In a dicot leaf, guard cells differ from other epidermal cells because they
Respuesta
(D)
contain chloroplast
3
Which of the following structure is NOT found in the female agama lizard?
Respuesta
(E)
Nuchal crest
4
Herbs differ from shrubs because they
Respuesta
(C)
do not become woody
5
If an organic compound has its hydrogen: oxygen ratio as 2:1, it is likely to be
Respuesta
(B)
a cabohydrate
6
Which of the following elements are necessary for the formation of chlorophyll in a plant?
Respuesta
(A)
magnesium and iron
7
Which of the following statements is NOT true of mammalian erythrocytes?
Respuesta
(E)
They have nuclei at maturity
8
In woody plants, grass and water vapour are transported across the stems by the
Respuesta
(A)
xylem fibres
9
Which of the following substance is not found in urine?
Respuesta
(D)
Calcium chloride
10
The kidneys of all vertebrates act as osmoregulators. This means that they
Respuesta
(B)
regulate osmotic processes
11
The movement of plant in response to external stimulus of no particular direction is
Respuesta
(D)
nastic movement
12
The part of the mammalian brain responsible for maintaining balance is the
Respuesta
(C)
cerebellum
13
In the onion bulb, food is stored in the
Respuesta
(E)
leaf base
14
Groundnut is not really a 'nut' in the biological sense because
Respuesta
(B)
pericarp is not hard and tough
15
What type of fruit is formed from a single flower having several carpels?
Respuesta
(C)
Aggregrate fruit
16
28 g soil sample was heated to a constant weight of 24 g. When further heated to red hot and cooled, it weighed 18 g. What is the percentage of humus in the soil?
Respuesta
(A)
22.2
17
Which of the following diseases is NOT caused by a virus?
Respuesta
(B)
Maize rust
18
A centipede differs from a millipede by its
Respuesta
(D)
poison claws
19
An organism having one pair of identical genes is
Respuesta
(D)
a homozygote
20
Plants which can survive in places where the water supply is limited are
Respuesta
(C)
xerophytes
21
Banana, plantain and pineapple can be grouped together because they
Respuesta
(C)
produce suckers
22
One disease NOT caused directly by bacteria is
Respuesta
(A)
malaria
23
In what order do the following structure develop during the metamorphosis of the toad? 1. External gills 2. Internal gills 3. Forelimbs 4.Hindlimbs 5. Mouth
Respuesta
(B)
15243
24
The dental formula of a i(3/3); c(1/1); pm(4/4; m(2/3) = 42 represent that of a
Respuesta
(D)
dog
25
Which of the following statements is NOT true of insectivorous plants?
Respuesta
(B)
They attract insects simply because of pollination
26
which of these worms is beneficial to man?
Respuesta
(D)
Earthworm
27
Starting from the skull end the vertebrate are arranged in the following order
Respuesta
(D)
atlas, axis, cervical, thoracic and lumber
28
which of the following diseases could be exclusively associated with river basin?
Respuesta
(C)
Onchocerciasis
29
Which of the following represents the evolutionary sequence in these plants? 1. Flowering plants 2. Ferns 3. Mosses 4. Algae 5. Conifers
Respuesta
(E)
4 → 3 → 2 → 5 → 1
30
Which of the following statements on the mammalian circulatory system is NOT true?
Respuesta
(A)
Blood in the pulimonary artery is richer in oxygen content than blood in the pulmonary vein
31
In a positive phototropic response of a coleoptile, the region of greatest curvature is brought about by the
Respuesta
(D)
concentration of auxins in the region of curvature
32
The tuber cassava is NOT a stem tuber because it
Respuesta
(D)
Lacks axillary buds
33
The function of the ossicles (malleus, incus and stapes) in the mammalian ear is
Respuesta
(A)
Transmission of vibrations
34
Which of the following instruments is used for determining turbidity of water?
Respuesta
(B)
secchi disc
35
Which of the following is NOT a characteristic of monocot plants?
Respuesta
(A)
Occurrence of secondary thickening
36
Which sequence represents the correct order of organisms un a food chain? 1. Toad 2. Mucuna 3. Grasshopper 4. Snake 5. Hawk
Respuesta
(E)
2 → 3 → 1 → 4 → 5
37
In rhizopus carbohydrate is stored in the form of
Respuesta
(C)
Glycogen
38
Which of the following statements about the rate of transpiration is INCORRECT? It is
Respuesta
(C)
Unaffected by humidity
39
‘Jointed skeleton’ is absent in the
Respuesta
(D)
Snail
40
Which of the following statements about the dentition of man is INCORRECT ? man has
Respuesta
(E)
A total of six molars
41
When spirogyra cell is immersed in a salt solution more concentrated than its cell sap, it
Respuesta
(D)
Loses water and shrivels
42
Urea is produced in the
Respuesta
(A)
Liver
43
What is the genetic ratio of the F2 generation if members of F generation are allowed to self-pollinate?
Respuesta
(B)
3 tall : 1 short
44
The path taken by glucose from the ileum to the heart is
