STD 11 - 17. Locomotion and movement — BIOLOGY STD 11 Science — Question

$(I)$ Humidity in atmosphere is relatively more in the area where light become limiting factor for plants

$(II)$ Increase in light as factor affecting photosynthesis beyond a point causes breakdown of chlorophyll and a decrease in photosynthesis occurs

$(III)$ The $C_4$ plants respond to higher temperatures and show higher rates of photosynthesis while $C_3$ plants have a much lower temperature optimum

$I.$ Myosin head binds to the exposed active site on action to form a cross bridge

$II.$ The Z-line attached to these actin are also pulled in wards there by causing shortening of sarcomere also called contraction

$III.$ This pulls the attached actin filaments towards the centre of $A$-band The correct option is