-
Below is a diagram of organism of a particular kingdom.
(a) Identify the kingdom to which it belongs.
(b) Name the parts labelled:
A:
B:
(c) Other than absorption of food state one main role of structure labelled C.
Date posted:
August 13, 2019
-
In an experiment, some germinating seeds were placed in a large air tight flask and left for 3 days. What are the expected changes in composition of air inside the flask?
Date posted:
August 13, 2019
-
The diagram below shows part of the mammalian female reproductive system.
(a) Name the part labelled B.
(b) State the function of part labelled B.
(c) State adaptations of the part labeled A.
Date posted:
August 13, 2019
-
Give reasons why an electron microscope cannot be used to view live specimens.
Date posted:
August 13, 2019
-
The diagram below shows a gaseous exchange structure in the stems of angiosperms.
Name;
(a) Part labelled A.
(b) The apparatus labelled X.
(c) Substances represented by arrows B and C.
Date posted:
August 13, 2019
-
Explain why glucose and proteins are absent in the urine of a healthy person.
Date posted:
August 13, 2019
-
Name the branch of biology that:
(a) Deals with phylogenetic relationship between organisms.
(b) Deals with disputed parentage.
(c) Would be useful to a beekeeper.
Date posted:
August 13, 2019
-
In mice the allele for black fur is dominant to the allele for brown fur.
What percentage offspring would have brown fur from a cross between heterozygous black mice and brown mice. Show your working. Use letter B to represent the allele for black colour
Date posted:
August 5, 2019
-
Draw and label the structure of a gill.
Date posted:
August 5, 2019
-
Give four modes of expressing food relationship in an ecosystem.
Date posted:
August 5, 2019
-
In a certain plant species, which is normally green, a recessive gene for colour (n) causes the plant to be white when present in the homozygous stat. Such plants die young at an early age. In the heterozygous state the plants are pale green and grow to maturity.
(a).Suggest a reason for the early death of the plants with the homozygous recessive genes.
(b).If a normal green plant was crossed with the pale green plant, what will be the phenotypic ratio of F1 generation?
(c).Give an explanation for the occurrence of pale green colour in the heterozygous state.
Date posted:
August 5, 2019
-
Differentiate between the mode of fertilization in higher plants and in mammals.
Date posted:
August 5, 2019
-
The eggs of birds are relatively much larger than those of mammals. Explain
Date posted:
June 18, 2019
-
The calyx cells of a certain plant has 22 chromosomes. State the number of chromosomes
present in the plant’s
i) Endosperm
ii) Ovule cell
Date posted:
June 18, 2019
-
Explain why menstrual periods stop immediately after conception?
Date posted:
June 18, 2019
-
Name the hormone that causes leaf, flowers and fruit abscission
Date posted:
June 18, 2019
-
Name the part of an ovule that develops into each of the following parts of a seed after
fertilization
i) Testa
ii) Endosperm
Date posted:
June 18, 2019
-
Name the components of blood that do not enter the renal tubule in mammals
Date posted:
June 17, 2019
-
A woman gave birth to a child of blood group B+ (B positive). Name the two antigens that determined her child’s blood group.
Date posted:
June 17, 2019
-
Uptake of water by plants is not affected by metabolic poisons. Explain.
Date posted:
June 17, 2019
-
Why do plants not take in oxygen during the day although they need it for respiration?
Date posted:
June 17, 2019
-
Explain why deficiency of vitamin K leads to excessive bleeding even from small cuts
Date posted:
June 17, 2019
-
State the factor that maintain transpiration stream
Date posted:
June 17, 2019
-
How are sieve tube elements adapted to their function
Date posted:
June 17, 2019
-
Explain why a fresh wound on the skin bleeds more on a hot sunny day than on a cold chilly day.
Date posted:
June 17, 2019
-
Why is an effective respiratory system often associated with a circulatory system.
Date posted:
June 17, 2019
-
The equation below summarizes a metabolic process in plants.
Glucose----> Ethanol + carbon (IV) oxide+ Energy
State two industrial applications of the above equation.
Date posted:
June 17, 2019
-
Give two reasons why fats are not the main respiratory substrates in the
body of a mammal and yet they give a lot of energy when oxidized.
Date posted:
June 17, 2019
-
Explain why a rat, though small eats more frequently than an elephant
Date posted:
June 17, 2019
-
Briefly explain Krebs cycle in a plant cell during anaerobic respiration.
Date posted:
June 17, 2019