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Waec Gce 2017 Biology Obj And Theory Answer – Nov/Dec Expo

WAEC GCE Biology Obj And Essay/Theory Questions and Answer – NOV/DEC 2017 Expo Runz.


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BIOLOGY OBJ:
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6a)
i)it has gills for gaseous exchange
ii)it has a long tail that facilitates its movement
iii)its sucker secretes sticky cement which aids attachment to water weeds
iv)it has mouth with horny jaw for feeding

6bi)
Irritability is the Abnormal sensitivity or excessive responsiveness, as of an organ or body part, to a stimulus.
6bii)
i)light
ii)water

6ci)
Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning.
6cii)
i)it cause soil erosion
ii)it destroys soil living organisms
iii)it reduces soil fertility
iv)it leads to degredation

6d)
the female curves her back and lift her taik in the front of the male when the male is attracted he chases and mounts the female and he pushes the base of his tail beneath that of the female and their cloacal vents come into contact
6ei)
Oviparity is the producing eggs that mature and hatch after being expelled from the body, as birds, most reptiles and fishes, and the monotremes.
6eii)
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.
6f)
i)ammonia
ii)nitrate


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 resources and 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)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


1a)
i)white blood cells
ii)lipids
1aii)
i)responsible for the removal of interstitial fluid from tissues
ii)It transports white blood cells to and from the lymph nodes into the bones

1b)
i)oxygen
ii)excretory products, such as carbon dioxide, urea, etc
iii)Hormones
1bii)
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.

1c)
i)Placentation is the arrangement of ovules within an ovary. The part of the ovary where the ovules are attached is called a PLACENTA.
1cii)
i)Marginal placentation
ii)Parietal placentation
iii)Axile placentation
iv)Free central placentation



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