Respiratiory Quotient (RQ) value of tripalmitin is:
AI-generated explanation. Check against your textbook.
Explanation:
RQ = CO2 evolved / O2 consumed during respiration. For fats (like tripalmitin, a triglyceride), RQ is about 0.7, as fats yield more energy with less CO2 per O2 consumed. Therefore, the RQ value of tripalmitin is 0.7 (option 3).
🧠 Did You Know?
Carbohydrates have RQ ≈ 1.0, proteins ≈ 0.8, and fats ≈ 0.7. Lipids produce less CO2 per O2 used compared with carbohydrates.
💡 NCERT Memory Line:
RQ of carbohydrates is about 1.0; fats give about 0.7; proteins around 0.8—these values help identify fuel utilization in cellular respiration.
It takes very long time for pineapple plants to
produce flowers. Which combination of hormones
can be applied to artificially induce flowering in
pineapple plants throughout the year to increase
yield?
Tidal Volume and Expiratory Reserve Volume of an
athlete is 500 mL and 1000 mL respectively. What
will be his Expiratory Capacity if the Residual
Volume is 1200 mL?
AI-generated explanation. Check against your textbook.
Explanation:
Expiratory capacity (EC) is the total amount of air that can be expired after a normal breath, i.e., EC = Tidal Volume (TV) + Expiratory Reserve Volume (ERV). Here TV = 500 mL and ERV = 1000 mL, so EC = 500 + 1000 = 1500 mL. Residual Volume is not used in EC calculation.
🧠 Did You Know?
EC does not include RV; it only sums the air that can be forcefully expired after a normal breath.
💡 NCERT Memory Line:
EC = TV + ERV; TLC = IRV + TV + ERV + RV; VC = TV + IRV + ERV.
Which would be the heart rate of a person if the
cardiac output is 5L, blood volume in the ventricles
at the end of diastole is 100 mL and at the end of
ventricular systole is 50 mL?
AI-generated explanation. Check against your textbook.
Explanation:
Cardiac output (CO) = heart rate (HR) × stroke volume (SV). SV = end diastolic volume − end systolic volume = 100 mL − 50 mL = 50 mL = 0.05 L. Given CO = 5 L/min, so HR = CO/SV = 5 L/min ÷ 0.05 L = 100 beats per minute. Therefore, option 2 is correct. The other options would require different SV values: 50 bpm would need SV = 0.1 L, 75 bpm would need SV ≈ 0.0667 L, 125 bpm would need SV ≈ 0.04 L. NCERT emphasizes CO = HR × SV in normal heart function.
🧠 Did You Know?
Stroke volume depends on preload (EDV), afterload, and contractility. EDV here is the amount of blood in the ventricle at the end of diastole.
💡 NCERT Memory Line:
CO = HR × SV, where SV = EDV − ESV; use given CO and EDV/ESV to find HR.