Question 1
a) What is metamorphosis?
b) What is the biological significance of metamorphosis to an insect?
Answer
a) Metamorphosis - Sudden change in body form of an organism in the course of its life cycle from egg to adult forms.
b) - Enable an organism to grow in size and complexity
- Enable organism to occupy different habitats/ecological niches.
b) - Enable an organism to grow in size and complexity
- Enable organism to occupy different habitats/ecological niches.
Question 2
The diagram below shows a certain plant
- Name the division in the kingdom Plantae to which the plant belongs.
- State the functions of structure labelled K and L
K
L
Answer
- Pteridophyta
-
K - for anchorage
L - produce spores
Question 3
State three functions of an exoskeleton in members of the phylum Arthropoda.
Answer
- Support inner delicate tissues.
- Protects inner delicate tissue from mechanical injury/excessive water loss.
- Provide surface for muscle attachment.
Question 4
The diagrams below show embryos of certain vertebrates animals. Study them and answer the question that follows
- Mention two observable structural features in these embryos that suggest that they have a common ancestral origin.
- What phenomenon in organic evolution is exhibited by these diagrams of embryos?
Answer
- Have a tail
- Notochord
Question 5
What is meant by the terms?
- Hypogenous flower
- Gamesepalous
- Dichagamy
Answer
- Hypogenous flower - A flower with superior ovary with other floral parts below the ovary.
- Gamesepalous - Fused sepals.
- Dichagamy - A condition in flowers where either the male or female parts mature before the other.