Biology Past Questions and Answers

The blood vessel which carries blood from the alimentary canal to the liver is the?

A Hepatic artery
B Hepatic vein
C Hepatic portal vein
D Mesenteric artery

Question 27:

When a Spirogyra cell is immersed in a salt solution more concentrated than its cell sap, it?

A Remains unchanged
B Takes tip water and burst
C Absorbs a little water
D Loses water and shrivels

Question 28:

The initial volume of water poured into a bag of dry soil was 50ml and the amount that drained through was 35mI. The percentage water content of the fully soaked soil is, therefore?

A 46.7
B 25.0
C 20.0
D 30.0

Question 29:

In demonstrating the importance of mineral elements in plants, the culture bottle must be darkened to?

A Prevent algal growth in culture solution
B Allow root growth
C Prevent breakdown of mineral elements
D Prevents photosynthesis in the root

Question 30:

One of the functions of the xylem is?

A Strengthening the stem
B Manufacturing food
C Reducing loss of water
D Conducting manufactured food