Biology Paper 2. Mistake Log

Just dont make these mistakes again.

Which substance is needed to make chlorophyll and which part of the plant absorbs the substance?

Magnesium is needed to make chlorophyll, and it is absorbed in the root hairs.

The diagram shows some apparatus that was used to produce lactose free milk.

The alginate beads do not react with any of the substances. X is an enzyme that catylses a reaction involving one of the substances found in milk.

What is X and Y?

X is lactase and Y is glucose

 Why do different cells in a human body produce different proteins? 

Only particular genes are expressed.

Which group of organs belongs to the same organ system? 

oesophagus, intestine, stomach

Which statements about hormones are correct?

2 and 4

Which structures are found in plant cells and bacterial cells?

Cell Membrane, Cell Wall, Ribosomes

Which row describes self-pollination?

B

Which conditions cause the highest rate of transpiration?

 high temperature, high wind speed and low humidity

In the dark, plant shoots grow upwards and roots grow downwards. 

Gravitropism only

What is the reason why antibiotics should be used only when essential? 

It reduces the natural selection of antibiotic resistant bacteria. 

The diagrams show four organisms. 

Which organism is a prokaryote? 

A

Which row describes continuous and discontinuous variation?

B

The diagram shows the inheritance, in one family, of a sex-linked recessive disease.

Which individuals in the diagram are heterozygous for this disease? 

2 and 3

The diagram shows the flow of energy, in units of energy, through a food chain. 
Which percentage of energy is lost between the producers and secondary consumers? 

99%

Which process in the nitrogen cycle can be caused by lightning and bacteria? 

Nitrogen Fixation 

 The diagram shows the cells of a mammalian embryo shortly after fertilisation.

What is the correct description of these cells? 

stem cells undergoing mitosis 

C

The diagram shows a cross-section of an eye.

Which row is correct when a person views a near object?

B

The photomicrograph shows some blood cells.

What is the name and function of the cell labelled X?

Phagocyte which engulfs pathogens.

Which sequence of statements explains the build-up and removal of oxygen debt?

A

Which row shows the effects of cholera on the human body?

C

Which structures in humans and in plants normally carry amino acids? 

Arteries and phloem

The diagram show cross-sections of a leaf, a root and a stem.

Which numbers represent the xylem in the leaf, the root and the stem?

leaf = 1, root = 4 ,stem = 6

Which statements describe an adaptive feature in an organism? 

1 and 3 only

A coral reef contains species such as stony corals, sponges, seahorses and whale sharks. 

These species interact with each other and are affected by the temperature, salt concentration and oxygen concentration of the water. 

Using all the information given, what is being described? 

Ecosystem

Which statement describes enzymes?

Enzymes are involved in metabolic reactions.

B

C

C

D

B

C

C

B

A

D

C

B

D

B

D

C

C

C

D

D

A

D

B

C

C

D

D

B

D