ParyavaranBhanu · Class 4-5
Sau saal ka intezaar: ghaas ke maidan ki kahani
Agar ek puraana ghaas ka maidan ujad jaaye, toh dobara ghaas ug jaane se kya woh pehle jaisa ho jaata hai?
Socho pehle… phir dekho jawab
Nahi. Ek naye adhyayan ke mutabik dobara ugne wali ghaas ke paudhe pehle se alag hote hain — kam kism ke, aur bahar ke jhaad-jhankhaad jaise. Puraane maidan ko wapas aane mein sau saal se zyada lag sakta hai.
Ghaas ke maidan bahut kaam ke hote hain: yahan pashu chaara khaate hain, aur chidiyaan aur keede rehte hain. Vaigyanik kehte hain ki duniya ki zameen ka jitna carbon hai, uska lagbhag ek-tihai hissa ghaas ke maidan sambhaalte hain.
Cause-effect: jab puraana maidan ujad jaata hai, mitti ke poshak tatva aur pH badal jaate hain. Isliye jo ghaas dobara ugti hai woh lambi hoti hai, kam kism ki hoti hai aur usme bahar ke halke paudhe zyada hote hain. PNAS adhyayan mein 742 paudhon ki kismon ki tulna ki gayi.
Ek asli misaal: ghaas ke maidan ko dobara sanjone se kuch jaanwar lautte hain — Solapur mein Godawan, Kutch mein lesser florican aur Assam ke Orang mein pygmy hog. Par asli puraana paudhon wala maidan wapas nahi aata, isliye bachana pehle zaroori hai.
Ghar pe try karo
Bade ke saath park mein ek dori se 1 metre ka chhota ghera banao. Uske andar kitni alag kism ke paudhe aur keede dikhte hain, gino aur likho. Kuch todna ya pakadna nahi.
Wow!
India ke paas duniya ke lagbhag 15% pashu hain, par zameen sirf lagbhag 4% — isliye ghaas ke maidan bahut zaroori hain!
Mummy-Papa ke liye
Aaj bachche ke saath dori se 1 metre ka ghera banakar ginwaiye ki kitni kism ke paudhe aur keede dikhe, bina kuch toode.
3 sawaal
- Ujde ghaas ke maidan ko puraane jaisa hone mein kitna waqt lag sakta hai?
Jawab dekho
Sau saal se zyada. Adhyayan ke mutabik ismein sau saal se zyada lag sakta hai.
- Dobara ugi ghaas mein kya alag hota hai?
Jawab dekho
Kam kism ke paudhe hote hain. Dobara ugi ghaas mein kism kam hoti hain aur bahar ke paudhe zyada.
- Ghaas ka maidan duniya ki zameen ka lagbhag kitna carbon sambhaalta hai?
Jawab dekho
Ek-tihai. Vaigyanik kehte hain ki lagbhag ek-tihai zameeni carbon ghaas ke maidan mein hai.
NCERT se jodo: NCERT Class 5 EVS — hamare aas-paas ke paudhe, jaanwar aur zameen