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Start learning 50% faster. Sign in nowOrders Odonata and Ephemeroptera exhibit Paleopterous wing conditions, lacking the wing-flexing mechanism found in Neoptera. Neopterous: Wings capable of folding over the back, providing flexibility; common in most living insects. Paleopterous: Lack wing-flexing mechanism, wings unable to fold flat over the back; found in orders like Odonata and Ephemeroptera. Importance lies in evolutionary adaptations and relationships among insect groups.
A boat covers 45 km downstream in 2 h and the same distance upstream in 10 h. Find the speed (in km/h) of the boat in still water.
A boat covers 12 km upstream and 20km downstream in 4 hours while it covers 20km upstream and 12 km downstream in 4*1/2 hours. What is the velocity of c...
A boat can travel 80 km downstream in 4 hours and the same distance upstream in 8 hours. If the speed of the boat in still water is increased by 50%, ho...
A takes 3 hours more while swimming upstream than downstream. His speed in still water is 12 km/hr. The speed of stream is 4 km/hr. What is the distance?
A boy can swim a certain distance downstream in 4 hours and return in 7 hours. If the rate of stream is 6 kmph then what is the speed of boy in still wa...
A boat traveled a distance of 135 km from point 'A' to point 'B' and then returned to point 'A,' completing the entire journey in 54 hours. The boat's s...
