the gene for the insulin precursor (proinsulin) into E. coli, and the bacterium then trims the C peptide away automatically, just like our body does, and you get mature insulin directly. So the A and B chains are just a diagram thing.

3d ago

Cattle egret and cattle: cattle graze and disturb insects from the grass, the egret feeds on those insects, so the egret benefits (+) and the cattle are neither benefited nor harmed (0). That is commensalism. Write that and you're safe. The similar-looking trap is "cattle and cattle egret = mutualism", which is wrong because the cattle don't gain anything noticeable.

4d ago

Hack 3 is the one I need everyone to read. I tried the sleep-less-to-study-more thing during my first attempt and it fed my anxiety. Sleep is not a luxury. Rohan, I'm glad you said it in a funny way, because people listen to funny.

4d ago

DDT: it's an organochlorine, a stable molecule. The C–Cl bonds and aromatic rings make it hard for soil microbes to break it down. It's also fat-soluble (non-polar) rather than water-soluble. So it doesn't wash away, it accumulates in fatty tissues of animals and gets more concentrated at each step up the food chain, which is biomagnification. That's one of the reasons it was banned or restricted in many places.

4d ago

Phenol tests. Neutral $FeCl_3$ gives a violet (blue-violet) colour with phenol because the phenolic OH forms a coloured iron complex; simple alcohols don't give it. Bromine water: the –OH group strongly activates the benzene ring toward electrophilic substitution, so phenol reacts with bromine water without any catalyst and gives a white precipitate of 2,4,6-tribromophenol, and the bromine water is decolourised. Another tip: phenol is acidic enough to dissolve in NaOH, but it's weaker than carbonic acid so it doesn't react with NaHCO3, while a carboxylic acid does.

4d ago

I got confused by this for a long time. A tip: don't aim for perfect intervals. If you miss a day, just do the revision as soon as you can. A late revision is still better than none.

5d ago

Why half filled and full filled are stable (the part sir skipped): in a half-filled or fully-filled subshell the electrons are symmetrically distributed, which gives extra stability, and the electrons with parallel spins in the same subshell can exchange positions, giving **exchange energy** that lowers the energy. The more exchanges possible (like in $d^5$ with five parallel spins), the larger the stabilisation. For Cr and Cu, 4s and 3d energies are so close that moving one electron from 4s to 3d is paid for by this extra stability.

5d ago

Your two (Solanaceae and Liliaceae) are correct, Sara! Add a bit: - **Solanaceae**: flowers actinomorphic and bisexual, sepals united and persistent, corolla united, 5 stamens **epipetalous** (attached to the petals), ovary superior, bicarpellary, placed obliquely with swollen placentae, fruit = berry or capsule. Potato, tomato, brinjal, chilli, Datura, tobacco, petunia. - **Liliaceae**: monocots, **perianth of 6 tepals** in 2 whorls, 6 stamens, ovary superior and tricarpellary with 3 chambers, fruit capsule. Onion, garlic, Aloe, Lilium, Colchicum.

5d ago

yes sorry I wrote that from memory, thanks for the fix rahul bhaiya

6d ago

For diet I just remember "habilis = handy man, a meat eater who used tools". Erectus was a bigger-brain meat eater (900 cc), Neanderthal had the biggest brain of the three at 1400 cc. Mnemonic with the numbers: 650-800, 900, 1400 going up.

6d ago

Your table "what I told myself vs what was happening" is painfully true. I told myself the same things. Also telling your teacher to rearrange the test series is so brave, I would have thought it was impossible.

6d ago

Reading this at 2 pm after a bad sleep night and it made the day feel less heavy. The night page with no book is going into my routine, thank you.

7d ago

I don't understand git at all but the "save game" idea made me feel calmer about my own notes. I lose files too. thank you for writing this simply 💛

7d ago

Amphibia details so you don't need to search: alimentary canal, urinary and reproductive tracts open into a common chamber called the **cloaca**, which opens to the exterior. Fertilisation is external, they are oviparous, and development is direct or indirect (tadpole in frogs). Eyes have eyelids, and the ear is represented by a tympanum. Examples: Rana, Bufo (toad), Hyla (tree frog), Salamandra and Ichthyophis (limbless amphibian).

7d ago

For counting particles, K₄[Fe(CN)₆] gives 4 K⁺ ions, so i = 4. The complex ion is one unit so it doesn't count separately, it just stays together like one block... I think the 4 is from potassium only. That's how I did it in the last two tests and I got those right by luck maybe?

8d ago

the sleep point is so underrated. when i started sleeping before 12 my panic attacks before tests reduced a lot. it's not magic but the brain really does behave differently. happy for you rohan

8d ago

It also helps to put the dates somewhere you see them: prelims, practicals, each paper, NEET. Seeing the actual calendar made my panic smaller. It's easy to feel like it's "all at once" but it's actually a sequence.

8d ago

Thank you so much, the two lines of defence idea is easy to remember. Now I can finally try to sleep 😴

9d ago

Totally fair, Dev. I said at the end I'm not telling everyone to delete everything. If it's a tool for you, use it as a tool. For me, it was mostly a place to hide. "Be deliberate" is the same thing I ended up with.

9d ago

Rohan, 7 hours is the "before" me. Start with one rule: phone outside the room at night. Just that. Don't delete anything yet.

9d ago

Thank you for saying the breakfast thing out loud. I did the same in the first half of my year, no breakfast, half a lunch, and then my sleep and my panic both got worse and I thought it was "just anxiety". It was partly anxiety and partly I was running on nothing. A doctor told me to eat three proper meals before we even talk about anything else. Please nobody cut the food line, cut the outings or the printouts first.

9d ago

Zoya di you always know what to say 🥺 Thank you. That day-9 thing was the first time I looked at the pattern instead of the screen.

10d ago

Roles, one by one, the way I revise them: - Insulin: lowers blood glucose. It's a polypeptide of 51 amino acids in two chains (A with 21, B with 30) joined by disulphide bonds. Not enough insulin is diabetes mellitus. - Glucagon: raises blood glucose by breaking down glycogen. Opposite of insulin. - Thyroxine: controls basal metabolic rate. - Adrenaline: "fight or flight", raises heart rate and blood pressure. - Cortisol: glucocorticoid, regulates carbohydrate metabolism and stress response. - Aldosterone: mineralocorticoid, regulates sodium and water balance. - Testosterone / estradiol / progesterone: development of male / female characters and reproduction. - Oxytocin: uterine contractions in childbirth, and milk ejection.

10d ago

as someone who struggles to eat properly when stressed, "eating properly makes me less irritable" hit home. i'm going to try the egg bhurji on sundays, cooking feels calming for me

12d ago

This is nice, Tanvi. One small request for the "festival and health" side of things: firecracker noise at night was the biggest thing that broke my sleep last Diwali, and the next three days were rough. I now use earplugs and a fan sound, and I tell my family to please not wake me for little things. If you're anxious like me, plan your sleep around the loud days.

13d ago

oops 😅 thanks for correcting me, I was reading only the gland name in the table and not the line below it

13d ago

I think the assertion is true and the reason is also true. Posterior pituitary = neurohypophysis, and NCERT lists oxytocin and vasopressin as its hormones, so it makes them. Exams just follow NCERT. Isn't that correct?

13d ago

Small side point because I kept losing it: 100–1000 *litres* is NCERT's number for the bioreactors, so don't write mL. And the reason for larger volume is simply yield: a flask gives you too little product to supply to a market. The reason you can't just keep increasing flask size is the oxygen supply and temperature/pH control, which bioreactors are designed to handle.

13d ago