A, B , C and D are all various types of fibres. The fibres A and B are animal fibres whereas C and D are plant fibres. The yarn made from ‘ A’ is used for knitting sweaters and the yarn made from ‘B’ is used for weaving sarees. Fibre ‘ C’ is used for filling mattresses and fibre ‘ D’ is used for making ropes. Identify the four fibres.

Aneuron is stimulated with an electric pulse. the action potential is detected at a point 3.70 cm down the axon 0.0052 s later. when the action potential is detected 7.20 cm from the point of stimulation, the time required is 0.0063 s. what is the speed of the electric pulse along the axon? (why are two measurements needed instead of only one? )

An example of internal feedback working to maintain homeostasis is your a. decreased respiration rate when you are studying b. decreased heart rate when you are sad c. increased respiration rate when your muscles need more oxygen d. increased heart rate when your lungs need more oxygen

Which of the following would be a body response when stepping outside without a coat on a snowy day? a. senaceous glands. secrete more senum b. more liquid is transported by the body to the skin fir insulation c. blood vessels in the skin narrow and contract d. blood vessels in the skin expand