Question 12 Marks
Moist germinated seeds were placed in a thermos flask $A,$ and germinating seeds, which were boiled and then soaked in$5$ percent formalin, were placed in thermos flask $B$. Thermometers were inserted in the flask and the mouth of each flask plugged with moist cotton wool. The two flasks were fixed upside down as shown in the fig. $10.9.$ The temperature on both thermometers was noted. After about $48$ hours, the temperature in
flask A was found to be much higher than that in flask $B$.
$(a)$ State the object of using the apparatus..
$(b)$ Explain, why a rise in temperature occurs in flask $A$
$(c)$ If 5 percent formalin was not used after boiling the seeds, the temperature of flask $B$ would have risen considerably. Explain.
flask A was found to be much higher than that in flask $B$.
$(a)$ State the object of using the apparatus..
$(b)$ Explain, why a rise in temperature occurs in flask $A$
$(c)$ If 5 percent formalin was not used after boiling the seeds, the temperature of flask $B$ would have risen considerably. Explain.
Answer
View full question & answer→$(a)$ To show that heat is evolved during respiration
$(b)$ In flask A, moist seeds respire and produce heat that increases the temperature.
$(c)$ If formalin was not used, bacteria will grow on the dry seeds and respire anaerobically to produce a little heat.
$(b)$ In flask A, moist seeds respire and produce heat that increases the temperature.
$(c)$ If formalin was not used, bacteria will grow on the dry seeds and respire anaerobically to produce a little heat.