*BIOLOGY THEORY PRIVATE WASSCE*
*YOU TO ANSWER THREE (3) QUESTIONS IN ALL*
*TWO(2) QUESTIONS SECTION FROM A*
*SECTION B IS FOR GHANA ONLY*
*SECTION C IS FOR SIERRA LEONE,GAMBIA,NIGERIA AND LIBERIA*
*PLEASE READ CAREFULLY BEFORE YOU ANSWER ANY QUESTIONS*
Q1 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
*Q3a*
3a)
i)community is an interacting group of various species in a common location. For example, a forest of trees and undergrowth plants, inhabited by animals and rooted in soil containing bacteria and fungi, constitutes
ii)populationis all the organismsof the same group or species, which live in a particular geographical area, and have the capability of interbreeding.
iii)ecological niche describes how an organism or population responds to the distribution of resourcesand competitors (for example, by growing when resources are abundant
3b)
i)All living organism need energy and nutrient in an environment in other to sustainlife
ii)All living organisms need energy to maintain homeostasis
3ci)
i)Lack of enough food
ii)out break of disease
iii)lack of money
3cii)
i)Exposed the soil into erosion
ii)Cause loss of nutrient into the plant
iii)Cause low yield
3d)
To protect against soil erosion; improve the soil by adding organic matter, nutrients, and stability; and scavenge leftover nutrients. In other words Cover crops are used as ground cover, mulches, green manure, nurse crops, smother crops, and forage and food for animals or human
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
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