Edexcel B AS Biology 4

Welcome to your Edexcel B AS Biology 4

Which of the following factors affect the affinity of respiratory pigments?
a) pH of blood
b) Temperature
c) Concentration of ions in the blood
d) Altitude

Choose the correct sequence of structures in which the air passes through upon entering the nose.

Pure micelles consist of only ________.

Which among the following animals uses book lungs for respiration?

Which of the following adaptations reduce water loss by increasing the humidity?
a) Thick waxy cuticles
b) Stomata in pits
c) Leaves reduced to spines
d) Rolled leaves

Which of the following is not essential for the external respiration of vertebrates?

Which of the following is not a respiratory pigment?

Select the incorrect statement regarding mesophyll.

Which is not a component found in saliva?

Select the incorrect statement regarding gills.

A structure present in a villus.

A complex lipid absorbed by the small intestine with the help of micelles.

Which is not a component found in saliva?

The principle used by the fish to maintain a diffusion gradient during gas exchange.

What is the function of lacteal ducts?

The role of micelles in the digestive system.

Which of the following are lipid soluble vitamins?
a) Vitamin E
b) Vitamin B
c) Vitamin C
d) Vitamin D

A difference between arteries and arterioles.

Which is not an adaptation of xerophytic plants to reduce water loss?

Which is the largest artery in the body?