Biology Topic-wise Test - 5


90 Questions MCQ Test NEET Mock Test Series & Past Year Papers | Biology Topic-wise Test - 5


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QUESTION: 1

Precocious Reproductive Development late in the growing Seasons-can be prevent by

Solution:
1.The positive effect of the low temperature treatment on the vernaliztaion of the plants can be counteracted by subsequent high temperature treatment. This is called as devernalization. 
2. The degree of devernalization decreases if the duration of the cold treatment has been longer. 
However, the devernalized plant can again be vernalized by subsequent low temperature treatment.
QUESTION: 2

What would be expected to happen if rotten fruit get mixed with unripen fruit

Solution:
QUESTION: 3

If any student x-wants to “bolt” a rossette plant, which one plant hormone expected to choose by that student for “bolting”

Solution:
QUESTION: 4
The most widely used compound as source of ethylene is
Solution:
QUESTION: 5
Hedge-making” Hormone is
Solution:
QUESTION: 6
“Lt = L0 rt” expression Represent the
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QUESTION: 7
Agent orange is
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QUESTION: 8
Gibberellins bring about
Solution:
QUESTION: 9
Antigibberrellin is
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QUESTION: 10
Size of graps increases in application of
Solution:
QUESTION: 11
Gibberellins were first isolated from a fungus Gibberella fugikuroi by
Solution:
QUESTION: 12
Bakane disease is associated with the discovery of
Solution:
QUESTION: 13
Cytokinins are mostly
Solution:
QUESTION: 14
Richmond-Long effect deals with
Solution:
QUESTION: 15
Which combination of gases suitable for fruit ripening
Solution: Ethylene is a gaseous hormone which promotes ripening of fruits. Methionine amino acid is precursor molecule for ethylene synthesis. Ethylene synthesis takes place in all parts of a plant such as roots, stems, leaves, fruits, seeds, etc. CORRECT OPTION IS (B).
QUESTION: 16
It is seen if green a bananas are sealed and stored they remain so for a long time but if they are kept with a ripe apple they ripen, why?
Solution:
QUESTION: 17
During drought condition plant produces a hormone known as
Solution:
QUESTION: 18
In Kranz anatomy” bundle sheath cells
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QUESTION: 19
I.A.A. stands for
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QUESTION: 20
Auxanometer is required for
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QUESTION: 21
Apical dominance is
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QUESTION: 22
Movement of auxin is
Solution:
QUESTION: 23
Citrate,which is oxygenated in the  position,is converted to -ketoglutarate, which is oxygenated in theposition.The enzymes that effect this change are
Solution:
QUESTION: 24
The role of   ions in the hexokinase reaction is to
Solution:
QUESTION: 25
Conversion of glucose-6-phosphate to fructose-1, 6-bisphosphate requires
Solution:
QUESTION: 26
The importance of the pentose-phosphate pathway relative to that of glycolysis may be estimated from
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QUESTION: 27
Which one is absent inhuman Erythrocytes?
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QUESTION: 28
What is the first step in glycolysis ?
Solution:
QUESTION: 29

Phenyl mercuric acetate (PMA) results in

Solution:

Phenyl mercuric acetate (PMA) results in reduced transpiration. PMA is an antitranspirant. These are some chemicals whose limited application on the leaf surface reduce or checks transpiration. A good antitranpirant increases leaf resistance but does not affect the mesophyll resistance.

QUESTION: 30
When carboxyl group of pyruvic acid is removed the latter becomes
Solution:
QUESTION: 31
-Ketoglutarate” - is 
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QUESTION: 32
 cycle aslo called as
Solution:
QUESTION: 33
Chlorophyll a consist of
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QUESTION: 34
PS-II inhibited by
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QUESTION: 35
Key product of glycolysis metabolism is
Solution:
QUESTION: 36
Respiratory path way in living cell better to consider
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QUESTION: 37

Major limiting factor for photosynthesis is

Solution:
QUESTION: 38

In C2 cycle there is synthesis of

Solution:
QUESTION: 39

In “Calvin Cycle” -

Solution:

In Calvin cycle, we can see that about 6 molecules of carbon dioxide, 18 molecules of ATP, and about 12 molecules of NADPH are utilized and on the other side about 1 molecule of glucose, 18 molecules of ADP and 12 molecules of NADP are generated.

QUESTION: 40
Connecting link between Respiration& Photosynthesis is
Solution:
QUESTION: 41
All the cells of a plants are decendent of the
Solution:
QUESTION: 42

Sigmoid growth curve best suited to

Solution:

Sigmoid growth curve

It is an S-shaped graph produced on plotting growth of living organisms in their natural environment against time. This curve is divided into three phases: lag phase, log phase or exponential phase of rapid growth, and stationary phase.

Exponential growth can be expressed as:

W1 = W0 e^rt

where,

W1 = Final size

W0 = Initial size

r = Growth rate

t = Time of growth

e = Base of natural logarithms

QUESTION: 43
PR-Promote flowering
Solution:
QUESTION: 44

Antagonastic to ABA is

Solution:
QUESTION: 45
Phytochrome - exist in
Solution:
QUESTION: 46
DNA replication occurs in 5` 3` direction because 
Solution:
QUESTION: 47
Amino acid sequence in protein synthesis is determined by sequence of
Solution:
QUESTION: 48
During transcription, heloenzyme RNA polymerase binds to DNA sequence and DNA assumes a saddle like structure at that point. The sequence is called
Solution:
QUESTION: 49
Mode of DNA replication in Escherichia coli is
Solution:
QUESTION: 50
DNA repair is carried out by
Solution:
QUESTION: 51
During transcription, RNA polymerase binds to DNA site
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QUESTION: 52
What is correct
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QUESTION: 53
What happened when heat killed S-cells along with live R-cells were injected into mice
Solution: Griffith injected mice with live strain R bacteria. The mice were found healthy and contained no living bacteria. However, when he injected the mice with the S strain, the mice died and Griffith found live S cells in their bodies. He then injected the mice with heat-killed S bacteria.
QUESTION: 54
Okazaki fragment are joined by enzyme
Solution:
QUESTION: 55
A point mutation comprising substitution of purine with pyrimidine is
Solution:
QUESTION: 56
Evolution was termed RNA world due to discovery of
Solution:
QUESTION: 57
Gene and cistron are sometimes used as synonyms because
Solution:
QUESTION: 58
mRNA is synthesised over DNA template in direction
Solution:
QUESTION: 59
RNA polymerase I catalyst synthesis of
Solution:
QUESTION: 60
During replication of DNA
Solution:
QUESTION: 61
In DNA replication, the leading strands is the one which replicates in
Solution:
QUESTION: 62
Intron is part of DNA which
Solution:
QUESTION: 63
In a DNA molecule cytosine is 18% Percentage of adenine would be
Solution:
QUESTION: 64
Double chained DNA strand is made radioactive in both its chains. It is allowed to replicate twice in non-radioactive medium. The result would be
Solution:
QUESTION: 65
DNA sequence of ATTCGATG is transcribed as
Solution:
QUESTION: 66
Reverse transcriptase is
Solution:
QUESTION: 67
During DNA replication, the strands sperate by
Solution:
QUESTION: 68
Termination of polypeptide chain is brought about by
Solution:
QUESTION: 69
Functional unit of gene that specifics synthesis of one polypeptide is
Solution:
QUESTION: 70

The two strands of DNA are held together by

Solution:

Answer is option D i.e. "Hydrogen bonds"

The hydrogen bonds are formed between the base pairs of the anti-parallel strands. Base pairs are the building blocks of the DNA double helix. Base pairs consists of two nucleotide bases bound to each other by hydrogen bonds. The DNA helix is stable because of the base pairs that stack over one another and hydrogen bonds that hold the bases together.

Hence, answer is "Hydrogen bonds"

QUESTION: 71
DNA having labelled thymidine is allowed to replicate in medium having non-radioactive thymidine. After three duplication, the DNA molecules having labelled thymidine shall be
Solution:
QUESTION: 72
New strands formation on a DNA template can be initiated only by
Solution:
QUESTION: 73
What is ture about ori
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QUESTION: 74
Solenoid is a structure of
Solution:
QUESTION: 75
Phenylketonuria, Huntington’s disease and sickle cell anaemia are caused by disorders associated with chromosomes
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QUESTION: 76
A woman with normal vision but with colour blind father colour blind father marries a colour blind man. The fourth child of the couple is a boy. This boy
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QUESTION: 77
A sudden spontaneous change in structure and action of a gene is called
Solution:
QUESTION: 78
Chromosomal doubling for producing polyploid plants is carried out by
Solution:
QUESTION: 79
Mode of inheritance of haemophilia resembles that of
Solution:
QUESTION: 80
In Melandrium, sex determination is of
Solution:
QUESTION: 81
Ishiara charts are used by opthalamologists for detecting
Solution:
QUESTION: 82
Polydactyly in man is due to
Solution:
QUESTION: 83
Hypertrichosis (hairy pinnae) is trait linked to
Solution:
QUESTION: 84
Euploidy is
Solution:
QUESTION: 85
In Drosophila, white eye colour is recessive X-linked trait while red eye colour is dominant. A white eyed female is crossed with red eyed male. The female offspring with red eye colour would be
Solution:
QUESTION: 86
Nucleosome core is made of 
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QUESTION: 87
In which of the following animal animal, the milk is squirted down the throat of the baby by muscular contraction of mother ?
Solution:
QUESTION: 88
Which of the following pair belong to category of cold blooded animals ?
Solution:
QUESTION: 89
The largest and heaviest mammals in the world is
Solution:
QUESTION: 90

Anus in vertebrates opens into a central chamber called as

Solution:

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