B is prey predator
C is parasitism
A is commensalism
The correct answer is Vibration.
This is a condition in which there is a involuntary eye movement. In this the eye seems to be dancing eye and the vision is not clear. The vibration in eyes is due to consumption of alcohol. In normal condition the blinking of eyes is voluntary but due to consumption of alcohol the condition changes and the blinking of eyes becomes involuntary(neurological disorder).
The correct answers are :
The diffusion of Na+ ions into the cell is facilitated by the Na+ concentration gradient across the plasma membrane.
The diffusion of K+ ions out of the cell impeded by the electrical gradient across the plasma membrane
The electrochemical gradient is larger Na+ than for K+
Reason:
The transfusion of Na+ or K+ takes place through either ion leakage or ion pumping. Generally the state of cell is steady which is represented by the resting membrane potential. To start any movement across the membrane, the membrane potential need to be modulated from the resting position
The first movement starts with the opening of channel for Na+ in the membrane. Since the concentration of Na+ outside the cell is ten times the concentration of Na+ inside the cell, the Na+ ion move into the cell driven by concentration gradient. The concentration gradient of sodium is extremely strong and sodium continues to move into the cell even when the membrane potential becomes zero. As the sodium moves into the cell depolaristaion is caused due to which the negative resting potential of membrane changes from -70 mV to +30 mV. With positive membrane potential, the voltage-gated channels gets opened and both sodium and potassium starts moving across the membrane. K+ moves across the membrane primarily due to the effect of electrical gradient. K+ also move across the membrane through due to concentration gradient but since the concentration difference across the channel is not as high as sodium, it could not open the voltage gate. Thus, Na movement is primarily driven by concentration gradient (in smaller amount by electrical gradient too), K movement is primarily driven by electrical gradient (in smaller amount by concentration gradient too) but the combined effect of both the concentration and electrical gradient is higher for Sodium.
