Question 1
Explain the term Binomial Nomenclature
Answer
Scientific double naming of organisms;
Question 2.
Name three forces involved in transportation of water and mineral salts
Answer
1. Transpiration pull;
2. Capillarity;
3. Root pressure;
2. Capillarity;
3. Root pressure;
Question 3
- Give two roles of DNA.
- State the difference between DNA and RNA
Answer
-
1. genetic information in coded form;
2. Transfer genetic information to daughter cells unchanged; -
Question 4
Two strips A and B were cut from Tradescantia whose cell sap was 30% sugar. Strip A was placed in a solution of 10% sugar concentration while strip B was placed in 50% sugar concentration
- What change was expected in strips A and B
- Account for the results in strip A
Answer
-
A – increased in size;
B – Reduced in size; - The strip cells have their cell saps being hypertonic in the sugar solution; takes in water by osmosis; their cells become turgid making the strips to be enlarged
Question 5
State the biological significance of each of the following
- Thick muscular walls and narrow lumen in arteries.
- Narrow xylem vessels in flowering plants
Answer
- Maintain high blood pressure
- Sustain capillarity