Quiz 14 of 14

2014 Biology WAEC Theory Past Questions

Responses

Your email address will not be published. Required fields are marked *

back-to-top
error:

1(a)(i) List three characteristics of living organisms.

 Answer:  Movement/Locomotion, Excretion, Respiration, Reproduction, Irritability/Sensitivity/Response, Growth/Development, Nutrition/Feeding.

(ii) Explain briefly the characteristics listed in (a)(i) above.

Answer:

- Movement/Locomotion: Living things change position of the whole body/parts of the body from one place to another in search of food/shelter/mates etc.

- Excretion: This involves the removal/getting rid of waste products of cell metabolism, metabolic waste are poisonous if allowed to accumulate.

- Respiration: This is the breakdown of food substances by aerobic or anaerobic respiration to release energy need for all processes of life.

- Reproduction: This is the ability of living organisms to produce new individual of their own kind, this ensures the continuity of the species of organism.

- Irritability/Sensitivity/Response: Response or reaction of organism towards change in the environment, to ensure survival.

- Growth/Development: This is the irreversible increase in size and weight of an organism which leads to complexity and maturation.

- Nutrition/Feeding: The process involve in obtaining or manufacturing of food. It can be autotrophic or heterotrophic and utilizing it for growth and maintenance/life process.

(b) In a tabular form, state four differences between plants and animals.

(c)(i) Name one organism that exhibits both plant and animal features.

Answer:

Euglena/ Chlamydomonas     

(ii) State four animal features and two plant features possessed by the organism named in (c)(i) above.

Animal features for Euglena

- Gullet for feeding

- Presence of flagellum for locomotion in water

- Myones for movement

- Presence of pellicle that gives it a definite shape

- It has contractile vacuole for osmoregulation and excretion

Animal features for Chlamydomonas

 - Presence of flagellum for locomotion

- Eye spot for sight

- Contractile vacuole for osmoregulation and excretion

Plant features for Euglena and Chlamydomonas

- Presence of chloroplast containing chlorophyll for absorption of light

- Definite shape

- Paramylon granules for storage of starch

- Presence of pyrenoid for production of paramylon granules

 

2(a) Define the following
(i) elimination
(ii) excretion
(iii) secretion

- Elimination: this is the removal of undigested food; from the body of a living organism.

- Excretion : This is the removal of waste product of metabolism from the cells/tissues of an organism; wastes may be toxic if they are retained in the body.

- Secretion : this is the production and release of substances; useful to the body; by specialized glands of living organisms.

(b) Describe the digestion of boiled fish in the gut of humans

Boiled fish is a source of protein; which can be chewed and swallowed into the stomach. Digestion of proteins starts from the stomach; the stomach secretes gastric juice, containing pepsin, rennin and hydrochloric acid; pepsin in acidic medium acts on the boiled fish and converts it to peptide; peptides move into the duodenum where pancreatic juice is secreted; undigested protein is acted upon by trypsin in alkaline medium; peptides/peptones are formed; erepsin finally act on peptides/peptones in alkaline medium; this is finally converted to amino acids which is the end product of protein digestion.

(c) Make a diagram 8cm - 10cm long of a longitudinal section of a villus and label fully.

3(a) Explain briefly the following ecological terms:
(i) biosphere
(ii) habitat

- Biosphere:  This is the total or whole area of the earth that can be inhabited by living things; it is a place where life exist.

- Habitat: This is a place within an environment where an organism naturally lives; it is a natural dwelling place of an organism.

(b) Describe the mode of nutrition in a named carnivorous plant.

Examples of carnivorous plant  : Butterwort (Pinquicula), Sundew (Drosera), Venus flytrap (Dionaea)

Mode of nutrition of Butterwort/Sundew/Venus fly trap

(c) State three reasons why the dispersal of fruits and seeds are important.

Importance of fruit and seed dispersal

- Prevents overcrowding of plants

- Prevents diseases from spreading among plant species

- Results in colonization of new areas with new plants

- Prevents undesirable competition for space/light/water and nutrients

(d) State six methods of conserving soil.

4(a)(i) Explain the term co-dominance

- Co-dominance occurs when both alleles in an heterozygous individuals are fully expressed; both alleles exert their effects so that the hybrid has a phenotype that is different from that of its parents.

A survey to determine blood groups was carried out on 250 people living in a community. The results are represented in the table below.

(ii) Calculate the number of individuals with co-dominance blood group

Calculation:    32.8% of 250

                  = 32.8 x 250

100

= 82 individuals /people

(iii) What is the total number of individuals in the table that are able to donate blood to an accident victim with blood group B?

- Total number of individuals that can donate blood to blood group B

Total number of individuals is from groups B and O

14% of the population is blood group B

14% of 250 = 14/100 x250 =    35 individuals/people

42.5% of the population is blood group O

45.2% of 250 = 45.2/100 x 250  = 113 individuals/ people.

Total number of people = 113 individuals of group O + 35 individuals of group B

= 148 individuals/ peoples

Therefore, 148 individuals or peoples can donate to the accident victim with blood group B

(b)   A man whose blood group is heterozygote A is married to a woman whose blood group is AB. With the aid of a genetic diagram, suggest the possible blood group of their children.

 

 

5(a) State five reasons why animals move from place to place

Reasons why animals move from place to place

- To search for food

- Escape from predators

- To avoid danger

- Locate new and favourable habitat

- To find mates for reproduction

(b) State one function each of the following structures found in plants;

(i) epidermis  (ii) phloem   (iii)  Sclerenchyma

Function of structures found in plants

(c) Give two examples each of the following types of organisms:

(i) parasitic plants    (ii) saprophytes

Examples of organisms

Parasitic plants

 Saprophytes

(d) State two adaptive features of plants which inhabit salt water swamp.

Adaptive features of plants in salt water swamp

- Presence of succulent root /stem store water tom dilute the salt

- Presence of stilt root; for anchorage

- Some secret excess salt into swamps; to maintain balance of body salt.

(e) State two factors each which result in

(i) increase (ii) decrease in population density

Factors that cause

Increase in population density

Decrease in population density

- Emigration

- Diseases

- High mortality rate

(f) Mention four ways in which modern agricultural activities may threaten the survival of species.

Ways in which modern agricultural activities may threaten the survival of species

(g) State three reasons why mitosis is important to living organisms

(h) State three causes of food spoilage

Causes of food spoilage

- Inadequate storage facility

- Improper storage which results in deterioration and spoilage of stored foods

- Delay in transportation due to bad roads

- Use of contaminated water to wash fruits

1(a)(i) List three characteristics of living organisms.

 Answer:  Movement/Locomotion, Excretion, Respiration, Reproduction, Irritability/Sensitivity/Response, Growth/Development, Nutrition/Feeding.

(ii) Explain briefly the characteristics listed in (a)(i) above.

Answer:

- Movement/Locomotion: Living things change position of the whole body/parts of the body from one place to another in search of food/shelter/mates etc.

- Excretion: This involves the removal/getting rid of waste products of cell metabolism, metabolic waste are poisonous if allowed to accumulate.

- Respiration: This is the breakdown of food substances by aerobic or anaerobic respiration to release energy need for all processes of life.

- Reproduction: This is the ability of living organisms to produce new individual of their own kind, this ensures the continuity of the species of organism.

- Irritability/Sensitivity/Response: Response or reaction of organism towards change in the environment, to ensure survival.

- Growth/Development: This is the irreversible increase in size and weight of an organism which leads to complexity and maturation.

- Nutrition/Feeding: The process involve in obtaining or manufacturing of food. It can be autotrophic or heterotrophic and utilizing it for growth and maintenance/life process.

(b) In a tabular form, state four differences between plants and animals.

(c)(i) Name one organism that exhibits both plant and animal features.

Answer:

Euglena/ Chlamydomonas     

(ii) State four animal features and two plant features possessed by the organism named in (c)(i) above.

Animal features for Euglena

- Gullet for feeding

- Presence of flagellum for locomotion in water

- Myones for movement

- Presence of pellicle that gives it a definite shape

- It has contractile vacuole for osmoregulation and excretion

Animal features for Chlamydomonas

 - Presence of flagellum for locomotion

- Eye spot for sight

- Contractile vacuole for osmoregulation and excretion

Plant features for Euglena and Chlamydomonas

- Presence of chloroplast containing chlorophyll for absorption of light

- Definite shape

- Paramylon granules for storage of starch

- Presence of pyrenoid for production of paramylon granules

 

2(a) Define the following
(i) elimination
(ii) excretion
(iii) secretion

- Elimination: this is the removal of undigested food; from the body of a living organism.

- Excretion : This is the removal of waste product of metabolism from the cells/tissues of an organism; wastes may be toxic if they are retained in the body.

- Secretion : this is the production and release of substances; useful to the body; by specialized glands of living organisms.

(b) Describe the digestion of boiled fish in the gut of humans

Boiled fish is a source of protein; which can be chewed and swallowed into the stomach. Digestion of proteins starts from the stomach; the stomach secretes gastric juice, containing pepsin, rennin and hydrochloric acid; pepsin in acidic medium acts on the boiled fish and converts it to peptide; peptides move into the duodenum where pancreatic juice is secreted; undigested protein is acted upon by trypsin in alkaline medium; peptides/peptones are formed; erepsin finally act on peptides/peptones in alkaline medium; this is finally converted to amino acids which is the end product of protein digestion.

(c) Make a diagram 8cm - 10cm long of a longitudinal section of a villus and label fully.

3(a) Explain briefly the following ecological terms:
(i) biosphere
(ii) habitat

- Biosphere:  This is the total or whole area of the earth that can be inhabited by living things; it is a place where life exist.

- Habitat: This is a place within an environment where an organism naturally lives; it is a natural dwelling place of an organism.

(b) Describe the mode of nutrition in a named carnivorous plant.

Examples of carnivorous plant  : Butterwort (Pinquicula), Sundew (Drosera), Venus flytrap (Dionaea)

Mode of nutrition of Butterwort/Sundew/Venus fly trap

(c) State three reasons why the dispersal of fruits and seeds are important.

Importance of fruit and seed dispersal

- Prevents overcrowding of plants

- Prevents diseases from spreading among plant species

- Results in colonization of new areas with new plants

- Prevents undesirable competition for space/light/water and nutrients

(d) State six methods of conserving soil.

4(a)(i) Explain the term co-dominance

- Co-dominance occurs when both alleles in an heterozygous individuals are fully expressed; both alleles exert their effects so that the hybrid has a phenotype that is different from that of its parents.

A survey to determine blood groups was carried out on 250 people living in a community. The results are represented in the table below.

(ii) Calculate the number of individuals with co-dominance blood group

Calculation:    32.8% of 250

                  = 32.8 x 250

100

= 82 individuals /people

(iii) What is the total number of individuals in the table that are able to donate blood to an accident victim with blood group B?

- Total number of individuals that can donate blood to blood group B

Total number of individuals is from groups B and O

14% of the population is blood group B

14% of 250 = 14/100 x250 =    35 individuals/people

42.5% of the population is blood group O

45.2% of 250 = 45.2/100 x 250  = 113 individuals/ people.

Total number of people = 113 individuals of group O + 35 individuals of group B

= 148 individuals/ peoples

Therefore, 148 individuals or peoples can donate to the accident victim with blood group B

(b)   A man whose blood group is heterozygote A is married to a woman whose blood group is AB. With the aid of a genetic diagram, suggest the possible blood group of their children.

 

 

5(a) State five reasons why animals move from place to place

Reasons why animals move from place to place

- To search for food

- Escape from predators

- To avoid danger

- Locate new and favourable habitat

- To find mates for reproduction

(b) State one function each of the following structures found in plants;

(i) epidermis  (ii) phloem   (iii)  Sclerenchyma

Function of structures found in plants

(c) Give two examples each of the following types of organisms:

(i) parasitic plants    (ii) saprophytes

Examples of organisms

Parasitic plants

 Saprophytes

(d) State two adaptive features of plants which inhabit salt water swamp.

Adaptive features of plants in salt water swamp

- Presence of succulent root /stem store water tom dilute the salt

- Presence of stilt root; for anchorage

- Some secret excess salt into swamps; to maintain balance of body salt.

(e) State two factors each which result in

(i) increase (ii) decrease in population density

Factors that cause

Increase in population density

Decrease in population density

- Emigration

- Diseases

- High mortality rate

(f) Mention four ways in which modern agricultural activities may threaten the survival of species.

Ways in which modern agricultural activities may threaten the survival of species

(g) State three reasons why mitosis is important to living organisms

(h) State three causes of food spoilage

Causes of food spoilage

- Inadequate storage facility

- Improper storage which results in deterioration and spoilage of stored foods

- Delay in transportation due to bad roads

- Use of contaminated water to wash fruits