Jaanwaron ka Jeevan Chakra
Class 6 Science · Chapter 10: Jeevit Praani: Unki Visheshtaayein · NCERT Curiosity section 10.5
Seekho
Baarish ke baad Divit ko taalaab mein jelly jaise ande milte hain. Hafte baad unse tadpole nikalte hain jo poonchh se tairte aur gills se saans lete hain. Dheere-dheere pair aate hain, poonchh jaati hai, wo chhote medhak bante hain, aur aakhir bade medhak jo zameen par bhi reh sakte hain.
Jeevan chakra mein shareer ke roop ka bada badlaav metamorphosis (kaayaapalat) kehlata hai. Titli bhi aisa karti hai: anda → illi → pupa → titli. Machchhar anda → larva → pupa → bada machchhar, aur unke ande aur larva ruke paani mein rehte hain.
Isiliye hum har hafte cooler, guldaan, purane tyres aur gamle khaali karte hain: ruka paani nahi to machchhar ka larva nahi, aur dengue-malaria kam. Jeevan chakra jaanna sehat bachaane mein madad karta hai!
Explore: jaanwaron ke jeevan chakra kram mein lagao.
- Medhak ka jeevan chakra kram mein lagao.
- Ab machchhar ka.
Yaad rakho
- Medhak: ande → tadpole → chhota medhak → medhak. Machchhar: anda → larva → pupa → bada.
- Ruka paani hataane se machchhar ka jeevan chakra toot-ta hai.
Quick check
Kis charan mein medhak ki poonchh hoti hai aur gills se saans leta hai?
- Tadpole
- Bada medhak
- Anda
- Pupa
Answer
Tadpole. Tadpole paani mein rehte, poonchh se tairte aur gills se saans lete hain.
Socho
Kuch jaanwar, jaise gaay aur insaan, metamorphosis se nahi guzarte. Is tarah bachhda tadpole se kaise alag hai?
Ek answer
Bachhda pehle se chhoti gaay jaisa dikhta hai aur bas bada hota hai. Tadpole bade medhak se bahut alag dikhta hai aur shareer ka roop poori tarah badalta hai.
Practice
Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.