Question

2. Name the hormone that helps in the metamorphosis of insects.
Juvenile hormone
3. Calculate the calorific value of 5 kg of wood which produces 85,000 kilojoules of energy.
4. Define seismograph.​

Answer 1

Answer:

2.Insect molting and metamorphosis are controlled by two effector hormones: the steroid 20-hydroxyecdysone and the lipid juvenile hormone (JH) (Figure 18.21). 20-hydroxyecdysone initiates and coordinates each molt and regulates the changes in gene expression that occur during metamorphosis.

4.A seismograph, or seismometer, is an instrument used to detect and record earthquakes. Generally, it consists of a mass attached to a fixed base. During an earthquake, the base moves and the mass does not. The motion of the base with respect to the mass is commonly transformed into an electrical voltage.