2023 WAEC Gce Jan/Feb Biology (Obj & Essay) Question & answer – 1st Series

(1a)

Advantages of Cross Pollination

(1) Cross pollination leads to the production of healthier offspring than self pollination.

(i) It also produces viable seeds.

(iii) Offspring or individuals produced are more adapted to the environmental conditions.

(iv) It also leads to the formation of new varieties with good characteristics.

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1b
i.stigma and style
ii.anther and filament.

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1c.
1. Monocarpous pistill
2. Apocarpous pistill
3. Syncarpous pistill

2ai:“Nutrition is the process of taking in food and converting it into energy and other vital nutrients required for life.”

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2bi:amebae
flagellates
ciliates
parasitic sporozoans.
pick any three

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2bii:
Tabulate..
Under amoeba: 1:Amoeba engulfs its food by surrounding the food particle with its pseudopodia. The undigested food is expelled out by the vacuole
2: in amoeba food is digested in a food vacuole.
Under humans:
1:While in human beings, the food (which is complex substance) is taken inside the mouth and undergoes a complex process of digestion and absorption in the digestive system.
2:human beings have complex digestive system where food gets digested in separate regions

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4ai
Blood group in humans are inheritable traits and inherited from parents to offspring on the basis of Mendel’s law. That group inheritance depends upon the genes received from parents. Genes controlling blood group in man are 3 instead of two and are known as multiple alleles. All these three genes or the allele are located on the same locus on chromosomes. A person can have only two of these three genes at a time which may be either similar or dissimilar in nature. These genes control the production of blood group antigen in the offspring. In human blood grouping system, there are three alleles A, B, O. The 3 alleles of human blood group are said to be codominant because both are expressed in the phenotype A and B.

4aii

choose only two antigen

A Rh+, A Rh-, B Rh+, B Rh-, AB RH+, AB Rh-, 0 Rh+, or 0 Rh- .

4c.
There are many forms of evidence for evolution. One of the strongest forms of evidence is comparative anatomy; comparing structural similarities of organisms to determine their evolutionary relationships. Organisms with similar anatomical features are assumed to be relatively closely related evolutionarily, and they are assumed to share a common ancestor. As a result of the study of evolutionary relationships, anatomical similarities and differences are important factors in determining and establishing classification of organisms.

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(5ai)
1.Nose, mouth, or eyes to hands to others:
Germs can spread to the hands by sneezing, coughing, or rubbing the eyes and then can be transferred to other family members or friends. Simply washing your hands can help prevent such illnesses as the common cold or eye infections.

2.Hands to food:
Usually germs are transmitted from unclean hands to food by an infected food preparer who didn’t wash his or her hands after using the toilet. The germs are then passed to those who eat the food. This is easily prevented by always washing your hands after using the toilet and before preparing food items.

3.Food to hands to food:
Germs are transmitted from raw foods, such as chicken, to hands while preparing a meal. The germs on the hands are then transferred to other uncooked foods, such as salad. Cooking the raw food kills the initial germs, but the salad remains contaminated.

4.Infected child to hands to other children:
Germs are passed from a child with diarrhea to the hands of the parent during diaper changing. If the parent doesn’t immediately wash his or her hands, the germs that cause diarrhea are then passed to others.

5.Animals to people:
Wash your hands after petting animals or touching any surfaces they come into contact with.

ANOTHER VERSION OF ANSWER BELOW

(1a)
(i) The offspring are healthier
(ii) The seeds are produced in larger number and are more viable
(iii) The seeds develop and germinate properly
(iv) Results in new varieties.

(1bi)
(i) Stigma
(ii) Style

(1bii)
(i) Anther
(ii) Filament

(1c)
(i) Unicarpellate
(ii) Syncarpous
(iii) Apocarpous

(1d)
Draw the diagram
[img]https://i.ibb.co/0MWthCS/images-12.jpg[/img]

(2ai)
Nutrition is the biochemical and physiological process by which an organism uses food to support its life.

(2bii)
[TABULATE]

(i)
=ORGANISM=
Fern

=MODE OF NUTRITION=
Autotrophic

(ii)
=ORGANISM=
Plasmodium

=MODE OF NUTRITION=
Parasitic

(iii)
=ORGANISM=
Tapeworm

=MODE OF NUTRITION=
Parasitic

(iv)
=ORGANISM=
Toad

=MODE OF NUTRITION=
Heterotrophic

(v)
=ORGANISM=
Rhizopus

=MODE OF NUTRITION=
Saprophytic

(vi)
=ORGANISM=
Chlamydomonas

=MODE OF NUTRITION=
Autotrophic

(2bi)
(i) Amoeba
(ii) Paramecium
(iii) Euglena

(2bii)
[TABULATE]

=AMOEBA=
(i) They are unicellular organisms
(ii) Simple digestive process.

=HUMANS=
(i) They are multicellular organisms
(ii) Complex digestive process.

(2biii)
(i) Both Amoeba and human beings are living organisms.
(ii) Both are made of similar living components and macromolecules.
(iii) Both are heterotropic or have a holozoic mode of nutrition.
(iv) Both derive their nutritions from other organisms.

(2c)
(i) Basidiomycetes
(ii) Zygomycota
(iii) Chytrids

 

(5ai)
1.Nose, mouth, or eyes to hands to others:
Germs can spread to the hands by sneezing, coughing, or rubbing the eyes and then can be transferred to other family members or friends. Simply washing your hands can help prevent such illnesses as the common cold or eye infections.

2.Hands to food:
Usually germs are transmitted from unclean hands to food by an infected food preparer who didn’t wash his or her hands after using the toilet. The germs are then passed to those who eat the food. This is easily prevented by always washing your hands after using the toilet and before preparing food items.

3.Food to hands to food:
Germs are transmitted from raw foods, such as chicken, to hands while preparing a meal. The germs on the hands are then transferred to other uncooked foods, such as salad. Cooking the raw food kills the initial germs, but the salad remains contaminated.

4.Infected child to hands to other children:
Germs are passed from a child with diarrhea to the hands of the parent during diaper changing. If the parent doesn’t immediately wash his or her hands, the germs that cause diarrhea are then passed to others.

5.Animals to people:
Wash your hands after petting animals or touching any surfaces they come into contact with.

 

 

 

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