ai. What are sense organs?
ii. Name three sense organs that respond to the stimulus of chemicals
b. List three animals each that exhibit the following courtship behaviours
i.territoriality ii. pairing
ci. State one similarity between the eggs of toad and the eggs of birds.
ii. State three differences between the eggs of toads and the eggs of birds.
d. Complete the table below by listing four organisms involved in the nitrogen cycle and state one role each of the organisms.
| four organisms involved in nitrogen circle | one role of organism |
e. Complete the table below by naming two types of heterotrophic modes of nutrition in animals and give two examples each of the organisms that carry out the modes of nutrition.
|
Two modes of heterotrophic nutrition |
Two examples of organisms that carry out mode of nutrition |
Explanation
ai. Organs with sensory receptors; that detect changes from the environment;and relay the impulses to the nervous system;for interpretation and appropriate response sent to the effector organ.
ii. -Tongue;
-Nose;
-Skin;
bi.
-Agama lizard/lizard;
-Leopard/tiger;
-Jaguar;
-Lion;
-Monkey;
-Chimpanzee/baboon;
-Dog;
-Cat;
-Male Tilapia.
ii.
-Termite;
-Human;
-Gibbon;
-Domestic fowl/duck/pigeon;
-Fish;
-Spider;- monkey,- toad;
ci. Both have
-yolk;
-embryo;
-vitelline membrane
cii.
| Eggs of toads | Eggs of birds |
|
Surrounded by jelly coat |
surrounded by calcareous shell; |
|
Relatively smaller |
Relatively larger |
|
Shell membrane absent |
Shell membrane absent |
|
Presence of black part |
No black part |
| Eggs are laid in chains | Eggs are laid in single piece |
|
Many/numerous eggs |
One egg at a time |
| Transparent | Opaque |
| Airspace absent | Airspace present |
| Yolk not suspended in chalaza | Yolk suspended in chalaza |
d.
|
Organisms involved in the nitrogen cycle |
One role of organism |
| Animal |
Excrete nitrogenous compounds,Eat proteins in plant,Die,decay to form ammonium compound; |
| Plant |
Absorbs nitrate from soil/Die/decay to form ammonium compound; |
| Putrefying bacteria | break down dead plants and animals |
| Azotobacter |
Converts atmospheric nitrogen to nitrate |
| Rhizobium | Converts atmospheric nitrogen to nitrates |
| Nitrobacter | Converts nitrites to nitrate. |
| Nitrosomonas | Converts ammonium compounds to nitrites. |
| Pseudomonas | converts amino compounds to ammonium compounds |
e.
| Two modes of heterotrophic nutrition | Two examples of organisms that can carry out mode of nutrition |
| Holozoic |
Human,domestic fowl,dog,cat,goat,sheep,cow,snake,lion,rabbit,amoeba |
| Parasitic | lice, tick,tapeworm,liverfluke,guinea worm,hookworm. |
| Saprophytic | fungi,mushroom,soil bacteria,yeast,rhizopus,mucor. |