BiotechBhanu · Class 4-5
Sookhe se ladne wala beej kaise banta hai?
Ek paudha bahut anaaj deta hai par paani bahut maangta hai. Doosra kam paani mein tik jaata hai par anaaj kam deta hai. Kya dono ki khoobi ek beej mein aa sakti hai?
Socho pehle… phir dekho jawab
Haan, aa sakti hai! Scientists do paudhon ka mel (cross) karwaate hain. Unke naye paudhon mein se woh chunte hain jisme dono khoobiyan hon. Ise plant breeding kehte hain.
Ek paudhe ke phool ka parag (pollen) doosre paudhe ke phool tak pahunchaya jaata hai. Isse jo beej bante hain, unme dono maa-baap paudhon ki kuch-kuch khoobiyan aati hain.
Cause-effect: har naya paudha thoda alag hota hai. Scientists unhe kam paani mein ugaakar dekhte hain. Jo kam paani mein bhi achha anaaj de, uske beej aage badhaaye jaate hain. Aisa kai saal tak hota hai, tab ek naya majboot beej taiyaar hota hai.
Kyun zaroori? Andhra Pradesh mein is saal June se August tak sirf 197.6 mm baarish hui, jabki aam taur par 424.3 mm hoti hai. 688 mein se 388 mandal (block jaise ilaake) sookhagrast ghoshit hue. Aise saal mein kam paani wali fasal aur majboot beej kisan ki badi madad hain.
Ghar pe try karo
Bade ke saath teen katori lo, har ek mein geela kapda aur 5 moong. Pehli ka kapda roz geela karo, doosri ka ek din chhod kar, teesri ka sirf pehle din. Chaar din tak table banao: kitne beej jaage, jad kitni lambi?
Wow!
Ek naya beej banane mein kai saal lag jaate hain, kyunki har saal paudhon ko ugaakar parakhna padta hai!
Mummy-Papa ke liye
Aaj teen katori wala moong prayog bachche ke saath shuru kijiye aur roz table mein likhwaiye ki kitne beej jaage.
3 sawaal
- Do paudhon ka mel karwa kar naya beej banana kya kehlata hai?
Jawab dekho
Plant breeding. Do paudhon ke cross se nayi kism banana plant breeding hai.
- Parag (pollen) kahan se aata hai?
Jawab dekho
Phool se. Parag phool mein banta hai.
- Andhra Pradesh mein is saal June-August mein baarish kaisi rahi?
Jawab dekho
Aam se aadhe se bhi kam. 197.6 mm hui, jabki aam taur par 424.3 mm hoti hai, yaani aadhe se bhi kam.
NCERT se jodo: NCERT Class 5 EVS — beej, paudhe aur kisan; khet aur paani