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1351.

Question : The occurrence of diversity among the organisms of the same species is called …………….

Answer»
1352.

Question : The numberof pair (s) of sex chromosomes in the zygote of humans is

Answer»

one
two
three
four

Answer :A
1353.

Question : ________ is the number ,size and shape of chromosomes in the cell nucleus of an organism.

Answer»

KARYOTYPE
HETEROZYGOUS
Autosome
Nucleotide

ANSWER :A
1354.

Question : The number of segments in a mature earthworm is about

Answer»

93-95
100-120
140-150
200-250 

ANSWER :B
1355.

Question : The number of chromosomes in parents and offsprings of a particular species remains constant due to

Answer»

halving of CHROMOSOMES after GAMETE formation.
doubling of chromosome after gamete formation
halving of chromosome during gamete formation.
doubling of chromosome after ZYGOTE formation

Solution :Gametes have half the NUMBER of chromosome (n) as they are formed by meiosis. After syngamy the (2N) diploidy is restored in zygote.
1356.

Question : The number of chromosomes found in human beings are________

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22 PAIRS of autosomes and 1 PAIR of allosomes
22 autosomes and 1 allosome
46 autosomes
46 PAIRSOF autosomes and 1 pair of allosomes

Answer :A
1357.

Question : The nucleotides in a helix are joined together by…………………bonds.

Answer»

SOLUTION :PHOSPHODIESTER
1358.

Question : The nuclear bomb is embedded in a deuterium and lithium containing substance.

Answer»


ANSWER :1
1359.

Question : The normalbody cell of an organism contains 28 pairs of chromosomes. The number of chromosomes present in its germ cell will be :

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28
14
56
42

Solution :N//A
1360.

Question : The niche of a species is meant for

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the specific PLACE where an organism lives
the specific function of SPECIES and its COMPETITIVE power
the HABITAT and specific functions of a spe- cies
none of these

Answer :C
1361.

Question :The new sources of energy is termed as ...............

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FOSSIL fuel
Conventional ENERGY resources
Non-conventional SOURCES of energy
conservation

Solution :non-conventional sources of energy
1362.

Question : The neurotransmitter between a motor neuron and a muscle cell is

Answer»

serotonin0
endrophin
dopamine
acetycholine

Answer :D
1363.

Question : The neurons which carries impulse from the central nervous system to the muscle fibre.

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AFFERENT NEURONS
ASSOCIATION neuron
efferent neuron
unipolar neuron

Answer :C
1364.

Question : The network of capillaries in a nephron is

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the Malpighian CORPUSCLE
BOWMAN's capsule
the GLOMERULUS
none of these

Answer :C
1365.

Question : The network of hypae is known as

Answer»

Mycelium
Rhizoids
Rhizinae
Pseudomycelium

Answer :A
1366.

Question : The net gain of ATP molecules from Kreb's cycle is,

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18
32
36
38

Answer :B
1367.

Question : The natural fonnation of ammonia in soil by the action of bacteria on proteins in decaying organic matter is called

Answer»

NITRIFICATION
denitrication
AMMONIFICATION
DENATURATION

ANSWER :C
1368.

Question : The natural system of classification was pro posed by

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DARWIN and Vries
Bentham and Hooker
Aristotle and Linnaeus
Lamarck and Darwin 

ANSWER :B
1369.

Question : The narrowest and most numerous tubes of lungs are termed as

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bronchus
alveoli
bronchioles
hilum 

ANSWER :C
1370.

Question : The name vitamin was used for the first time by

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Funk
Aristotle
Eijikmann
Hopkins

Answer :A
1371.

Question : The name Club fungi is given to basidiomycetes due to the presence of

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CLUB SHAPED basidia
club shaped basidiospores
hymenium of basidia
water DROPLET MECHANISM for DEHISCENCE of basidiospores

Answer :A
1372.

Question : The mycorrhizal relationship between a fungi and the roots of Pinus is

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saprophytic
symbiotic
epiphytic
parasitic 

ANSWER :B
1373.

Question : The movement of water from one cell of the cortex to the adjacent on in the roots is due to

Answer»

ACCUMULATION of INORGANIC salts in the cells
accumulation of organic COMPOUNDS in the cells
chemical potential gradient
water potential gradient 

ANSWER :D
1374.

Question : The movementof substancesin thephloemcan bein anydirection .

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SOLUTION :The movement of substance in the Phloem can be in any direction because, the food to reach the plant parts LIKE stem, LEAVES, flower, BUD, seeds ETC, the movement can be upwards or downwards, that is bidirectional.
1375.

Question : The mouthparts of mosquito are of

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siphoning TYPE
piercing and SUCKING type
sponging type
cutting and chewing type 

ANSWER :B
1376.

Question : The motheris responsible in determining the sex of the child. The sperm produced by the father does not determine the sex of the child.

Answer»

SOLUTION :The MOTHER is not responsible in DETERMINING the sex of the child. The sperm produced by the father, DETERMINES the sex of the child.
1377.

Question : The most rapidly dwindling natural resource in the world is ..........

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WATER
FORESTS
WIND
SUNLIGHT

SOLUTION :forests
1378.

Question : The most important advancement of mammal over reptile is

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the erythrocytes have become enucleated
presence of thick fur of hair preventing the heat loss the body 
presence of placenta, vascular CONNECTION between MOTHER & foetus
presence of DIAPHRAGM separating thoracic and ABDOMINAL cavities 

Answer :C
1379.

Question : The most common type of development of endosperm is

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CELLULOSE and pectin
helobial
nuclear
perispermic

Answer :C
1380.

Question : The most approriate equation for photosynthesis will be

Answer»

`6CO_(2) + 6H_(2)O + "SUNLIGHT" to C_(6) H_(12)O_(6) + O_(2) + 6H_(2)IO`
`6CO_(2)+ 12H_(2)O + "Sunlight + Chlorophyll" to C_(6)H_(12)O_(6) + 6H_(2)O`
`6CO_(2)+12H_(2)O to C_(6)H_(12)O_(6) + 6O_(2)+6H_(2)O`
`6CO_(2)+6H_(2)O to C_(6)H_(12)O_(6) + 6CO_(2) + 6H_(2)O`

Answer :B
1381.

Question : The most appropriate definition of a natural resource is that it is a substance commodity that is

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present only on land.
a GIFT of nature which is very USEFUL to mankind.
a man-made substance PLACED in nature.
available only in the forest.

Solution :a gift of nature
1382.

Question : The most acceptable mechanism of phloem translocation is,

Answer»

MASS FLOW
diffusion
endosmosis
PROTOPLASMIC streaming

Answer :A
1383.

Question : The most abundant protein of plant world is,

Answer»

Chlorophyll
Rubico
ATP
NADPH

Answer :B
1384.

Question : The most abundant protein of animal world is,

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Collagen
Keratin
Melanin
Actin

Answer :A
1385.

Question : The most abundant lipid in a cell membrane is

Answer»

PHOSPHOLIPID
STEROID
chloesterol
CUTIN

SOLUTION :N/A
1386.

Question : The molecule used by most animals for long term energy storage is

Answer»

starch
fat
cholesterol
glycogen

Answer :B
1387.

Question : The molecular formula of three fatty acids A, B and C present in oil or fat is C_12 H_29COOH, C_15H_29COOH and C_16H_29COOHWhich of these is derived from i) Alkane ii) Alkene and iii) Alkyne? Which of them becomes rancid earlier? How can we increase its shelf life?

Answer»

Solution :DERIVED from
i) ALKANE - `C_2H_29COOH`
ii) Alkene - `C_15H_29COOH`
iii) Alkyne - `C_16H_29COOH `
`C_16H_29COOH ` is UNSATURATED undergoes rancidity EARLIER. By hydrogenation we can increase SHELF life.
1388.

Question : The Molai Jungle is located in Kokilamukh of Jorhat district of ………………

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ASSAM
Trivandrum
Tehri
Ahmedabad

Solution :Assam
1389.

Question : The modern human beings have originated in Africa. (i) Which evidence suggests this fact? (ii) If an animal is similar to its ancestors, what does this imply?

Answer»

Solution :(i) This was shown by the help of fossil records of Homo erectus, according to which their cranial capacity had doubled. Homo erectus were the first to leave Africa and spread through Africa, Asia, and Europe. One population of H. erectus, STAYED in Africa and evolved into Homo sapiens.
(ii) This implies that from the beginning of LIFE on EARTH the inheritance of trait is going on, that RESULT in the production of existing animals that look similar to their ancestors because they have inherited traits from them and these trait that make them similar to their ancestors have not gone under evolutionary change.
1390.

Question : The mode of transmission of communicable disease is dealt by a branch of science named

Answer»

epidemiology
etiology
immunology
angiology

Answer :A
1391.

Question : The miracle rice which saved millions of lives and celebrated its 50th birthday is

Answer»

IR-S
IR-24
Atomita-2
Ponm

Solution :IR-S
1392.

Question : The microorganisms like bacteria and fungi play a key role in break down of complex organic molecules into simple inorganic substances which can be recycled. They are called _________

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SOLUTION :DECOMPOSERS
1393.

Question : The microorganisms comprising bacteria and fungi are classified as

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producers.
decomposers
tertiary consumers
primary consumers

Solution :BACTERIA and FUNGI breakdown the DEAD remains and waste products into SIMPLE inorganic substances and are called decomposers.
1394.

Question : The method of reuse is always considered better than the recycling method because...a.energy is not utilised in it.b.new materials can be produced by it.c.uniform distribution of natural resources can be done by it.d.material or equipment can be maintained for a long time by it.

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ENERGY is not UTILISED in it.
new materials can be produced by it.
uniform distribution of natural resources can be DONE by it.
material or equipment can be maintained for a LONG time by it.

SOLUTION :energy is not utilised in it.
1395.

Question : The menstrual cycle in mammals is accomplished with the help of

Answer»

PROGESTERONE and estrogen
hormones from PITUITARY GLAND only
hormones from PLACENTA only
hormones from OVARY only

Answer :A
1396.

Question : The mesogloea of Hydra contains

Answer»

NERVE cells
sensory cells
muscle cells
no cells

Answer :D
1397.

Question : The menstrual cycle ceases around 48-50 years of age and this stage is termed as menopause

Answer»


ANSWER :1
1398.

Question : Membraneformingsurfacelayerof theovumiscalled______.

Answer»

Entomophily
Exine
VITELLINE MEMBRANE
Intine

Solution :Vitelline membrane
1399.

Question : The membrane bound enzyme involved in Kreb's cycle in mitochondria is

Answer»

fumerase
cis-aconitase
succinic dehydrogenase
malate dehydrogenase

Solution :N/A
1400.

Question : The megasporangium of the angiosperms on maturation gives rise to

Answer»

cotyledons
seed
fruit
endosperm

Answer :B