In the straight-leg jump, ankles, knees and hips remained stiff and less flexible. In the normal jump, knees and ankles bent naturally while hips flexed slightly, helping absorb shock, maintain balance and produce smoother, safer movement.
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The correct option is (ii) hinge joint. Hinge joints allow movement mainly in one direction, like bending and straightening. Knees and ankles function similarly to door hinges, providing controlled movement and stability during walking, running and jumping.
A. (iii) Assertion true, Reason false. B. (i) Both true, Reason explains Assertion. C. (iv) Assertion false, Reason true. D. (iii) Assertion true, Reason false. These answers depend on tissue structure, muscle function and joint movement characteristics.
As the number of annual rings increases, the diameter of the teak tree also increases. Annual rings form each year due to lateral meristem activity, showing that tree girth grows gradually with age and environmental conditions.
Lateral meristem is the specialised tissue responsible for increasing stem girth. It is located along the circumference of stems and roots, where actively dividing cells continuously produce new tissues, increasing thickness and forming annual growth rings.