a. Features of the small intestine that increase the rate of absorption of digested food
- Ridges/furrows on inner linings;
- Small finger-like projections/villi;
- Minute projections/microvilli on the villi;
- Thin epithelial lining of the villi;
- Highly vascularised/well supplied with blood;
- Intestine is long/it has a large surface area.
b. Fate of glucose formed in a plant during photosynthesis
- Glucose combines with Nitrogen/Sulphur/Phosphorus to form proteins for growth;
- Glucose is stored as starch;
- Glucose is oxidised to form carbon dioxide/water/energy in respiration;
- Glucose is also converted into lipids/cellulose which is stored.

c. Mode of feeding of
(i) Euglena
- Exhibits both autotrophic and heterotrophic modes of nutrition;
- In autotrophic mode of feeding, the chlorophyll in its stellate chloroplast absorbs sunlight energy;
- And the dissolved carbon dioxide in the pond water diffuses into the cell of Euglena;
- Inside the chloroplast, the absorbed solar energy/sunlight is used in the synthesis of glucose from water and carbon dioxide;
- Glucose is converted into starch and stored in the paramylum granules;
- In heterotrophic mode of feeding, it takes in organic matter/diatoms e.t.c.;
- Through the gullet;
- And digests it in the reservoir.

(i)Spirogyra
- Manufactures its own food through photosynthesis;
- Its spiral chloroplast/chlorophyll absorbs the sunlight energy;
- It absorbs carbon dioxide from water/its environment to manufacture food;
- The manufactured food is used;
- while the rest/excess is stored in its pyrenoid in the form of starch;
d. Characteristics of an Estuarine Habitat
- It is shallow;
- It has a high level of nutrients;
- Salinity/pH/O2 level fluctuates;
- Turbidity is high during rainy season;
- It is affected by tides;
- Species diversity is low;
- Muddy/soft soil/substratum
d. Differences between an aquatic and terrestrial habitat

Aquatic habitat	Terrestrial habitat
Temperature is lower	temperature is higher
Water is the medium for growth/reproduction	soil is a medium for growth
Presence of dissolved oxygen	presence of atmospheric oxygen
Organisms are not affected by humidity	organisms are affected by humidity
Organisms are affected by tide/waves/water/current	organisms are not affected by tide/waves/water current
Organisms are not affected by wind action	organisms are affected by wind action
Light affects the distribution of organisms more	light affects the distribution of organisms less
Water is abundant	water is not abundant