IGCSE BIO end year exam

4 different descriptions about plants are given below. Which statement would apply to a plant that is dicotyledon.

• The veins in the leaf are reticulated

• Each flower has 6 petals

• the flowers are all wind-pollinated

• the leaf has parallel veins

Some of the processes carried out by living organisms are illustrated in the diagram below.

Which correctly describes the characteristics shown by living organisms in the diagram above?

• W - respiration, X - photosynthesis, Y - respiration

• W - respiration, X - respiration, Y - nutrition

• W - photosynthesis, X - respiration, Y - excretion

• W - respiration, X - excretion, Y - nutrition

A list of subcellular structures is given below

1. Nucleus

2. Ribosomes

3. Vacuole

4. Chloroplast

Which of the above structures would always be visible in a plant cell?

• 1,2 & 4

• 1, 3 & 4

• 1 & 3 only

• 1 & 4 only

The salivary glands contain cells which are responsible for producing salivary amylase, a digestive enzyme.

Which organelles would be present in large numbers in cells of the salivary glands?

• mitochondria and nuclei

• nuclei and ribosomes

• mitochondria and vacuoles

• mitochondria and ribosomes

Which row of the table below correctly describes a spongy mesophyll cell?

• A

• B

• C

• D

Which row of the table below correctly matches a structure to its level of organisation within an organism?

• A

• B

• C

• D

The image below show a palisade mesophyll cell found in the leaves of plants.

What is the structures X, Y and Z?

• X - mitochondrion, Y - vacuole, Z - nucleus

• X - chloroplast, Y - nucleus, Z - vacuole

• X - chloroplast, Y - vacuole, Z - nucleus

• X - mitochondrion, Y - nucleus, Z - vacuole

A plant absorbs a number of substances into its roots. Which of the table below correctly shows the substances absorbed by the roots and how these substances are absorbed?

• A

• B

• C

• D

A group of students carried out an investigation into osmosis using cylinders of potato. The results are:

- Concentration of salt solution: 0.2 mol dm^-3

- Mass of potato cylinder at start: 2.5 g

- Mass of potato cylinder after 24 hours: 2.7 g

Which statement below is correct?

• A

• B

• C

• D

Osmosis is

• The active movement of molecules from a region of their lower concentration to a region of their higher concentration.

• The movement of water through a partially permeable membrane from a more concentrated to a more dilute solution

• Particles from a region of lower concentration to a region of higher concentration using energy from respiration.

• The movement of water through a partially permeable membrane from a more dilute to a more concentrated solution