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Objectives

*Ghana only*

5A)  Floral formula is a number and symbol used to represent a part of flower

5e)

 Biochemical oxygen demand (BOD, also called biological oxygen demand) is the amount of dissolved oxygen needed (i.e., demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.

5eii) Biochemical Oxygen Demand is an important water quality parameter because it provides an index to assess the effect discharged wastewater will have on the receiving environment.

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QUESTION 1

a) i).  ¶ white blood cells

          ¶ lipids

    ii).  ¶ responsible for the removal of interstitial fluid from tissues

          ¶ It transports white blood cells to and from the lymph nodes into the bones

b) i).  ¶ oxygen

          ¶ excretory products, such as carbon dioxide, urea, etc

          ¶ Hormones

    ii)   Plants absorb water from the soil through their root hairs which are surrounded by soil water in

           the soil. The soil water is a more dilute solution than the soil sap inside the root hair hence

           water molecules move from soil water into the root hairs by the process of osmosis. Mineral

           salts are absorbed through the cell membrane often from a zone of their low concentration in 

           the soil to a zone of their higher concentration in the cells of the roots through active

           absorption.

      

c) i).  Placentation is the arrangement of ovules within an ovary. The part of the ovary where the 

          ovules are attached is called a placenta.

    ii). ¶ Marginal placentation

         ¶ Parietal placentation

         ¶ Axile  placentation

         ¶ Free central placentation

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*3a*

Occurring group of different organisms living together and interacting in the same environment.

               ii

Population=is defined as the total number of organisms of the same species living together in a given area

           iii

Ecologicalnide==Refers to the specific portion of a habit which is occupied by a particular organism 

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             3b

Because all living organism need energy and nutrient in an environment in other to sustrundipe

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              3c

1).  Lack of enough food 

2)  out break of disease

3) lack of money Cii

Exposed the soil into erosion

Cause loss of nutrient  into the plant 

Cause low yield

6a) *we are solving* ..

6bi)

Irritability is the ability to be excited to a characteristic action or function by the application of some stimulus

Or

Irritability is the Abnormal sensitivity or excessive responsiveness, as of an organ or body part, to a stimulus.

6ci) Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning. Examples of human-powered tilling methods using hand tools include shovelling, picking, mattock work, hoeing, and raking

 6ei) Oviparity is the expulsion of undeveloped eggs rather than live young. The eggs may have been fertilized before release, as in birds and some reptiles, or are to be fertilized externally, as in amphibians and many lower forms. In general, the number of eggs produced by oviparous species greatly exceeds the number of offspring from species that bear live young, but the chances of survival are diminished because of the lack of maternal protection. 

Or 

Oviparity is the producing eggs that mature and hatch after being expelled from the body, as birds, most reptiles and fishes, and the monotremes.

ii)  Viviparity is the retention and growth of the fertilized egg within the maternal body until the young animal, as a larva or newborn, is capable of independent existence. The growing embryo derives continuous nourishment from the mother, usually through a placenta or similar structure.

 6f)

Rhizobium turns the free Nitrogen in air into 

- Ammonia

- Nitrate