Which of the following pairs are fully adapted to terrestrial life?
উত্তর
(D)
Flowering plants and conifers
3
Which of these animals is radially symmetrical?
উত্তর
(B)
Hydra
4
Which of the following has cones?
উত্তর
(B)
Gymnosperms
5
For effective functioning of a bird's quill feather, hooks fit on the ridge of the
উত্তর
(C)
barbules
6
Which of the following is NOT true of spirogyra?
উত্তর
(C)
Consist of branched filaments
7
Which of the following lacks chaetae, tentacles and antennae?
উত্তর
(C)
Millipede
8
Incomplete metamorphosis occurs in the
উত্তর
(B)
grasshopper
9
Fishes are cold blooded because their body temperature is
উত্তর
(C)
dependent on that of their surroundings
10
When the original king and queen of termites die, they are replaced by
উত্তর
(D)
developing nymphs nurtured as secondary reproductives
11
The male cockroach differs from the female by having
উত্তর
(B)
a pair of style
12
The fins making up the limbs of the bony fish are
উত্তর
(C)
pelvic and pectoral
13
The stem differs from the root in having the xylem and phloem strands
উত্তর
(A)
on the same radii
14
Oxygen liberated during photosynthesis has been demonstrated to come from
উত্তর
(C)
water
15
Which of these is a trace element?
উত্তর
(B)
Copper
16
The main organic substances found in the human body are
উত্তর
(C)
fat, carbohydrates and protein
17
Which of the following elements is essential for the formation of haemoglobin?
উত্তর
(D)
Iron
18
The severe deficiency of vitamin C leads to
উত্তর
(D)
scurvy
19
In addition to the high calories derived from fats and oils, they are
উত্তর
(C)
used as insulators for cold
20
The extract from food substance reacting with sodium hydroxide and copper sulphate solutions will produce violet to purple coloration if
উত্তর
(C)
protein is present
21
The three important organs that are situated close to the stomach are
উত্তর
(D)
gall bladder, pancreas and spleen
22
Evidence that a tooth is a living part of the mammalian can be found within the
উত্তর
(B)
pulp cavity
23
Blood circulation in a mammalian is said to be double because
উত্তর
(A)
it passes twice through the heart in a complete circuit
24
Which is the correct order of water loss from the leaf? 1 Mesophyll 2 Veins 3 Substomatals cavity 4 Stomata
উত্তর
(C)
2 → 1 → 3 → 4
25
The aperture between the left auricle and the left ventricle is guarded by the
উত্তর
(D)
bicuspid valve
26
A major limitation in the use of the potometer for measuring the rate of transpiration is that
উত্তর
(D)
the movement of the air buble in the potometer cannot be timed accurately
27
Which of the following statement is NOT correct with respect to inhalation in mammals? The
উত্তর
(B)
diaphragm is raised
28
The equation that can be used to summarize the process of anaerobic breakdown of sugar is
উত্তর
(D)
C6H12O6 2C2H5OH + 2CO2 + energy
29
If a person is bitten by a snake on the leg, it is advisable for him to
উত্তর
(D)
Keep still and apply a tourniquet above the wound
30
Deamination occurs in the
উত্তর
(D)
liver
31
In the mammalian skin, melanin and keratin are contained in the
উত্তর
(D)
malpighian layer
32
Two main distinguishing features of the cervical vertebra are the presence of
উত্তর
(A)
short neural spine and vertebraterial canal
33
Nastic movement is
উত্তর
(B)
non-directional
34
Gestation in mammals is the period
উত্তর
(C)
of development from zygote to birth
35
If a woman who is a carrier of sickle cell trait (AS) married a man who is a sickler (SS) and they had four children, how many of them would be normal?
উত্তর
(D)
None
36
Which of the following is an example of discontinuous variation?
উত্তর
(B)
left handedness
37
The hormones which regulates the amount of glucose in the blood is called
উত্তর
(C)
insulin
38
An instrument that can be used to demonstrate phototropism and geotropism in plants is the
উত্তর
(C)
klinostat
39
In an ecosystem, animals which feed directly on plants are called
উত্তর
(B)
primary consumers
40
In an agricultural ecosystem, the biotic component consists of
উত্তর
(A)
crop, pest and beneficial insects
41
Which of these disease CANNOT be prevented by immunization?
উত্তর
(D)
onchocerciasis
42
Which of the following ecological factors are common to both terrestrial and aquatic habitats?
উত্তর
(A)
Rainfall, temperature and light
43
In community, bacteria and fungi are referred to as
উত্তর
(B)
decomposers
44
The swollen shoot disease of cocoa tree is caused by a
উত্তর
(A)
virus
45
A larger percentage of tropical soils tends to be acidic because they
উত্তর
(D)
lose lime and potash from the top soil through rain action
