If a child can receive blood from all donors, he belongs to the blood group?
إجابة
(B)
AB
2
Which of the following is NOT a function of the nucleus of a cell?
إجابة
(C)
it is reservoir of energy for the cell
3
The dominant phase in the life cycle of a fern is the?
إجابة
(B)
sporophyte
4
Parental care is exhibited by?
إجابة
(C)
birds
5
Which of the following groups of cells is devoid of true nuclei?
إجابة
(B)
monera
6
Which of the following is true of the transverse section of a dicot stem?
إجابة
(A)
the xylem is more interiorly located than the phloem
7
Which of the following is lacking in the diet of a person with kwashiorkor?
إجابة
(A)
proteins
8
The mode of nutrition of sun dew and bladder wort can be described as?
إجابة
(B)
holozoic
9
When a mixture of a food substance and Benedict's solution was warmed, the solution changed from blue to brick-red. This indicates the presence of?
إجابة
(A)
reducing sugar
10
The primary structure responsible for pumping blood for circulation through the mammalian circulatory systems is the?
إجابة
(D)
left ventricle
11
Circulation of blood to all parts of the body except the lungs is through?
إجابة
(B)
systemic circulation
12
Yeast respires anaerobically to convert simple sugar to carbon (IV) oxide and?
إجابة
(A)
alcohol
13
The sheet of muscle that separates the thoracic and the abdominal cavities is the?
إجابة
(A)
diaphragm
14
The oily substance that lubricates the mammalian hair to keep it flexible and water repellent is secreted by the?
إجابة
(B)
sebaceous glands
15
The outer layer of the kidney where the Bowman's capsules are found is the?
إجابة
(A)
cortex
16
Which of the following stimuli is likely to elicit a nastic response in an organism?
إجابة
(B)
Light intensity
17
In the male reproductive system of a mammal, sperm is stored in the?
إجابة
(C)
epididymis
18
Chemosynthetic organisms are capable of manufacturing their food from simple inorganic substances through the process of?
إجابة
(A)
oxidation
19
The part of the human gut that has an acidic content is the?
إجابة
(A)
stomach
20
I. Stomata → Spirogyra II. Alveoli → Earthworm III. Malpighian tubule → Mammal IV. Contractile vacuole → Protozoa.
Which of the above structures is correctly matched with the organisms in which it is found?
إجابة
(D)
IV
21
A food chain always begins with a?
إجابة
(C)
producer
22
Mycorrhiza promote plant growth by?
إجابة
(A)
absorbing inorganic ions from the soil
23
The barrier between maternal and fetal blood is the?
إجابة
(A)
placenta
24
The blood component that has the greatest affinity for oxygen is the?
إجابة
(C)
erythrocytes
25
Which of the following organisms is mainly found in the marine habitat?
إجابة
(C)
Dog fish
26
The two halves of the pelvic girdle are joined together at the?
إجابة
(A)
pubic symphysis
27
I. Adoption of appropriate nocturnal habits ll. Burrowing lll. Adjusting their internal body temperature. IV Possession of many sweat pores.
Which of the above are ways in which desert animals adapt to extreme heat of the environment?
إجابة
(C)
l and ll only
28
Low annual rainfall, sparse vegetation , high diurnal temperatures and cold nights are characteristic features of the?
إجابة
(B)
desert
29
The activity of an organism which affects the survival of another organism in the same habitat constitutes?
إجابة
(C)
a biotic factor
30
The average number of individuals of a species per unit area of the habitat is the?
إجابة
(A)
population density
31
The vector for yellow fever is?
إجابة
(A)
Aedes mosquito
32
The loss of soil through erosion can be reduced by?
إجابة
(B)
crop rotation
33
The protozoan plasmodium falciparum is transmitted by?
إجابة
(A)
female Anopheles mosquitoes
34
A dilute solution of phenylthiocarbamide tastes bitter to some people and is tasteless to others. This is an example of?
إجابة
(B)
discontinuous variation
35
Thyroxine and adrenalin are examples of hormones which control?
إجابة
(C)
behavioural patterns
36
A pair of genes that control a trait is referred to as?
إجابة
(A)
an allele
37
The chromosome number of a cell before and after the process of meiosis is conventionally represented as?
إجابة
(D)
2n → n
38
At what stage in the life history of a mammal is the sex of an individual set?
إجابة
(D)
at conception
39
The main distinguishing features between the soldier termite and other members of the caste are the?
إجابة
(C)
absence of wings, possession of strong mandibles and a large head
40
The flippers of a whale and the fins of a fish are examples of?
إجابة
(D)
convergent evolution
41
If both parents are heterozygous for a trait, the probability that an offspring will be recessive for that trait is?
إجابة
(C)
\(\frac{1}{4}\)
42
Use the diagram above to answer this question.In which plantation are all the trees between the height of 2-4m?
إجابة
(A)
lll
43
Use the diagram above to answer this question.Which of the following is a true feature of plantation ll?
إجابة
(A)
it has the highest number of trees of about 2m high.
44
Use the diagram above to answer this question.The movement of material in the xylem and phloem tissues of the plant are represented by the arrows labeled?
إجابة
(A)
lV and III respectively
45
Use the diagram above to answer this question.During photosynthesis, the arrow labeled ll represents the?
