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7701.

Question : What is the average cell cycle span for a mammalian cell ?

Answer»

SOLUTION :The average cell cycle SPAN of MAMMALIAN cell is 24 HOURS.
Discussion
7702.

Question : What is the association between the roots of Pinus with fungi called as?

Answer»

SOLUTION :MYCORRHIZA.
Discussion
7703.

Question : What is the anterior pair of wings called in cockroach ?

Answer»

STERNUM
Elytra
TERGUM
CERCI

SOLUTION :Elytra
Discussion
7704.

Question : What is the arrangement in central lipid layer?

Answer»

Solution :PHOSPHOLIPIDS in 2 LAYERS are ARRANGED in way that their polar ends are outside and non-polar ends are in the interior.
Discussion
7705.

Question : What is the arrangement in the basal body?

Answer»

SOLUTION :9 + 0 arrangement 9 microtubule triplets in periphery and none in the CENTRE.
Discussion
7706.

Question :What is the ANS controlling centre? Name the parts that are supplied by the ANS.

Answer»

SOLUTION :Hypothalamus is the ANS CONTROLLING centre. The AUTONOMIC neural system innervates smooth muscles, GLANDS and cardiac MUSCLE.
Discussion
7707.

Question : What is the amount of average price tag on nature's life support services determined by Robert Constanza and his colleagues?

Answer»

US $ 3 trillion a year
US $ 13 trillion a year
US $ 23 trillion a year
US $ 33 trillion a year

Answer :D
Discussion
7708.

Question : What is the amount of O_(2) supplied to tissues through every 100 ml. of oxygenated blood under normal physiological conditions?

Answer»

SOLUTION : Every 100 ML of oxygenated BLOOD can delive around 5 mL of`O_(2)` to the tissue under normal physiotogical conditions.
Discussion
7709.

Question : Whatis the amount of airof tidal volumeand alveolar volume in a normal person?

Answer»

SOLUTION :TIDAL volume = 500 mlAlveolar air = 350 ml.
Discussion
7710.

Question : What is the aim of Kuhne's experiment ?

Answer»

Solution :Kuhne's fermentation TUBE EXPERIMENT demonstrates the process of ALCOHOLIC fermentation.
Discussion
7711.

Question : What is the alternative name of consumer decomposer protists' ?

Answer»

SOLUTION : SLIME MOULDS.
Discussion
7712.

Question : What is the advantage of phospholipid bilayer's fluidity ?

Answer»

Solution :Fluidity of phospholipid bilayer ALLOWS the MEMBRANE to stretch under stress and to reseal if DISRUPTED, and PERMITS lipid and protein molecules to move sideways.
Discussion
7713.

Question : What is the advantage of lignocellulose in wall of xylem ?

Answer»

SOLUTION :Lignocellulose PROVIDES RIGIDITY, THICKNESS and resistance.
Discussion
7714.

Question : What is the advantage of having more than one pigment molecule in photocentre?

Answer»

Solution :The advantages of more than one molecule in PHOTOCENTRE are :1. Photosystem I and photosystem II form the ASSIMILATORY power.
2. Pigments absorb light energy and transfer it to CHLOROPHYLL for use in photosynthesis.
3. The pigments protect the chlorophyll molecule from photo oxidation.
Discussion
7715.

Question : What is the advantage of completely separated circuits in circulation?

Answer»

Solution :COMPLETELY separated circuits have an important advantage. DIFFERENT pressures are MAINTAINED in the pulmonary and SYSTEMIC circulation.
Discussion
7716.

Question : What is the action spectrum of transpiration?(a) Blue and infra red(b) Green and ultraviolet(c) Orange and red(d) Blue and red

Answer»

BLUE and INFRA red
Green and ultraviolet
Orange and red
Blue and red

Answer :D
Discussion
7717.

Question : What is the action of ADH at collecting duct?

Answer»

Solution :To absorb WATER THUS MAKING uring hypertonic.
Discussion
7718.

Question : What is the role of national gardens in conserving biodiversity-Discuss.

Answer»

Solution :1.Gardens with aesthetic value which attract a large number of visitors. EG: The Great Banyan Tree (Ficus bengalensis) in the Indian Botanical Graden at Kolkata.
2. Gardens have a wide RANGE of species and supply taxonomic meterial for botanical research.
3. Garden is used for self - instruction or demonstration purposes.1.Gardens with aesthetic value which attract a large number of visitors. Eg: The Great Banyan Tree (Ficus bengalensis) in the Indian Botanical Garden at Kolkata.
2. Gardens have a wide range of species and supply taxonomic meterial for botanical research.
3. Garden is used for self - instruction or demonstration purposes. 4. It can integrate information of diverse fields like ANATOMY, Embryology,Phytochemistry,Cytology,Phsiology and Ecology. 5. Act as a conservation centre for diversity ,rare and ENDANGERED species. 6. It offers annual list of available species and a free EXCHANGE of seeds . 7. Botanical garden gives information about method of propagation , sale of plant meterial to the general public.
Discussion
7719.

Question : What is tendon?

Answer»

Solution :SKELETAL muscle is attached to the bone by a bundle of COLLAGEN fibres KNOWN as TENDON.
Discussion
7720.

Question : What is synthesized during G_2- phase ?

Answer»

PROTEIN
MICROTUBULES
RNA
a and B

ANSWER :D
Discussion
7721.

Question :What is Synaptic Cleft?

Answer»

SOLUTION :A small GAP between the PRE and post synaptic membranes is called Synaptic Cleft. It FORMS a structural gap and a functional bridge between neurons.
Discussion
7722.

Question : What is synapse ? How many types of synapses are found ? Discuss conduction of nerve impulse through synapse with diagram.

Answer»

SOLUTION :A NERVE impulse is transmitted from one neuron to ANOTHER through junctions called Synapses. Conduction of never impulses pass through synapse.
A synapse is formed by the MEMBRANES of a pre-synaptic neuron and a post-synaptic neuron, which may or may not be separated by a gap called synaptic cleft.
There are two types of synapses :
(i) Electrical synapses
(II) Chemical synapses
(i) Electrical Synapses :
The membranes of pre and post-synaptic neurons are in very close proximity.
Electrical current can flow directly from one neuron into the other across these synapses.
Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon.
Impulse transmission across an electrical synapse is always faster than that across a chemical synapse.
Electrical synapses are rare in our system.
Chemical Synapses :
The membranes of the pre and post-synaptic neurons are separated by a fluid filled space called synaptic cleft.
The pre synaptic neuron transmit an impulse across the synaptic cleft to the post synaptic neuron.

Chemicals called neurotransmitters are involved in the transmission of impulses at these synapses.
The axon terminals contain vesicles filled with these neurotransmitters.
When an impulse arrives at the axon terminal it stimulates the movement of the synaptic vesicles towards the membrane where they fuse with the plasma membrane and release their neurotransmitters in the synaptic cleft.
The released neurotransmitters bind to their specific receptors, present on the postsynaptic membrane. This binding opens ion channels allowing the entry of ions which can generate a new potential in the post-synaptic neuron.
The new potential developed may be either excitatory or inhibitory.
Discussion
7723.

Question : What is a Synapse?

Answer»

Solution :The junction between TWO neurons is called a SYNAPSE through which a NERVE impulse is TRANSMITTED
Discussion
7724.

Question : What is swarming in lac culture?

Answer»

Solution :he MASS emergence of larvae from the EGG in SEARCH of a host PLANT is called 'swarming'.
Discussion
7725.

Question : What is symplast pathway?

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Solution :When WATER FLOWS from one CELL to anotherthrough inter connected cytoplasmicstrands CALLED plasmodesmata.
Discussion
7726.

Question : What is Svedberg units ?

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Solution :SVEDBERG UNIT is a MEASURE of a particle SIZE dependent on the speed with which particle sediment in the ultracentrifuge.
Discussion
7727.

Question : What is subdural space?

Answer»

SOLUTION :The space between the DURAMATER and ARACHNOID mater is CALLED subdural space.
Discussion
7728.

Question : What is substrate level phosphorylation?

Answer»

Solution :Direct TRANSFER of phosphate MOIETY from substrate MOLECULE to ADP and is converted into ATP is called substrate PHOSPHORYLATION or direct phosphorylation or trans-phosphorylation.
Discussion
7729.

Question : What is subarachnoid space?

Answer»

SOLUTION :The SPACE between the PIAMATER and ARACHNOID mater is called subarachnoid space.
Discussion
7730.

Question : What is Stramonium?

Answer»

Solution :STRAMONIUM is a drug obtained from the LEAVES and roots of Datura stramonium and USED to TREAT asthma and whooping cough.
Discussion
7731.

Question : What is stomatal apparatus ? Explain the structure of stomata with a labelled diagram.

Answer»

SOLUTION :Stomatal PORE, guard cells ACCESSORY cells AROUND them collectively FORM stomatal apparatus.
Discussion
7732.

Question : What is stomatal apparatus? Explain the structure of stomata with a labelled diagram.

Answer»

Solution :The stomatal aperture, GUARD cells and the SURROUNDING SUBSIDIARY cells are TOGETHER called stomatalapparatus.
Discussion
7733.

Question :What is stem ? Describe parts of stem and normal functions.

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Solution :The stem is the ascending part of the axis bearing branches , leaves , flowers and FRUITS. It develops from the plumule of the embryo of a germinating seed . They BEAR nodes and internodes.
The region of the stem where leaves are born is called node while internodes are the portion between two noeds. The stem bears buds, which may be terminal or axillary.
Stem is generally green when young and later often become woody and dark brown.
Main functions of the stem : (i) Spreading out branches bearing leaves, flowers and fruits.
(ii) It conducts water, minerals and photosynthates.
(iii) Some STEMS perform the FUNCTION of storage of food, SUPPORT, protection and of vegetative propagation.
Discussion
7734.

Question : What is sternum?

Answer»

Solution :Sternum is a FLAT bone on the mid ventral LINE of the THORAX. It provides space for the attachment of the thoracic ribs and abdominal muscles.
Discussion
7735.

Question : What is stifling?

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SOLUTION :The process of KILLING the cocoons is called STIFLING.
Discussion
7736.

Question : What is special about tissue present in the heart ?

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SOLUTION :Characteristics of cardiac muscle tissue of special tissue located in heart are as under : (1) Cardiac muscle fibres are available to CENTRAL and Autonomous both neural systems and they do not depend on their WISH power. (2) These muscles are resistant and show rhythmicity. (3) They have full supply of blood. (4) If they are completly removed then also it POSSESSES the property of contraction, EG. they are myogenic (It possesses both properties of muscle and nerve). So heart is known as mayogenic.
Discussion
7737.

Question : What is special about meristematic tissues?

Answer»

Solution :These are UNDIFFERENTIATED cells, capable of DIVIDING and can FORM all other TYPES of cells.
Discussion
7738.

Question : What is spathe?

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Solution :In spadix, ENTIRE inflorescence is covered by a BRIGHTLY COLOURED or HARD bract called a SPATHE.
Discussion
7739.

Question : What is skeletal system ? Explain.

Answer»

Solution :Hard, supporting and protective component of ANIMAL BODY form skeleton system.
Study of skeletal system is Osteology. Skeletal system is formed of bones and few cartilages.
It has a significant role in MOVEMENT shown by the body.
Bone and cartilage are special type of CONNECTIVE tissue.
The former has a very hard matrix due to calcium salts in it and the latter has slightly pliable matrix dur to chondroitin salts.
In human beings, this system is MADE up of 206 bones and a few cartilgaes. It is grouped into two principal divisions - (i) the axial and (ii) the appendicular skeleton.
Discussion
7740.

Question : What is site of counter-current mechanism in the nephron?

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SOLUTION :LOOP of HENLE of NEPHRON.
Discussion
7741.

Question :What issilicosis ?In whichwayaffects the respiratorysystem ?

Answer»

SOLUTION : Silicosisis anoccupationaldisease whichoccursdue tocontinuous EXPOSURE of PERSONS tosilicadust .
As ARESULT of chromicexposure.Fibrosis ofupperpart oflungoccurscausinginflammation.
Discussion
7742.

Question : What is significamce of respiratory pigment present in the blood?

Answer»

Solution :RESPIRATORY PIGMENT (e.g. H aemoglobin) increases the `O2^(-)` carrying CAPACITY of the blood.
Discussion
7743.

Question : What is Sex-switch gene?

Answer»

Solution :(i) A gene, sex-lethal (SxL) LOCATED on the X chromosome, in Drosophila DIRECTS female DEVELOPMENT.
(ii) This gene has two states of ACTIVITY. When it is 'on' it directs female development and when it is 'off' maleness ensures.
(iii) Other genes located on the X chromosome and autosomes regulates sex switch gene.
(iv) However, the Y chromosome of Drosophila is required for MALE fertility.
Discussion
7744.

Question : What is serum?

Answer»

Solution :BLOOD PLASMA MINUS the CLOTTING PROTEINS.
Discussion
7745.

Question : What is septum pellucidum?

Answer»

Solution :A thin MEMBRANE which SEPARATES the LATERAL VENTRICLES I and II is called the septum pellucidum.
Discussion
7746.

Question : What is seed? Describe structure of dicotyledonous and monocotyledonous seed with diagram.

Answer»

Solution : Seed : The ovules after fertilisation develop into seeds.
A seed is made up of a seed coat and an embryo.
The embryo is made up of a radicle, an embryonal axis and one (as in wheat, maize) or two cotyledons (as in gram and pea).
(a) Structure of a Dicotyledonous seed :
The outermost covering of a seed is the seed coat.
The seed coat has two layers, the outer tcsta and the inner tegmen.
The hilum is a scar on the seed coat through which the developing seeds were attached to the fruit.
Above the hilum is a small pore called the micropyle.
Within the seed, coat is the embryo, consisting of an embryonal axis and two cotyledons.The cotyledons are often fleshy and full of reserve food materials.
At the two ends of the embryonal axis are PRESENT the radicle and the plumule.

In some seeds such as castor the endosperm formed as a result of double fertilisation, is a food storing tissue.
In plants such as bean, gram and pea, the endosperm is not present in mature seeds and such seeds are called non-endospermous.
(b) Structure of MONOCOTYLEDONOUS seed : Generally, monocotyledonous seeds are endospermic but some as in orchids are non endospermic.
In the seeds of cereals such as maize the seed coat is membranous and generally fused with the fruit wall.
The endosperm is bulky and stores food. The outer most is hard.
The outer covering of endosperm separates the embryo by a proteinous layer called ALEURONE layer. It is made up of EITHER square or RECTANGLE cells. Protein granules are stored in its cells. It encloses endosperm.
The embryo is small and situated in a groove at one end of the endosperm. It consists of one large and shield shaped cotyledon known as scutellum and a short axis with a plumule and a radicle.
The plumule and radicle are enclosed in sheaths which are called coleoptile and coleorhiza respectively.
Discussion
7747.

Question : What is seed lac?

Answer»

SOLUTION :Lac cut from the HOST plant is called 'stick lac'. The lac present on the twig is SCRAPED and collected. After grinding, the unnecessary MATERIALS like DUSTS and fine particles are removed. The resultant lac is called 'seed lac'.
Discussion
7748.

Question : What is sclerotium?

Answer»

Solution :Sclerotium is COMPACT HYPHAL MASS SURROUNDED by THICK covering which is meant for overcoming unfavourableconditions.
Discussion
7749.

Question : What is Scientific name ? Describe.

Answer»

Solution :In ORDER to facilitate the study, number of scientists have established procedures to assign a scientific name to each known organism.
This is ACCEPTABLE to biologists all over the world.
For PLANTS scientific names are based on agreed principles and criteria, which are provided in International Code for Botanical Nomenclature (ICBN).
Animal TAXONOMISTS have EVOLVED International Code of Zoological Nomenclature [ICZN].
The scientific names ensure that each organism has only one name.
Description of any organism should enable the people [in any part of the world] to arrive at the same name.
They also ensure that such name has not been used for any other known organism.
Discussion
7750.

Question : What is sarcoplasmic reticulum?

Answer»

Solution :A network of SER present in SARCOPLASM of MUSCLE FIBRE
Discussion