Question 1
Name the antigens present in red blood cells of a person whose blood group is B positive.
Answer
Antigen B
Antigen Rhesus
Antigen Rhesus
Question 2
Give reasons for the following structural modifications in axial skeleton of humans
- Fused sacral vertebrae
- Long transverse process in lumbar vertebrae.
Answer
- Fused sacral vertebrae - For strength / to transmit weight of stationery animal to the rest of body.
- Long transverse process in lumbar vertebrae -for attachment of muscles (to maintain posture and flex spine).
Question 3
What is adaptive radiation?
Answer
Adaptive radiation - Situation where organisms have homologous structures / structures with common embryonic origin but modified to perform different functions; to adapt organisms to different functions; to adapt organisms to different habitats / niches.
Question 4
State two ways in which homosapiens differs from homohabilis.
Answer
- Standing upright / erect posture
- High intellectual capacity / thinking capacity
- Communicate through speech / language.
- High intellectual capacity / thinking capacity
- Communicate through speech / language.
Question 5
State three characteristics of class Reptilia.
Answer
- Body covered with dry scaly skin.
- Majority have four limbs with snakes having no limb.
- Eggs have leathery shell (to reduce desiccation)