Question 1
Name the branch of Biology that deals with the study of
- Microscopic organisms
- Fungi
Answer
- Microscopic organisms - Microbiology
- Fungi - Mycology
Question 2.
The structure below is found in the members of a class in the kingdom Animalia
- Name the kingdom into which the prokaryotes are placed.
- State two characteristics used to classify arthropods in classes
- A certain plant had the following characteristics:
- • Presence of roots, stem and leaves.
• Found with sori on the under surface.
• Life cycle in sporophyte and gametophyte generations.
• Sporophyte generation being dominant.
- • Presence of roots, stem and leaves.
Answer
- Monera
- - Number of body parts
- Number of limbs
- Presence or absence of antennae - Pteridophyta
Question 3
- Name two structures for gaseous exchange in aquatic plants.
- Explain why guards cells have thicker inner walls and thinner outer walls.
Answer
- - Stomata
- Aerenchya
- Pneumatophores
- Epidermis
- Cuticle - Guard cells regulate the opening and closing of stomata, when they are turgid they bulge out and the thicker inner walls have a gap between them therefore opening the stomata.
Question 4
- Distinguish between homozygote and heterozygote.
- State two causes of variations
Answer
- Homozygote is an organism containing a pair of identical alleles for a particular trait while hererozygote is an organism having a pair of dissimilar alleles for a particular trait.
- - Meiosis or gamete formation / independent assortment of genes
- Fertilization
- Mutation
- Environmental conditions
Question 5
State the functions of the following cell organelles
(i) Nucleolus
(ii) Centriole
Answer
(i) Site for formation of Ribosomes
(ii) - Takes part during cell division; farming spindle app.
- Helps in formation of cilia and flagella
(ii) - Takes part during cell division; farming spindle app.
- Helps in formation of cilia and flagella
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