Answer:
when a concentration gradient exists and more of the substance is on the inside of the cell
Explanation:
Active transport moves substances against the concentration gradient, from an area of low concentration to an area of high concentration. It requires the use of energy, usually in the form of ATP.
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Answer 1:
The correct option is A. 6CO2 + 6H2O → C6H12O6 + 6O2
Explanation
The letter W depicts the mechanism of photosynthesis taking place. As a result of photosynthesis, glucose and oxygen will be made. The Oxygen will then be released and taken up by the animal during the process of respiration.
Answer 2:
The correct option is D.
Explanation
The animals that show competition are sparrows and toad. As we can see from the diagram of the food web, sparrow and toad are main competitors in the food chain. Competition is a mechanism in food web in which two organisms compete for resources in a habitat. They usually have the same enemies and same food sources to feed on. As in the diagram, sparrow and toad have the same enemy i.e hawk and same food source i.e grasshopper.
Answer 3:
The correct option is C. An increase in the producers and a decrease in the secondary consumers
Explanation:
Grasshoppers are the primary consumers in the given food web. A decrease in the population of grasshoppers will lead to an increase in the population of the producers. This is because there will be less consumers to feed on the plants. Sparrow and toad are the secondary consumers according to the diagram. As they feed on the grasshoppers, a decline in the population of grasshoppers will also lead to a decline in the population of sparrow and toad. As they will have limited amount of food and will have to under go severe competition for food.
Answer 4:
The correct option is D. Its optimum temperature is 40 degrees Celsius.
Explanation:
Optimum temperature can be described as the temperature at which the activity of the enzyme is fastest. Different enzymes have different optimum temperatures. The graph in the figure shows that the activity of purified phosphatase enzyme was maximum at 40 degrees Celsius. Hence, this temperature is the optimum temperature for this enzyme.
Water! It is the source of all life.
