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7801.

Question : What is pomology?

Answer»

SOLUTION :The branch of HORTICULTURE that DEALS with STUDY of fruits and practice of their cultivation is called pomology.
Discussion
7802.

Question : What is polyribosome?

Answer»

SOLUTION :ASSOCIATION of several RIBOSOMES on single mRNA molecule
Discussion
7803.

Question : What is polyembryony ?

Answer»

SOLUTION :It is the FORMATION of more than ONE EMBRYO in same SEED .
Discussion
7804.

Question : What is pleura? What is its function?

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Solution :The lungs are covered by double layered pleural membrane containing several LAYERS of elastie connective tissues and capillaries. It ENCLOSES the pleural fluid which REDUCES friction when the lungs EXPAND and contract.
Discussion
7805.

Question : What is plectostele ? Give example .

Answer»

Solution :1. Protostels -Stele in which phloem surrounds xylem.
2. PLECTOSTELE is a type of PROTOSTELE in which xylem plates alternate with phloem plates.
EG. LYCOPODIUM clavatum.
Discussion
7806.

Question : What is pleura ? Listits functions .

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SOLUTION :A PLEURA is a two -layered pertioneal sac AROUND the lungs and containsa pleural cavity filled with a water pleural fluid. Itallows free FIRCTIONLESS movementsof lunds , and protects the lungs from mechanical SHOCKS.
Discussion
7807.

Question : What is plasticity ? Give example.

Answer»

Solution :Plasticity refers to a phenomenon in which plants follows different pathways in response to environment or phases of life forming different kinds of STRUCTURES. e.g., Heterophylly in cotton, coriander and larkspur.
In such plants, the leaves of the juvenile plant are different in shape from those in MATURE plants.
On the other hand, difference in shapes of leaves produced in AIR and those produced in WATER in buttercup ALSO represent the heterophyllous development due to environment.
This phenomenon of heterophylly is an example of plasticity.
Discussion
7808.

Question : What is plectenchyma?

Answer»

Solution :The mycelium is organised into loosely or compactly INTERWOVEN fungal tissues called PLECTENCHYMA. It is further DIVIDED into two TYPES : prosenchyma and pseudoparenchyma.
Discussion
7809.

Question : What is plasticity?

Answer»

SOLUTION : Plants follow different pathways in response to environment or phases of life to form different KINDS of STRUCTURES. This ability is called plasticity. Example: Heterophylly in cotton and coriander. In such plants, the leaves of the juvenile plant are different in shape from those in MATURE plants. On the other hand, the difference in shapes of leaves produced in air and those produced in water in buttercup also represent the heterophyllous development due to the environment. This PHENOMENON of heterophylly is an example of plasticity
Discussion
7810.

Question : What is plasmodium ?

Answer»

Solution : A wall-less mass of multinucleated protoplasm ofslime MOULDS is KNOWN as PLASMODIUM.
Discussion
7811.

Question : What is plant morphology ?

Answer»

Solution :PLANT MORPHOLOGY also known as external morphology DEALS with the study of shape, size and structure of plants and their parts like (roots, stems, leaves, FLOWERS, FRUITS and seeds).
Discussion
7812.

Question : What is placentation ? Describe types of placentation .

Answer»

Solution :Ovary bears one or more ovules attached to a flattened cushion like placenta.
The arrangement of ovules within the ovary is called placentation.
The TYPES of placentation are as follow :
(i) Marginal Placentation : In marginal placentation the placenta forms a ridge along the ventral suture of the ovary and the ovules are borne on this ridge forming two rows e.g. pea, bean.
(ii) Axile Placentation : When the placenta is axial and the ovules are attached to it in a multilocular ovary, the placentaion is said to be axile. e.g. CHINA rose, tomato and lemon.
(III) Parietal Placentation : In parietal placentation, the ovules develop on the inner wall of the ovary or on peripheral part. Ovary is one-chambered but it becomes two chambered due to the formation of the false septum, ee MUSTARD and Argemone.
(iv) Free Central Placentation : When the ovules are borne on central axis and septa are absent ovary is one-chambered so it is called free central e.g. Dianthus and Primrose.
(v) Basal Placentation : In basal placentation, the placenta develops at the base of ovary and a single ovule is attached to it, e.g. Sunflower,Wheat.

Types of placentation : (a) Marginal (b) Axile (C) Parietal (d) Free central (e) Basal
Discussion
7813.

Question : What is planogametic copulation?

Answer»

Solution :Fusion of MOTILE GAMETE is CALLED planogametic copulation. Types - Isogamy, ANISOGAMY and OOGAMY.
Discussion
7814.

Question : Define pisciculture.

Answer»

Solution :CULTURING of FISHES is CALLED FISH CULTURE or pisciculture.
Discussion
7815.

Question : Whatis Phytol tail ? Mentoin its role .

Answer»

SOLUTION :a. Phytol TAIL is the lipophilic tail of chlorophyll MOLECULE.
B. It HELPS in anchoring the chlorophyll to lamellae
Discussion
7816.

Question : What is Phylogenetic tree?

Answer»

SOLUTION :A phylogenetic tree or evolutionary tree is a branching diagram or "tree" showing the INFERRED evolutionary relationships upon similarities and DIFFERENCES m their PHYSICAL or genetic characteristics.
Discussion
7817.

Question : What is meant by phylogenetic classification?

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SOLUTION :The classification of organisms BASED on evolutionary based on evolutionary and genetic relationship AMONG them is known as PHYLOGENETIC classification.
Discussion
7818.

Question : What is phyllotaxy? Name the type of phyllotaxy found in (i) Mustard (ii) Alstonia (iii) Calotropis.

Answer»

Solution :arrangement of LEAVES on the stem (i) MUSTARD - alternate (II) Alstonia - WHORLED (III) Calotropis - opposite
Discussion
7819.

Question : What is phyllotaxy ? Give its types with one example.

Answer»

Solution :The MODE of arrangement of leaves on the stem and its branches is called phyllotaxy. It is of four TYPES :
(i) Alternate or spiral (e.g., Mango) (ii) Opposite superposed (e.g., Jamun)(iii) Opposite decussate (e.g., CALOTROPIS)(iv) Whorled (e.g., Alstonia scholaris).
Discussion
7820.

Question :What is phyllotaxy ? Explain .

Answer»

Solution : Phyllotaxy is the pattern of arrangement of leaves on the stem or branch .
This is USUALLY of THREE type - alternate, opposite and WHORLED.

Alternate: In alternate type of phyllotaxy, a single leaf arises at each NODE in alternate e.g. chin rose, mustard and sunflower etc.
Opposite : In opposite type , a pair of leavs arise at each node and lie opposite to each other as in calotropis and Guava plants.
Whorled: If more than two leaves arise at a node and form a whorl, it is CALLED whorled.
Discussion
7821.

Question : What is photophosphorylation ?

Answer»

<P>

SOLUTION :Formation of ATP from ADP and `P_(i)` with the ENERGY of sunlight in the chloroplasts.
Discussion
7822.

Question : What is phenotypic plasticity ?

Answer»

Solution :Phenotypic plasicity is the ability of SINGLE genotype to produce more than ONE phenotype. When this plasticity is expressed seasonally in planktons, it is referred to as CYCLOMORPHOSIS.
Discussion
7823.

Question : What isPhelloderm?

Answer»

Solution :PHELLODERM(Secondary cortex)is a TISSUE resemblingcorticallivingparenchymaproducedcentripetally(inward)fromthe phellogenas a partof the peridermof STEMS and rootsin seed PLANTS .
Discussion
7824.

Question : What is phellogen?

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SOLUTION :ANOTHER NAME for cork-cambium.
Discussion
7825.

Question : What is phellem?

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SOLUTION :ANOTHER TERM for CORK.
Discussion
7826.

Question : What is perinuclear space?

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Solution :REFERS to space present between the TWO MEMBRANES of covering the nucleus.
Discussion
7827.

Question : What is periosteum ?

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SOLUTION :The external surface of the bone is COVERED by a double layered membrane CALLED periosteum.
Discussion
7828.

Question : What is perimysium?

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SOLUTION :The connective TISSUE COVERING around each FASCICLE is the PERIMYSIUM.
Discussion
7829.

Question : Whatis periderm? Mentionits components .

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SOLUTION :The PERIDERM is a protectivetissueof secondaryorigin REPLACES the epidermisand oftenprimarycortex .The peridermconsists of PHELLEM , PHELLOGEN , andphelloderm.
Discussion
7830.

Question : (a) What is peat ? How is it formed ? (b) What is its economic importance ?

Answer»

Solution :PEAT is dark brown semi DECOMPOSED and semi-fossilised MATTER found in acidic MARSHES .
Discussion
7831.

Question : What is Pasteur effect ?

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SOLUTION :The "PASTEUR effect" is the inhibiting effect of OXYGEN on the FERMENTATION PROCESS.
Discussion
7832.

Question : What is partial pressure of a gas?

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Solution :In a mixture of gases each GAST can conributes to the TOTAL pressure of the mixture. This CONTRIBUTION is the PARTIAL pressure. The partial pressure is the pressure of the gas if the gas were in the same VOLUME and temperature by itself.
Discussion
7833.

Question :What is Pars nervosa?

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SOLUTION :The neurohypophysis of the PITUITARY GLAND is known as PARS NERVOSA.
Discussion
7834.

Question : What is palmate leaf?

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Solution :PALMATE leaf is a leaf bearing number of PRINCIPAL VEINS, if simple and all leaflets attached DIRECTLY to the tip of PETIOLE, if compound.
Discussion
7835.

Question : What is paleontology ?

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SOLUTION :It is the STUDY of PREHISTORIC LIFE through FOSSILS.
Discussion
7836.

Question : What is pacemaker?

Answer»

Instrument measuring Heartbeats
Instrument measuring big arteries
ATRIO - ventricular NODE, which PROVIDES STIMULATION for heart BEATING
Artificial sinuauricular node, which provides stimulation for heart beating

Solution :Artificial sinuauricular node, which provides stimulation for heart beating
Discussion
7837.

Question : What is oxidative decarboxylation ? What happens to pyruvate immediately after this reaction ? Name the enzyme involved in this reaction.

Answer»

Solution :(i)OXIDATIVE decarboxylation involves the loss of TWO hydrogen atoms (dehydrogenation) and loss of `CO_(2)` MOLECULE from a compound.
(ii)In cell respiration, pyruvate undergoes oxidative decarboxylation in the PRESENCE of enzyme pyruvate dehydrogenase COMPLEX and co-enzyme - A and changes into 2-carbon compound acetyl Co -A.
Discussion
7838.

Question : What is Out crossing?

Answer»

Solution :Out crossing: It is the breeding between UNRELATED animals of the same breed but having no COMMON ancestry. The offspring of such a cross is CALLED outcross. This METHOD is suitable for breeding animals below average in productivity.
Discussion
7839.

Question : What is osmosis.? Name one experiment by which it can be demonstrated.

Answer»

Solution : It is transport of water or any other SOLVENT from lower concentration to HIGHER concentration through a semipermeable MEMBRANE without the expenditure of ENERGY. Osmosis can be demonstrated by potato osmoscope.
Discussion
7840.

Question : What is meant by osmotic regulation?

Answer»

Solution :Osmotic REGULATION is the CONTROL of tissue osmotic pressure which ACTS as a DRIVING force for movement of water across BIOLOGICAL membranes.
Discussion
7841.

Question : What is open reading frame?

Answer»

Solution :One of the ALTERNATIVE WAYS of dividing up a sequence of bases in DNA or RNA into CODON is called reading frame. Any sequence of DNA or RNA, beginning with a start codon and which can be TRANSLATED into a protein is known as an open reading frame (ORF).
Discussion
7842.

Question : What is one of the major cause of Emphysema?

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SOLUTION :CIGARETTE SMOKING.
Discussion
7843.

Question : What is oligopotency ?

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SOLUTION :(i) Oligopotency REFERS to stem cells that can differentiate into few CELL TYPES.
(ii) For example lymphoid or myeloid stem cells can differentiate into B and T cells but not RBC.
Discussion
7844.

Question : What is obesity?

Answer»

SOLUTION : It is caused due to the storage of excess of body fat in adipose TISSUE. It may induce HYPERTENSION, ATHEROSCLEROTIC heart DISEASE and diabetes. Obesity may be genetic or due to excess intake of food, endocrine and mctabolic disorders.
Discussion
7845.

Question : What is nuptical flight?

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Solution :During the breeding season in WINTER, a unique flight taken by the queen BEE followed by several drones is CALLED NUPTIAL flight.
Discussion
7846.

Question :Define Numerical Taxonomy

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SOLUTION :It is the quantitative assement of characters in organisms . The RELATIONSHIP of organisms is NUMERICALLY DETERMINED usually with the help of computer.
Discussion
7847.

Question : What is numerical taxonomy?

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SOLUTION :The evaluationof resemblancesand DIFFERENCES of organismsthroughstatisticalmethodsfollowedbycomputeranalysis to establishthe numericaldegreeof relationshipamongthemis KNOWAS NUMERICAL TAXONOMY
Discussion
7848.

Question :What is number of spinal nerves in frog?

Answer»

8 PAIRS
10 Pairs
11 Pairs
12 Pairs

Answer :B
Discussion
7849.

Question : What is NPK fertiliser?

Answer»

SOLUTION :NITROGEN, PHOSPHORUS, POTASSIUM FERTILISER.
Discussion
7850.

Question : What is normal blood glucose level in human beings ?

Answer»

SOLUTION :NORMAL blood glucose level :
`{:("Preprandial : ",70-110 mg//dl),(,"(Before food) - (FASTING)"),("POSTPRANDIAL : ",110-140 mg//dl),(,"(After food)"):}`
Discussion