During contraction, what changes would you expect to see in the various lines, bands, and zones of the sarcomere, on the basis of the sliding filament hypothesis?

During muscle contraction, what could be the correct sequence ? A. Release of calcium ions into the sarcoplasm. B. Release of Acetylcholine. C. Sliding of actin filaments over each other. D. Break down of ATP to form a cross bridge.

Given below is the diagram of an experimental set-up to study the process of transpiration in plants. Study the same and then answer the questions that follow : After about half an hour what change, if any, would you expect to find in the cobalt chloride papers placed on the dorsal and ventral sides of the leaf? Give a reason to support your answer.

What happens to the l band and H zone during contraction? Do the lengths of the thick and thin filaments change ?

Statements A-bands of the muscle are dark and contain myosin I-band are the light bands and contain action During muscle contration the A-band contracts The part between the two Z-lines is called as saromere The central part of thin filament, not over-lapped by thick filament is called H-zone of the above statements.

A radioactive substance is oxidised. What changes would you expect to take place in the nature of radioactivity ? Explain your answer.

Look at the figure and answer the following questions. (a) What change would you observe in the calcium hydroxide solution taken in tube B ? (b) Write the reaction involved in test tubes A and B respectively. (c ) If ethanol is given instead of ethanoic acid, would you expect same change ? (d) How can a solution of lime water be prepared in the laboratory ?

Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?

What would be the maximum number of emission lines for atomic hydrogen that you would expert to see with the naked eye if the only electronic energy involved are those as shown in figure ?

The steps involved in the mechanism of muscle contraction are given below. Arrange the steps in proper sequential order and select the correct option. I. Release of calcium ions in the sarcoplasm. II. Signal sent by the CNS via a motor neuron. III. Binding of calcium with a subunit of troponin on actin filaments. IV. Generation of the action potential in the sarcolemma. V. Binding of myosin head to the exposed active sites on actin to form a cross-bridge. VI. Inward pulling of ‘Z’ line attached to actin causing shortening of the sarcomere. VII. Pulling of the attached actin filaments towards the centre of 'A' band. VIII. Release of neurotransmitter acetylcholine and generation of the action potential in the sarcolemma.