The animals that move by means of flagella include
Respuesta
(A)
Chlamydomonas and Euglena
4
When oil is poured into the breeding site of mosquitoes, it
Respuesta
(C)
suffocates the pupae
5
The structure found only in the plant cells are
Respuesta
(C)
cell wall and chloroplast
6
A flower that has both stamens and pistils is said to be
Respuesta
(C)
perfect
7
In the diagram, the hawk is
Respuesta
(C)
a tertiary onsumer
8
Example of competitors are
Respuesta
(B)
snake and lizard
9
one of the adaptation of life on trees by a monkey is its possession of digits which are
Respuesta
(C)
opposable
10
The community of plants in which the same species occur from year to year is the
Respuesta
(D)
climax vegetation
11
The most common means of transmiting the Acquired Immune Deficiency Syndrome (AIDS) is
Respuesta
(C)
through sexual intercourse
12
Plants tend to prevent overcrowding by means of efficient
Respuesta
(D)
seed dispersal
13
The physical and climatic factors of a region primarily determine the
Respuesta
(D)
community of organisms in the region
14
A step in the movement of energy through an ecosystem is a description that best fits the term
Respuesta
(B)
trophic level
15
In a field experiment, the frequency of water leaf was observed to be 48 after 20 tosses of a 2m\(^2\) quadrat. What is the density of the plants in the field?
Respuesta
(A)
1.2 per m2
16
The supporting tissue in xylem is most poorly developed in
Respuesta
(C)
submerged water plants
17
The addition of lime to clayed soil serves to
Respuesta
(D)
improve capillary action
18
The excessive use of agro-chemicals could lead to the pollution of
Respuesta
(C)
fresh water
19
In a population study using the transect method, a student is likely to record the highest number of species in?
Respuesta
(B)
a guinea savanna
20
In his theory of evolution, Darwin implied that
Respuesta
(B)
the most successful organisms are those that best adapt to their environment
21
The carnassial teeth of a carnivorous animal consist of the
Respuesta
(A)
last upper premolar and the first lower molar
22
Birds which are large with long straight pointed beaks, long necks and long legs are likely to be
Respuesta
(B)
fish catchers
23
A feature of the caste system of bees and termites ia that
Respuesta
(A)
the workers are sterile
24
The structure that is common in the embryos of mammals, amphibians, birds, fishes and reptiles and which is an evidence of their common ancestry is the
Respuesta
(D)
gill-silts
25
Animals aestivate when the environment in which they live becomes
Respuesta
(A)
hot and dry
26
Examples of organisms in which extracellular digestion occurs are?
Respuesta
(D)
rhizopus, housefly and hydra
27
The mammalian erythrocytes differ from the leucocytes at maturity because the erythrocytes are
Respuesta
(B)
discoid and enucleated
28
The presence of endoskeleton is characteristic of
Respuesta
(B)
vertebrata
29
The capture and digestion of insects by a pitcher plant is a special form of nutrition termed
Respuesta
(B)
heterotrophic
30
Which of the following statement is correct about the experiment?
Respuesta
(D)
The leaves outside the flask serve as control
31
The experimental set-up can be used to demonstrate that
Respuesta
(D)
carbon (IV) oxide is necessary for photosynthesis
32
When a marine fish was taken from the ocean and put in a tank of fresh water, it died after a short period because
Respuesta
(B)
the body cells of the fish swelled and burst as a result of the hypotonic fresh water
33
Which of the following pairs of organ is located in the anterior half of the mammalian body cavity?
Respuesta
(C)
Lungs and heart
34
The mode of nutrition exhibited by a tapeworm is
Respuesta
(C)
parasitic
35
The organ located within the duodenal loop in the mamal is the
Respuesta
(B)
pancreas
36
In which of the following groups of fruits is the pericarp inseparable from the seed coat?
Respuesta
(D)
Crayopsis
37
A person that is obese must avoid meals containing
Respuesta
(B)
margarine and butter
38
Tissue respiration is important for the
Respuesta
(C)
release of energy for the body use
39
The function of the absorption is performed by the structure labelled
Respuesta
(B)
II
40
The structure labelled I represented the
Respuesta
(D)
pericycle
41
The gland usually found in the position labelled I is the
Respuesta
(D)
pituitary
42
To select and retain the desirable trait of large body size which a farmer has observed in his herd, the farmer needs to
Respuesta
(C)
inbreed the animals in his herd
43
In a population of living things, the parameters of size, height, weight and colour are examples of
Respuesta
(B)
continuous variation
44
If XN is the dominant allele for normal vision and Xn the recessive allele for colour blindness, a boy with the genotype YXn will be
Respuesta
(B)
be colour-blind
45
The first four children of a couple were all girls. The probability that the fifth will also be a girl is
