If a child can receive blood from all donors, he belongs to the blood group?
پاسخ دهید
(B)
AB
2
Which of the following is NOT a function of the nucleus of a cell?
پاسخ دهید
(C)
it is reservoir of energy for the cell
3
The dominant phase in the life cycle of a fern is the?
پاسخ دهید
(B)
sporophyte
4
Parental care is exhibited by?
پاسخ دهید
(C)
birds
5
Which of the following groups of cells is devoid of true nuclei?
پاسخ دهید
(B)
monera
6
Which of the following is true of the transverse section of a dicot stem?
پاسخ دهید
(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?
پاسخ دهید
(A)
proteins
8
The mode of nutrition of sun dew and bladder wort can be described as?
پاسخ دهید
(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?
پاسخ دهید
(A)
reducing sugar
10
The primary structure responsible for pumping blood for circulation through the mammalian circulatory systems is the?
پاسخ دهید
(D)
left ventricle
11
Circulation of blood to all parts of the body except the lungs is through?
پاسخ دهید
(B)
systemic circulation
12
Yeast respires anaerobically to convert simple sugar to carbon (IV) oxide and?
پاسخ دهید
(A)
alcohol
13
The sheet of muscle that separates the thoracic and the abdominal cavities is the?
پاسخ دهید
(A)
diaphragm
14
The oily substance that lubricates the mammalian hair to keep it flexible and water repellent is secreted by the?
پاسخ دهید
(B)
sebaceous glands
15
The outer layer of the kidney where the Bowman's capsules are found is the?
پاسخ دهید
(A)
cortex
16
Which of the following stimuli is likely to elicit a nastic response in an organism?
پاسخ دهید
(B)
Light intensity
17
In the male reproductive system of a mammal, sperm is stored in the?
پاسخ دهید
(C)
epididymis
18
Chemosynthetic organisms are capable of manufacturing their food from simple inorganic substances through the process of?
پاسخ دهید
(A)
oxidation
19
The part of the human gut that has an acidic content is the?
پاسخ دهید
(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?
پاسخ دهید
(D)
IV
21
A food chain always begins with a?
پاسخ دهید
(C)
producer
22
Mycorrhiza promote plant growth by?
پاسخ دهید
(A)
absorbing inorganic ions from the soil
23
The barrier between maternal and fetal blood is the?
پاسخ دهید
(A)
placenta
24
The blood component that has the greatest affinity for oxygen is the?
پاسخ دهید
(C)
erythrocytes
25
Which of the following organisms is mainly found in the marine habitat?
پاسخ دهید
(C)
Dog fish
26
The two halves of the pelvic girdle are joined together at the?
پاسخ دهید
(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?
پاسخ دهید
(C)
l and ll only
28
Low annual rainfall, sparse vegetation , high diurnal temperatures and cold nights are characteristic features of the?
پاسخ دهید
(B)
desert
29
The activity of an organism which affects the survival of another organism in the same habitat constitutes?
پاسخ دهید
(C)
a biotic factor
30
The average number of individuals of a species per unit area of the habitat is the?
پاسخ دهید
(A)
population density
31
The vector for yellow fever is?
پاسخ دهید
(A)
Aedes mosquito
32
The loss of soil through erosion can be reduced by?
پاسخ دهید
(B)
crop rotation
33
The protozoan plasmodium falciparum is transmitted by?
پاسخ دهید
(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?
پاسخ دهید
(B)
discontinuous variation
35
Thyroxine and adrenalin are examples of hormones which control?
پاسخ دهید
(C)
behavioural patterns
36
A pair of genes that control a trait is referred to as?
پاسخ دهید
(A)
an allele
37
The chromosome number of a cell before and after the process of meiosis is conventionally represented as?
پاسخ دهید
(D)
2n → n
38
At what stage in the life history of a mammal is the sex of an individual set?
پاسخ دهید
(D)
at conception
39
The main distinguishing features between the soldier termite and other members of the caste are the?
پاسخ دهید
(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?
پاسخ دهید
(D)
convergent evolution
41
If both parents are heterozygous for a trait, the probability that an offspring will be recessive for that trait is?
پاسخ دهید
(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?
پاسخ دهید
(A)
lll
43
Use the diagram above to answer this question.Which of the following is a true feature of plantation ll?
پاسخ دهید
(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?
پاسخ دهید
(A)
lV and III respectively
45
Use the diagram above to answer this question.During photosynthesis, the arrow labeled ll represents the?
