Neco Model Questions Vol1 2019 Biology Question 4

Practice practical question 4 from the 2019 Neco Model Questions Vol1 Biology examination. This question covers Respiration .

Neco Model Questions Vol1 2019 Biology Practical
Topic: Respiration
Question 4 NECO_MODEL_QUESTIONS_VOL1 • 2019 • BIOLOGY • practical

Students investigated the effect of temperature on the rate of respiration in germinating pea seeds using a closed respirometer. Each respirometer contained 0.5 g of freshly germinated peas, 50 mL of water and was sealed with a gas‑collecting syringe. The ambient temperature of the water bath was set at three values and the volume of gas collected after 10 min was recorded as follows: Temperature (°C) : 15  25  35 Collected gas (mL) : 12  20  28 Atmospheric pressure = 760 mm Hg. The water‑vapour pressures at the three temperatures are: 15 °C – 12.8 mm Hg, 25 °C – 23.8 mm Hg, 35 °C – 42.2 mm Hg. Answer the following questions:

Question Parts

( a )
Correct each measured gas volume for water vapour to obtain the dry CO₂ volume at each temperature.
( b )
Calculate the respiration rate expressed as mL CO₂ min⁻¹ g⁻¹ of tissue for each temperature.

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This is Neco Model Questions Vol1 2019 Biology Question 4. It is one of the practical questions from the 2019 Neco Model Questions Vol1 Biology examination.

The question covers Respiration .

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