BiotechSurya · Class 2-3
Beej ke andar chhupi chitthi: DNA
Sonu ke dada ke khet mein do tarah ka chawal ugta hai: ek lamba aur khushboo wala, ek chhota aur jaldi pakne wala. Sonu ne dono ki baalein haath mein li aur poochha: 'Dada, mitti ek, paani ek — chawal alag kaise?'
Socho pehle… phir dekho jawab
Dada ne ek daana Sonu ki hatheli par rakha. 'Kyunki beej alag hain! Har beej ke andar ek bahut lambi, bahut patli chitthi hoti hai — uska naam DNA. Usme likha hai paudha kaisa banega: lamba ya chhota, khushboo wala ya nahi.'
Sonu ne daana tod ke chitthi dhoondhi, par kuch nahi dikha. Dada hanse, 'DNA har jeev ki har nanhi cell (koshika) ke andar hota hai — paudhe mein, gaay mein, tum mein. Yeh ek nirdesh-chitthi hai: "patte aise banao, daana aisa banao." Isliye aam se aam, gehun se gehun.'
Tabhi mummy aayi. Dada ne Sonu se poochha, 'Tumhari naak mummy jaisi aur aankhein papa jaisi kyun? Kyunki DNA ki chitthi mummy-papa se bachche tak aati hai — thodi mummy ki, thodi papa ki. Paudhon mein bhi beej apne maa-paudhe ki chitthi le kar aata hai.'
'Har kism (variety) ki apni chitthi,' dada bole. Sonu ne dono beej ek hi dibbe mein daal diye the. Dada ne unhe alag kiya aur alag-alag kapde ki potli mein bandh kar rakha: 'Ek potli khoyi, toh ek chitthi hamesha ke liye khoyi.' Sonu ne potliyon par naam likh diye.
Tum Sonu hote toh dada ke beej bachaane ke liye aur kya karte?
Humne kya kiya :- Dada ke do chawal se peeche jaakar beej ki chitthi (DNA) tak pahunche.
Isse kya hua :- Samjhe ki paudha kaisa banega yeh beej ke DNA mein likha hai, aur har kism ka beej bachaana zaroori hai.
Ghar pe try karo
Bade ke saath rasoi se do tarah ke chawal ya do tarah ki dal (jaise moong aur masoor) lo. Daane ko dekho: rang, aakaar, lambai. Copy mein dono ka chitra banao aur teen farak likho. Yeh farak unki chitthi (DNA) ka farak hai!
Wow!
Agar tumhari ek cell ka DNA seedha khola jaaye toh woh lagbhag do metre lamba hoga — aur woh itni nanhi cell mein mud kar baitha hai!
Mummy-Papa ke liye
Aaj bachche ke saath rasoi ke do alag chawal ya dal ke daane dekhiye aur poochhiye: 'Farak kahan se aaya?' Jawab: beej ki chitthi se.
3 sawaal
- Beej ke andar paudhe ki nirdesh-chitthi ka naam kya hai?
Jawab dekho
DNA. DNA har cell ke andar ki chitthi hai jo batati hai paudha kaisa banega.
- Ek mitti, ek paani — phir bhi do chawal alag kyun?
Jawab dekho
Beej ki chitthi (DNA) alag thi. Har kism ke beej ka DNA alag hai, isliye paudha aur daana alag.
- Tumhari naak mummy jaisi kyun hai?
Jawab dekho
DNA ki chitthi mummy-papa se aati hai. DNA mummy-papa se bachche tak aata hai, thoda mummy ka, thoda papa ka.
NCERT se jodo: NCERT Class 3 — hamare aas-paas: beej, paudhe aur parivaar (idea in words)