उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

What does xylem carry in a plant?

1. ASugars from the leaves to the roots
2. BOxygen from the leaves to the roots
3. CWater and minerals from the roots upward
4. DSeeds from the flowers to the soil

How many micrometres (µm) are in one millimetre?

1. A10
2. B100
3. C1 000 000
4. D1000

Which sex chromosomes does a typical human male have?

1. AXX
2. BYY
3. CXY
4. DX only

How does facilitated diffusion differ from active transport?

1. AIt works without any membrane proteins
2. BIt needs no energy and moves substances down their gradient
3. CIt needs ATP and moves substances against their gradient
4. DIt moves only water and no other substances

A bone marrow transplant can treat some blood cancers. Why does it work?

1. AThe donor red cells divide to make more red cells
2. BThe donor stem cells produce new, healthy blood cells
3. CThe donor marrow contains antibiotics that kill cancer
4. DThe transplant replaces the patient's bones

What is the role of oxygen in aerobic respiration?

1. AIt accepts electrons at the end of the transport chain
2. BIt breaks pyruvate into lactic acid
3. CIt is built into glucose molecules
4. DIt is split to release the energy needed for glycolysis

PCR starts with one double-stranded DNA molecule, and the number of copies doubles each cycle. How many copies are there after 10 cycles?

1. A20
2. B1024
3. C512
4. D100

A plant is kept in the dark to use up its starch. One leaf is then sealed in a bag with a chemical that absorbs CO₂, and the plant is placed in light. Later, that leaf has no starch, but the other leaves do. What does this show?

1. AOxygen is needed for photosynthesis
2. BCarbon dioxide is needed for photosynthesis
3. CLight is needed for photosynthesis
4. DChlorophyll is needed for photosynthesis