Doosre Jaanwaron mein Saans
Class 7 Science · Chapter 9: Jaanwaron mein Jeevan Prakriyaayein · NCERT Curiosity section 9.2.2
Seekho
Pakshi, haathi, sher, gaay, chhipkali aur saanp sab phephdon se saans lete, par unke phephde alag bane. Zyaadatar jaliya jaanwar, jaise machhli, ke galphade (gills) hote, rakt vaahikaaon se bhare, jo paani mein ghuli oxygen lete aur carbon dioxide chhodte.
Mendhak badhte hue badalte: tadpole galphadon se saans lete; bade mendhak zameen par phephde aur paani mein nam tvacha use karte. Kenchua bhi nam tvacha se saans leta, isliye mitti mein paani bharne par upar aata. Har jaanwar ki saans uske aavaas ke hisaab se.
Explore: har jaanwar kaise saans leta?
- Har jaanwar sort karo.
Yaad rakho
- Zameeni jaanwar phephde; machhli paani mein ghuli oxygen ke liye galphade.
- Tadpole galphade; bade mendhak phephde aur tvacha; kenchua nam tvacha.
Quick check
Paani mein baitha bada mendhak mukhyatah kisse saans leta?
- moist skin
- gills
- nostrils only
- stomach
Answer
moist skin. Zameen par phephde.
Socho
Machhli paani se bahar nikaalne par jaldi kyun mar jaati?
Ek answer
Iske galphade sirf paani se oxygen le sakte; hawa mein wo chipak kar sookh jaate, to oxygen nahi milti.
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.