उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

What is an ecosystem?

1. AA single organism together with all of its organs and tissues
2. BThe weather in a particular region
3. CAll the members of one species in an area
4. DThe living things in an area and their non-living surroundings

What is an inference?

1. AA list of the materials used in an experiment
2. BA conclusion reached from observations and prior knowledge
3. CA measurement taken with a calibrated instrument in a laboratory
4. DA variable that the scientist changes on purpose

A solution has a pH of 3. How is it described?

1. AAcidic
2. BNeutral
3. CIsotonic
4. DBasic

Salivary amylase begins the digestion of which nutrient in the mouth?

1. AProtein
2. BStarch
3. CFat
4. DCellulose

A person catches chickenpox once and does not usually become ill with it again. Why?

1. AMemory cells give a faster, stronger response the next time
2. BThe virus stays in the blood and kills new viruses
3. CThe skin becomes thicker after the first infection
4. DAntibodies from the first infection turn into new viruses

Which is an example of negative feedback?

1. AContractions growing stronger during labour
2. BSweating when body temperature rises
3. CBlood clotting speeding up once it starts
4. DA wound becoming more inflamed over time

Potato cylinders are placed in sugar solutions of different strengths. They gain mass in weak solutions, lose mass in strong ones and show no change at 0.3 mol/L. What can be concluded?

1. AThe potato cells have a solute concentration of about 0.3 mol/L
2. BThe potato cells contain no water at all
3. CSugar enters the cells only by active transport, not by diffusion
4. DPotato cells are always hypertonic to sugar solutions

Why are there usually far fewer top predators than herbivores in an ecosystem?

1. ATop predators reproduce faster than herbivores, so they die sooner
2. BEnergy is lost at each step, leaving little for the top level
3. CTop predators need less energy than herbivores
4. DHerbivores eat the young of top predators