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21451.

Question :A well watered potted herbaceous plant shows wilting in the afternoon of adry sunny day. Give reason.

Answer»

Solution : During NOON, the rate of transpiration BECOMES higher than the rate of waterabsorption by plant. It causes LOSS of TURGIDITY and LEADS to wilting
Discussion
21452.

Question : A waxy layer present outside the epidermal cells is absent in

Answer»

ROOTS
MONOCOT LEAVES
DICOT Leaves
Dicot stems

Answer :A
Discussion
21453.

Question : A : Water is not required for fertilization process in ferns. R: Malic acid of archegonial neck attract antherozoids.

Answer»

A and R both are CORRECT and R is correct explanation of A. 
A and R are correct but R is not explanation of A. 
A is correct and R is FALSE. 
A and R are false. 

ANSWER :C
Discussion
21454.

Question :A : Walls of left ventricle are thicker than that of right ventricles. R : Left ventricles pump blood to the farthest end of body.

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A and B both are correct and RIS correct explanation of A .
A and RARE correctbut Ris notexplanationof A.
A is correctand R is false
A and Rare false

ANSWER :A
Discussion
21455.

Question : (a) Visible spectrum - 390-763nm (b) Photon - 3900Å - 7630 Å (c) Quantum - U-V rays (d) Visible light - Gamma rays

Answer»


SOLUTION :VISIBLE SPECTRUM - 390-763nm
Discussion
21456.

Question : A virus is considered as a living organism and an obligate parasite when inside a host cell. But virus is not classified along with bacteria or fungi. What are the characters of virus that are similar to non-living objects?

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Solution :Characters of virus that are SIMILAR to NONLIVING objects.
(a) They have inert CRYSTALLINE STRUCTURE OUTSIDE the living cell.
(b) They do not have any cell organelles.
Discussion
21457.

Question : (A) Vestigial organ - four chambered heart in reptiles (B) Analogous structure - wings of birds (C ) Homologous structure - bones in the fore limbs veributes (D) Atavistic organ - tail in human body

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A only
B and C
C and D
C only

Answer :A
Discussion
21458.

Question : A vesselless piece of stem possessing prominent sieve tubes would belong to

Answer»

Pinus
Eucalyptus
Grass
Trochodendron

Solution :Trochodendron The species of this GENEUS have a very UNIQUE feature of the ANGIOSPERMS, i.e, it lack VESSEL elements in its WOOD, but has prominent sieve tube cells.
Discussion
21459.

Question : A vessel less piece of stem possessing prominent sieve tubes would belong to (A) Pines (B) Eucalyptus (C) Grass (D) Trochodendron

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Pinus
Eucalyptus
Grass
Trochodendron

Solution :Trochodendron
In SPECIES of this type UNIQUE CHARACTERISTICS of ANGIOSPERMS is found. It does not possess xylem elements in wood. But has clear SIEVE tubes.
Discussion
21460.

Question : A:Veins have valves which open away from the heart. R : Veins distribute blood to the various parts of body.

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A and B both are correct and Ris correct explanation of A .
A and RARE correctbut Ris notexplanationof A.
A is correctand R is false
A and Rare false

ANSWER :D
Discussion
21461.

Question : A vasculum has 300 leaves. 15% of these belong to Mustard, 20% to Calotropis 10% to Guava, 15% to sunflower and the remaining to Alstonia. If 6 leaves are present at each node of Alstonia, what is the total number ofnodes seen in various twigs present in vasculum?

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145
165
155
175

Answer :C
Discussion
21462.

Question : A vascular bundle without cambium in between xylem and phloem is called

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RADIAL
CLOSED
OPEN
BICOLLATERAL

Answer :B
Discussion
21463.

Question : A: Urochordates and cephalochordates are often called invertebrates chordates R : They are connecting link between invertebrates and the chordates(A) A and R both are correct and R is correct explanation of A.(B) A and R are correct but R is not explanation of A.(C) A is correct and R is false.(D) A and R are false

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A and R both are CORRECT and R is correct EXPLANATION of A. 
A and R are correct but R is not explanation of A. 
A is correct and R is false. 
A and R are false

Answer :C
Discussion
21464.

Question : Assertion :: Nuptial flight is a unique flight taken the queen beefollowedbyseveral drones. Reasons :The queen bee produces a chemical substance calledpheromone.The drones inthat area are attracted tothe pheromone andthenmating takes place.

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SOLUTION :NUPTIAL FLIGHT
Discussion
21465.

Question : A unit of classification is generallyreferred as

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RANK
CATEGORY
TAXON
All the above

ANSWER :C
Discussion
21466.

Question : A unique feature of birds is

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homeothermy
feathers
4 - CHAMBERED HEART
scales on legs

Answer :B
Discussion
21467.

Question : A unicellular form in red algae………..

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Porphyridium
Porphyra
Carolina
Geotrichum

Answer :A
Discussion
21468.

Question : A unicellular ascomycetes member is

Answer»

PHYTOPHTHORA
Saccharomyces
Sclerospora
RHIZOPUS

ANSWER :B
Discussion
21469.

Question : A typical value of resting membrane potential is

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`-100 mV`
`-70 mV`
`-40 mV`
`-60 mV`

Solution :The ELECTRICAL potential DIFFERENCE across the resting plasma MEMBRANE is CALLED as the resting potential.Its value is -70mV
Discussion
21470.

Question : A typical fat molecule is made up of

Answer»

one glycerol and one fatty ACID MOLECULE
three glycerol and three fatty acid MOLECULES
three glycerol molecules and one fatty acid molecule
one glycerol and three fatty acid molecules

Answer :D
Discussion
21471.

Question : A typical anther of an angiosperm is

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HAPLOID, bisporangiate
diploid, tetrasporangiate
diploid bisporangiate
haploid, tetrasporangiate

Answer :B
Discussion
21472.

Question : A typical angiosperm flower consists of four floral parte. Glve the names of the floral parts and thelr arrangements sequentially.

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Solution :The four whorls of typical flower of angiosperm are as follow :
(a) CALYX : It is the OUTERMOST layer of the flower . Its units are called sepals. It is generally of GREEN colour and protects the flower in bud stage.
(b) Corolla : It is made up of PETALS . Generally they are shining , which attract insects for pollination.
(c) Androecium : It is made up of stamens. It is a male reproductive organ. Each stamen has stalk and Anther. It has pollen sac and pollen GRAINS. (d) Gynoecium : It is a female reproductive organ. It has more than one curpels. Each carpel has anther, pollen tube and ovary. (Typical Power Dhatura)

Discussion
21473.

Question : A typical angiospermic embryo sac at maturity is eight nucleate and

Answer»

SINGLE CELLED
) FOUR celled
seven celled
eight celled

Answer :C
Discussion
21474.

Question : A typical angiosperm flower consists of four floral parts.Give the names of the floral parts and their arrangements sequentially

Answer»

SOLUTION : CALYX, COROLLA, ANDROECIUM, GYNOECIUM.
Discussion
21475.

Question : A: Tympanum separates external ear from middle ear R : Tympanum transmits vibrations to internal ear via ear ossicles.

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A and R both are CORRECT and R is correct EXPLANATION of A. 
A and R are correct but R is not explanation of A. 
A is correct and R is FALSE. 
A and R are false 

ANSWER :B
Discussion
21476.

Question : A true fat with three molecules of fatty acids is called ....

Answer»

SOLUTION :TRIGLYCERIDE
Discussion
21477.

Question : A true fruit is the one where

Answer»

only OVARY of the flower DEVELOPS into fruit
ovary and calyx of the flower develops into fruit
ovary, calyx and THALAMUS of the flower develops into fruit
all FLORAL whorls of the flower develops into fruit

Solution :only ovary of the flower develops into fruit
Discussion
21478.

Question : A triploblastic, unsegmented animal with complete alimentary canal could be a

Answer»

ROUNDWORM
Planaria
liverfluke
HYDRA

Discussion
21479.

Question : A tree is believed to be releasing oxygen during night time. Do you believe the truthfulness of this statement?

Answer»

SOLUTION :Oxygenis RELEASED duringlightreactionsby the spliting of watermolecules using theenergyobtain fromsunlight . Exceptcertain plantsperformingCrassulacenAcidMetabolism(CAM) all theotherplants/ trees do notrelease oxygenduringthe NIGHTTIME . In CAM palntsthe stomata are open aonlyduringnight, at thistime theyfix `CO_(2)`with the help of PEP andproduce oxaloaceticacidand release oxygen. EXample: Agave , Kalanchoseand OPunita.
Discussion
21480.

Question : A tree grows at the rate of 0.5m per year. What will be the height of the board fixed at 1.5m above the base five years ago?

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4.0m
3.5m
1.5m
4.5m

Answer :C
Discussion
21481.

Question : A tree grows at the rate of 0.5 m per year. What will be the height of board fixed at 1.5 m above the ground level five years ago?

Answer»

4M
3.5 m
1.5 m
4.5 m

Answer :C
Discussion
21482.

Question : A transverse section of the trunk of a tree shows concentric rings which are known as growth rings. How are these rings formed ? What is the significance of these rings?

Answer»

Solution :Concentric rings : Concentric rings are also called annular rings. These rings are PRODUCED due to secondary growth. In dicot tree secondary growth takes place due to meristematic tissue cambium.
In spring SEASON cambium is more active. So xylem cells PRODUCE wood of large size while in wood produced in winter have small sized and narrow xylary elements. As a result two rings are produced.

The age of a tree can be determined by counting the number of these rings. This branch of science is called DENDROCHRONOLOGY.
Discussion
21483.

Question : A transverse section of stem is stained first with safranin and then with fast green following the usual schedule of double staining for the preparation of a permanent slide. What would be the colour of the stained xylem and phloem ? (A) Red and green (B) Green and red (C) Orange and purple (D) Purple and orange

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RED and green
Green and red
Orange and yellow
Purple and orange

Solution :Red and green
Xylem TISSUE becomes red colour safranin and phloem tissue becomes green COLOURED due to last green. No other GIVEN by safranin and fast green.
Discussion
21484.

Question : A transverse section of the trunk of atree shows concentric rings which are known as growth rings . How are these ringsformed ? What are the significance of these rings ?

Answer»

Solution :Significance of growth rings :
1. Age of wood can be calculated
2. The quality of timber can be ascertained
3. Radio- CARBON dating can be VERIFIED
4. Past climate and archaeological dating can be made .
5. Provides evidence in FORENSIC investigation
Discussion
21485.

Question : A transverse section of a young dicot root can be distinguished from that of a young dicot stem by the presence of :

Answer»

A) radial arrangements of XYLEM and PHLOEM
B) interfascicular CAMBIUM
C) intrafascicular cambium
D) COLLATERAL arrangement of xylem and phloem

Solution :radial arrangements of xylem and phloem
Discussion
21486.

Question : A tracheid/vessel consists of row of cells placed one above the another.

Answer»


ANSWER :VESSEL
Discussion
21487.

Question : A touch on the right hand stimulates neurons in the

Answer»

left SOMATIC sensory AREA
left OCCIPITAL lobe
RIGHT somatic sensory area
right occipital lobe

Solution :NA
Discussion
21488.

Question : A tissue made up of only one type of differentiated cells is

Answer»

MERISTEM
Phloem
Xylem
Parenchyma

Answer :D
Discussion
21489.

Question : A tissue is a:

Answer»

group of separate organs that are coordinated in their activities
group of SIMILAR cells that FUNCTION together in a specialized ACTIVITY
layer of cells SURROUNDING an organ
solid structure formed of embryonic mesoderm

Solution : group of similar cells that function together in a specialized activity
Discussion
21490.

Question : A timber merchant bought 2 logs of wood from a forest & named A & B , The log A was 50 year old& B was 20 yearsold. Which log of wood will last longer for the merchant ? Why ?

Answer»

Solution :The wooden logof 50 yearsoldis DURABLE sincethe heart woodof the plantgetsharderandharderas thetimemoves, DUETO secondary GROWTH.
Discussion
21491.

Question :A thick-strand of underground hyphae resembling a root is known as …………

Answer»

SOLUTION :RHIZOMORPH
Discussion
21492.

Question : A thin, spirally coiled branch, very sensitive to contact is called ............

Answer»

SOLUTION :TENDRILS
Discussion
21493.

Question : (a) There are no flowers in banyan tree. Is it so 7 Comment on it. (b) Differentiate between phyllode and phylloclade. Give one example of each :

Answer»

Solution : (a) Banyan tree has hypanthodium inflorescence in which the RECEPTACLE becomes pear shaped and CONTAINS a hollow CENTRAL cavity and a hairy opening called OSTIOLE at their anterior side. The hollow cavity BEARS many male flowers a the ostiole side and female flowers at the basal side. Between male flowers and female flowers, gall flowers (steril female flowers) are also present.
Discussion
21494.

Question : (a) The equations given below represent the different stages of Nitrogen Cycle in plants. (i) 2NH_(3)^(+)+3O_(2)overset([A])rarr 2NO_(2)^(-)+2H^(+)+2H_(2)O (ii) 2NO_(2)^(-)+O_(2)overset([B])rarr 2NO_(3)^(-) (iii) underset("[Nitrate]")(NO_(3)^(-))overset([C])rarr underset("[Molecular Nitrogen]")(N_(2)) In the above equations [A], [B],[C] indicate the bacteria which is responsible for the reaction. Name them. (b) Define Denitrification. (c) Which enzyme is required for Nitrogen fixation ?

Answer»

Solution :(a) (i) A - Nitrosomonas
(ii) B - Nitrobacter
(iii) C- Pseudomonas
(b) Denitrification : NITRATES in the SOIL are converted back into atmospheric NITROGEN by a process called denitrification. Bacteria involved in this process are Pseudomonas, Thiobacillus and Bacillus subtilis.
`"Nitrate"overset("Pseudomonas")rarr "Molecular Nitrogen"`
(c) Enzyme REQUIRED for Nitrogen fixation : Nitrate Reductase, Nitrite Reductase
Discussion
21495.

Question : A: The bryophytes exist in two phases gametophyte and sporophyte. R : The sporophyte is nutritionally independent.

Answer»

A and R both are CORRECT and R is correct EXPLANATION of A. 
A and R are correct but R is not explanation of A. 
A is correct and R is FALSE. 
A and R are false. 

ANSWER :A
Discussion
21496.

Question : A : The absorption spectrum of chlorophyll 'a' shows close correlation with its action spectrum. R : Chlorophyll 'a' is present in both pigmen system I and II.

Answer»

A and R both are CORRECT and R is correct EXPLANATION of A.
A and R are correct but R is not explanation of A.
A is correct and R is FALSE.
A and R are false

Answer :A
Discussion
21497.

Question : A Test tube containing water, Ferricyanide and isolated chloroplasts was illuminated. A gas start evolving on the basis of their experiment. Answer the following questions. Explain the process (step) by which it is evolved?

Answer»

Solution :PROCESS is LIGHT reaction of photosynthesis. Photolysis of water OCCURS during non cyclic photophosphorylation of light reaction. Water is split and oxygen is released.
Discussion
21498.

Question : A Test tube containing water, Ferricyanide and isolated chloroplasts was illuminated. A gas start evolving on the basis of their experiment. Answer the following questions. In which light would the gas stop evolving and why?

Answer»

Solution :The EVOLUTION of gas will stop in green LIGHT because CHLOROPHYLL absorbs in other REGIONS of the spectrum but reflects green light.
Discussion
21499.

Question : A Test tube containing water, Ferricyanide and isolated chloroplasts was illuminated. A gas start evolving on the basis of their experiment. Answer the following questions. From which raw material is the gas evolved?

Answer»

SOLUTION :GAS is EVOLVED from WATER.
Discussion
21500.

Question : A terrestrial animal must be able to (a) conserve water(b) excrete large amount of salts in urine(c) excrete large amount of water(d) actively pump salts out through

Answer»

CONSERVE water
excrete LARGE AMOUNT of SALTS in urine
excrete large amount of water
actively PUMP salts out through
Discussion