Question
Write down disadvantages of crop rotation.
Write down disadvantages of crop rotation.
Disadvantages of crop rotation: Crops of the same family should not be repeatedly grown in the same field. This practice will promote build up of diseases and insect pests and decrease the similar nutrients from the soil.
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Write down four main characters of gymno-sperms.
If the relative density of a substance is 7.1, what will be its density in SI units?
A man drops a 10kg rock from the top of a 5m ladder. What is its speed just before it hits the ground? What is its kinetic energy when it reaches the ground? (8 = 10m/s2)
A heavy car A of mass 2000kg travelling at 10m/s has a head-on collision with a sports car B of mass 500kg. If both cars stop dead on colliding, what was the velocity of car B?
Give one point of difference between notochord and nerve cord.