Compare photosynthesis and respiration — Hinglish notes

2.7.12 · Biology › Photosynthesis

HAR process KYA hai

Hum formulas seedha nahi daalenge. Hum inhe conservation of atoms + energy direction se build karenge.

Step 1 — kya andar jaata hai, kya bahar aata hai (photosynthesis). Plants ko ek carbon source ( $C O_{2}$ ), ek hydrogen/electron source (water), aur energy (light) chahiye. Product sugar hai. Target ke roop mein glucose $C_{6} H_{12} O_{6}$ lo.

Glucose mein 6 carbons hain → $6 C O_{2}$ chahiye. Kyun? Carbon balance hona chahiye.
Glucose mein 6 O hain, lekin hum $O_{2}$ bhi release karte hain. O ko dhyan se track karo → andar $6 H_{2} O$ aur bahar $6 O_{2}$ chahiye.

$6 C O_{2} + 6 H_{2} O light C_{6} H_{12} O_{6} + 6 O_{2}$

Atoms check karo: C: $6 = 6$ ✓; H: $12 = 12$ ✓; O: $18 = 6 + 12$ ✓.

Step 2 — respiration is this reversed. Energy bahar nikalni hai, toh arrow ulta karo: glucose ko $O_{2}$ ke saath todo.

$C_{6} H_{12} O_{6} + 6 O_{2} \to 6 C O_{2} + 6 H_{2} O + energy (ATP)$

Figure — Compare photosynthesis and respiration

Side-by-side comparison

Feature	Photosynthesis	Respiration
Energy	Light energy store karta hai	Chemical energy release karta hai
Type	Anabolic (glucose banata hai)	Catabolic (glucose todta hai)
Gases in	$C O_{2}$	$O_{2}$
Gases out	$O_{2}$	$C O_{2}$
Water	Reactant (use hota hai)	Product (banta hai)
Organelle	Chloroplast	Mitochondrion
Kahan hota hai	Sirf chlorophyll wali cells mein	Sabhi living cells mein
Kab	Light chahiye (din mein)	Hamesha (din aur raat)
Glucose	Product	Reactant

Worked examples

Common mistakes (Steel-manned)

Flashcards

Which process stores energy, photosynthesis or respiration?

Photosynthesis (light energy ko glucose ke roop mein store karta hai).

Which process releases energy as ATP?

Respiration.

Write the overall equation for photosynthesis.

6 C O_{2} + 6 H_{2} O l i g h t C_{6} H_{12} O_{6} + 6 O_{2}

Write the overall equation for respiration.

C_{6} H_{12} O_{6} + 6 O_{2} \to 6 C O_{2} + 6 H_{2} O + energy

Which organelle does photosynthesis?

Chloroplast.

Which organelle does respiration?

Mitochondrion.

Which cells carry out respiration?

Sabhi living cells.

Which cells carry out photosynthesis?

Sirf chlorophyll wali cells (jaise plant leaf cells).

Is photosynthesis anabolic or catabolic?

Anabolic (yeh glucose banata hai).

Is respiration anabolic or catabolic?

Catabolic (yeh glucose todta hai).

At night, what is the net gas exchange of a leaf?

O_{2}

leta hai,

C O_{2}

deta hai (sirf respiration hoti hai).

What is the compensation point?

Woh light level jahan photosynthesis rate respiration rate ke barabar hoti hai, toh net gas exchange zero hota hai.

Why aren't the two processes perfect reverses of each other?

Yeh alag multi-step pathways use karte hain aur energy heat ke roop mein lose hoti hai (thermodynamics ka 2nd law).

Recall Feynman: explain to a 12-year-old

Socho ek rechargeable battery. Sunlight battery ko charge karti hai — yeh hai photosynthesis, plant energy ko sugar mein pack karta hai. Phir koi bhi living thing — plant ya animal — usi charged battery ko use karta hai move karne, grow karne, aur warm rehne ke liye; use khatam karna respiration hai, jo usi cheez (carbon dioxide aur water) ko bahar karta hai jo plant ne pehle use ki thi. Toh ek battery fill karta hai, doosra use khaali karta hai — yeh chakkar hamesha chalta rehta hai.

Connections

Light-dependent reactions — photosynthesis ka pehla half
Calvin cycle — jahan $C O_{2}$ glucose banta hai
Aerobic respiration — glucose + $O_{2}$ → ATP
Mitochondria vs Chloroplasts — dono energy organelles
ATP as energy currency — jo respiration ultimately banata hai
Carbon cycle — yeh dono processes global carbon flow drive karti hain
Limiting factors in photosynthesis — light, $C O_{2}$ , temperature