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20301.

Question : Auxins fail to enhance the growth of intact plants.

Answer»

Solution :Because the REQUIRED amount of auxins is ALREADY PRESENT in INTACT plant.
20302.

Question : Auxins are growth hormones capable of promoting cell elongation. They have been used in horticulture to promote growth, flowering and rooting. Write a line to explain the meaning of the following terms related to auxins. (a) auxin precursors (b) antiauxins (c) synthetic auxins

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Solution :(a) Auxin precursors : The SUBSTANCES that PRODUCE the auxin are called auxin precursors. For example, tryptophan. Tryptophans is the auxin precursors.
(B) Antiauxins : The substance that inhibit action of auxins e.g. P-chlorophenoxy isobutyric acid (PCIB), TIBA [Triodobenzoic acid]
(c) Synthetic auxins : The artificially synthesised chemicals having auxin like property are called synthetic auxins. For example NAA (Naphthalene acetic acid) and 2, 4-D [2, 4-Dichlorophenoxyacetic acid]
20303.

Question : Auxin was first isolated from .......

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CORN GRAIN oil
HUMAN blood
Human URINE
Rice BRAN oil

Solution :Human urine
20304.

Question : Auxin in plant means for

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CELL elongation
fruit ripening
cell division
cell differentiation

Answer :C
20305.

Question : Autonomic nervous and viterous humour are divided by

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REFLEX actions
sensory organs
internal organs
none of these

20306.

Question : Australian Acacia, Turmeric, Zaminkhand, Nerium, Cacti, Pea, Pistia, Chrysanthemum, Nepenthis, Pine apple and garlic, out of these how many of them exhibit leaf modifications

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6
11
5
7

Answer :D
20307.

Question : Aurela is

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sessile
umbrella -SHAPED
polyp like
polymorphic

Answer :B
20308.

Question : Attempt titrating an amino acid against a weak base and discover the number of dissociating (ionizable) functional groups in the amino acid.

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Solution :On titrating against a weak base the amino ACIDS ionizes into -`NH_2C` amino GROUPS -COOH (CARBOXYL group).
20309.

Question : Attacus ricini produces ........... silk.

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Muga
Tassar
Mulberry
ERI

SOLUTION :Eri
20310.

Question : Atrium and ventricles

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SOLUTION :
20311.

Question : Atrial wall of our heart secretes ANF.

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ANSWER :TRUE
20312.

Question : ATPase of the type muscle is located in

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actinin
troponin
myosin
actin

Solution :The head of each myosin MOLECULE contains an enzyme myosin ATPase. In the presence of myosin ATPase, `Ca^(2+)` and `MG^(2+)`, IONS ATP breaks down into ADP and inorganic PHOSPHATE, releasing ENERGY in the head.
`ATPoverset("Myosin Atpase")underset(Ca^(2+), Mg^(2+))(rarr)ADP+P i+"Energy"`
20313.

Question : ATPaseenzyme consists of two parts. What are those parts ? How are they arranged in the thylakoid membrane ? Conformational change occur in which part of the enzyme ?

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Solution :`F_(1)` headlike part (It is a part having protein) located towards STOMA in PERIMETER region and has space to synthesize ATP by connecting ADP + pi.
(b) `F_(0)` is a protein located inside the membrane. It functions as a pathway to PASS the proton.
Arrangement : `F_(0)` part is arranged inside theThylakoid mambrane. `F_(1)` part is located towards stroma of chloroplast of ATPase.
Changes : Definite changes take PLACE in `F_(1)` part of ATp is formed by connecting ADP + Pi through ATpase.
20314.

Question : ATPase of the muscle is located in

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Actinin
troponin
MYOSIN
ACTIN

ANSWER :C
20315.

Question : ATPase :

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Solution :Lcation : In innermembrane of MITOCHONDRIA
Function : As a PATHWAY for TRANPORT of protein for ATPformation.
20316.

Question : ATP produced during glycolysisis a result ofsubstrate level phosphorylation . Explain.

Answer»

Solution :STROMA basedphosphorylation is such AMETABOLIC process that forms either ATP orGTP. Whicheither attacheswith ADP or GDP with phosphate and are formed.

Matric based phosphorylation
In Glycolysismatrics based phosphorylation takes place in two steps.
(a)2 molecules of 1, 3biphosphoglycericacid combine with2 molecules of ADP then,
1, 3 biphosphoglyceric acid + 2ADP
`underset(Mg^(+2)) overset("Phospho transferase ") to ` 2phosphoglyceric acid + 2ATP
(B) 2 molecules of phosphoenolpyruvic acid combine with 2 molecules of ADP then,
2 molecules of pyruvicacid and 2 molecules ofATPare formed
2 PHOSPHOENOL pyruvicacid + 2ADP
`underset(Mg^(+2))to overset ("Pyruvate kinase ") to ` 2 pyruvicacid + 2ATP
20317.

Question : ATP is required for active transport.A. TrueB. False

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ANSWER :FALSE
20318.

Question : What is an universal energy currency of the cell?

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Solution :Respiration is responsible for generation of ATP. The discovery of ATP was made by Karl Lohman (1929). ATP is a nucleotide CONSISTING of a base-adenine, a pentose sugar - RIBOSE and three phosphate GROUPS. Out of these phosphate groups the last two are attached by high energy rich bonds (figure). On HYDROLYSIS, it releases energy (7.3 K cal or 30.6 KJ/ATP) and it is found in all living cells and hence it is called universal energy currency of the cell. ATP is an instant source of energy within the cell. The energy contained in ATP is used in synthesis carbohydrates, proteins and lipids. The energy transformation CONCEPT was established by Lipman. (1941).
20319.

Question : ATP is a

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NUCLEOTIDE
NUCLEOSOME
Nucleside
Purine

Answer :A
20320.

Question : ATP can be formed in the photosynthesizing plant cells by:

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Photophosphorylation
Oxidative PHOSPHORYLATION
SUBSTRATE LEVEL phosphorylation
All of the above

ANSWER :A
20321.

Question : ATP ase enzyme needed for muscle contraction of located in

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ACTIN
troponin
myosin
actin

20322.

Question : ATPase enzyme needed for muscle contraction is located in

Answer»

ACTIN
TROPONIN
MYOSIN
actin

Solution :myosin
20323.

Question : ATP ase enzyme needed for muscle contraction is located in

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ACTINIC
TROPONIN
MYOSIN
Actin

Answer :C
20324.

Question :ATP :

Answer»


ANSWER :ADENOSINE TRIPHOSPHATE
20325.

Question : Atoms needed in very small amounts function mainly as ………………………………… of enzymatic reactions.

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SOLUTION :COFACTORS
20326.

Question : Atmospheric input is negligible in

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CARBON cycle
phosphorus cycle
oxygen cycle
nitrogen cycle

Answer :B
20327.

Question : Atlas and axis are a part of:

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thoracic
VERTEBRAE
cervical vertebrae
lumbar vertebrae

20328.

Question : Atheroma may partially block the ............ and reduce the blood supply to the heart.

Answer»

SOLUTION :CORONARY ARTERY.
20329.

Question : water soluble pigments found in plant cell vacuoles are

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XANTHOPHYLLS
Chlorophylls
Carotenoids
ANTHOCYANINS

ANSWER :D
20330.

Question : At, which temperature do C_(3)plants work best?

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SOLUTION :TEMPERATURE of APP. `25^(@) C.`
20331.

Question : Atactostele is present in

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DICOT STEM
MONOCOT stem
Dicot ROOT
Monocot root

Answer :B
20332.

Question : At which step of respiration, hydrogen of NADH_(2) is used ?

Answer»

Solution :The HYDROGEN atoms accepted by `NADH_(2)` during glycolysis are introduced to route I of ETS. In this route 3 ATP MOLECULES are produced.
20333.

Question : At which stage, the homologous chromosomes separate due to repulsion, but are yet held by chiasmata?

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a) Pachytene
B) Diplotene
c) Diakinesis
d) Zygotene

Answer :B
20334.

Question : At which stage of mitosis , chromatids separated and passes to different poles

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Prophase
Metaphase
Anaphase
Telophase

Answer :C
20335.

Question : At which stage of mitosis chromatids separate and passes to different poles ?

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PROPHASE
Metaphase
ANAPHASE
TELOPHASE

Answer :C
20336.

Question : At which stage of meiosis does the genetic constitution of gametes is finally decided

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METAPHASE I
Anaphase II
Metaphase II
Anaphase I

Answer :D
20337.

Question :At which stage of meiosis does the genetic constitution of gametes is finally decided

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METAPHASE I
ANAPHASE II
Metaphase II
Anaphase I

ANSWER :D
20338.

Question : At which of the following stages of cell cycle proteins and microtubules, required for mitosis, are synthesized ?

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`G_2` PHASE
`G_1` phase
INTERPHASE
M

ANSWER :A
20339.

Question :At which stage of HIV infection does one usually show symptoms of AIDS?

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When the infecting retrovirus enters host cells
When viral DNA is produced by reverse TRANSCRIPTASE
When HIV replicates rapidly in helper T-lymphocytes and DAMAGES large number of these
Within 15 day of sexual contact with an infected person.

Answer :C
20340.

Question :At which pH lysosomal enzymes remain active

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PH - 5
PH - 7
pH - 8
pH - 1.0

Answer :A
20341.

Question : At which junctions are tonofibrils anchored?

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SOLUTION :MACULA ADHERENS.
20342.

Question : At what stage of endosperm development, you will observe nuclear or cellular type of endosperm?

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When DIVISIONS start in embryo
When embryo is heart-shaped
Just after division of PRIMARY ENDOSPERM nucleus
MATURE stage of endosperm

Answer :C
20343.

Question :At what stage of cell cycle does DNA synthesis take place ?

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Solution :DNA is SYNTHESIZED during S (synthetic PHASE) of INTERPHASE of CELL.
20344.

Question : At the venous end of the capillary bed, the osmotic pressure is

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GREATER than the hydrostatic pressure
Result in net outflow of fluids
RESULTS in net absorption of fluids
No CHANGE occurs.

Answer :C
20345.

Question : At Tuticorin region, the pearl oyster diving people have some changes in their blood. State the reasons for it.

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Solution :When a person descends deep into the sea, the pressure in the surrounding water increases which causes the lungs to DECREASE in volume. This decrease in volume increases the partial pressure of the gases within the lungs. This effect can be beneficial, because it tends to drive additional oxygen into the circulation, but this BENEFIT also has a risk, the increased pressure can also drive nitrogen gas into the circulation. This increase in blood nitrogen content can lead to a condition called nitrogen narcosis. When the diver ascends to the surface too quickly a condition called ''bends'' or decompression sickness occurs and nitrogen comes out of solution while still in the blood FORMING bubbles, Small bubbles in the blood are not harmful, but large bubbles can lodge in small capillaries, blocking blood flow or can PRESS on nerve endings. Decompression sickness is associated with pain in joints and museles and neurological PROBLEMS including stroke. The risk of nitrogen narcosis and bends is common in scuba divers.
20346.

Question : At the venous end of the capillary bed, the osmotic pressure is ............

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Greater than the hydrostatic PRESSURE
Result in net outflow of FLUIDS
Results in net absorption of fluids
No CHANGE occurs

SOLUTION :Greater than the hydrostatic pressure
20347.

Question : At the time of germination of zygospore in Spirogyra,how many haploid nucleus/nuclei is/are functional or on germination, each zygospore of Spirogyra produces how many plants ?

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3
4
2
1

Solution :At the time of germination of zygospore in SPIROGYRA, 1 haploid NUCLEI is functional/on germination, eachzygospore of Spirogyra PRODUCES 1 plant.
20348.

Question : At the time of heavy rain, minerals in upper layers of the soil move downward by a process known as:

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WEATHERING
leaching
erosion
smearing

Answer :B
20349.

Question : At the end of which stage does cell enter mitosis ?

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`G_1`- PHASE
S- phase
`G_2`- phase
M-phase

ANSWER :C
20350.

Question : At the metaphase plate during metaphase I of meiosis, there are

Answer»

SINGLE chromosomes
always twenty-three chromosomes
bivalents
unpaired DUPLICATED chromosomes

Answer :C