The body senses, communicates and responds through nervous tissue. Neurons receive signals from receptors, process information in the brain and spinal cord, then transmit messages to muscles or organs, enabling quick and coordinated responses to stimuli.
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Agrobacterium tumefaciens is a bacterium that causes crown gall disease in plants by transferring genetic material into plant cells. Scientists use it in genetic engineering and tissue culture to introduce useful genes into crop plants successfully.
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.
Meristematic cells lack vacuoles because they divide continuously and need dense cytoplasm for active metabolism. Large vacuoles would occupy space and reduce the efficiency of rapid cell division required for plant growth and tissue formation.
In multicellular organisms, similar cells form tissues, tissues combine to form organs organs work together as organ systems and organ systems form an organism. This hierarchical organisation ensures proper coordination, efficient functioning and successful performance of complex life activities.