A. An enzyme that digest endocuticle during an arthropodal ecdysis B. A newly formed exoskeleton in authropods C. A hormone that regulates moulting in arthropods D. A process that involves moulting
A. It permits gaseous exchange B. It contains joints, for the same purpose as present in human skeletal system C. It provides muscle attachment D. Like all the other types of exoskeleton, they lack sensation
A. They are surrounded by single or double pieces of hard skeleton. B. Their shell grows as the animal grows. C. They have hydrostatic skeleton. D. They move by tube feet
A. Positive phototropism and negative geotropism B. Negative phototropism and positive geotropism C. Negative tactic movement and positive tropic movement D. Positive geotropism of stem and roots
