In photosynthetic cells, synthesis of ATP by the chemi-osmotic mechanism occurs during photosynthesis and respiration. Plants can only achieve photosynthesis during the day and then respire during the night because photosynthesis requires the sun's energy to perform the necessary reaction to produce oxygen.
The correct answer is (B) Photosynthesis and diffusion from the air
Dissolved oxygen enters the water from photosynthesis and through air. The The aeration of water can be caused by wind. From the air oxygen diffuse into the water and gets mixed in the it through circulation. The oxygen is also produced as a waste product of photosynthesis from blue-green algae, phytoplankton, etc which is added in water.
D since democracy takes decisions from most or all of the people and it tends to be the most fair method.
Answer:
Na+ only
Explanation:
Depolarisation of membrane refers to the change in the resting membrane potential of the membrane of a cell which is usually -70mv to a more positive value.
This value changes when the positive ions move inside the cell which increases the positive charge inside the cell.
In the myocardial cell, the sodium ions move inside the cell which changes the potential towards the more positive side as a result of which the signals for contraction arises.
Thus, Na+ only is correct.
Our hypothesis is based on the performance of students in the tests given the amount of time they studied last night before the exam. The testable version of the hypothesis will be whether the students studying 20 minutes per night, every night, get higher scores on the test. To test the hypothesis, Mr. Montanari needs to do a survey of his students to find out the time of study and the duration of study before the examinations. By analysing and interpreting the data, he can either reject or accept the hypothesis. Hypothesis will get rejected:
1. when there's at least one case where the individual might have not studied before the examination but still managed to score the highest.
2. when there's at least one case where the individual might have studied in the day time but still managed to score the highest.
3. when there's at least one case where the individual might have studied for 20 minutes per night for every night but got an average score in the test.
