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7651.

Question : What is the effect of gibberelins on buds ?

Answer»


ANSWER :BREAK the BUD DORMANCY.
Discussion
7652.

Question : What is the effect of GnRH produced by hypothalamus?

Answer»

Stimulates the synthesis and secretionof androgens
Stimulartes secretion of milk in MAMMARY glands
Stimulartes fetal ejection reflex.
Stimulates synthesis of CARBOHYDRATES from non=carbohydrates in liver

Solution :GONADOTROPIN releasing hormone (GnRH), stimulates the ANTERIOR lobe of pituitary gland (adenohypophysis) to secrete two gonadotropins, FSH and LH. In males LH stimulates the Leydig's cell of the TESTIS to secrete androgens.
Discussion
7653.

Question : What is the effect of ethyelen on fruits?

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ANSWER :It INDUCES FRUITS RIPENING
Discussion
7654.

Question : What is the effect of aldosterone on kidneys and where is it produced?

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Solution :1. Excessive stretch of cardiac atrial cells cause an increase in blood flow to the ATRIA of the heart and release Atrial Natriuretic Peptide or factor (ANF) travels to the kidney where it increases NA* excretion and increases the blood flow to the glomerulus, acting on the afferent GLOMERULAR arterioles as a VASODILATOR or on efferent arterioles as a vasoconstrictor.
2.It decreases aldosterone release from the adrenal cortex and also decreases release of renin, thereby decreasing angiotensin II.
3.ANF ACTS antagonistically to the renin angiotensin system, aldosterone and vasopressin.
Discussion
7655.

Question : What is the effect of accumulation ofK^(+) ions in guard cells ?

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Solution :Accumulation of `K^(+)` ions increases.soluteconcentration in the guard cells and this results in endosmosis RESULTING inturgidity, HENCE OPENING of STOMATA.
Discussion
7656.

Question :What is the edible part of coconut fruit

Answer»

Mesocarp and EPICARP
Endocarp and Endosperm
Endosperm
Epicarp, Endosperm 

ANSWER :C
Discussion
7657.

Question : What is the edible part in apple fruit ?

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SOLUTION :THALAMUS
Discussion
7658.

Question : What is the disadvantage of photores piration?

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SOLUTION :WASTEFUL LOSS of NADPH, and ATP
Discussion
7659.

Question : What is the difference in simple and complex tissues? Give examples in each category?

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Solution :Simple tissues are made up of ONE type of cells while complex tissues are made up of several cells. PARENCHYMA, COLLENCHYMA and sclerenchyma are simple tissues while XYLEM and PHLOEM and comlex tissues.
Discussion
7660.

Question : What is the difference between the matrix of bones and cartilage?

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SOLUTION : In the matrix of bones OSSEIN BONE forming substance is present. At the same time `CA^(++)` IONS are also present.
Discussion
7661.

Question : What is the difference between the nuclei of prokaryoticand eukaryotic cells?

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SOLUTION : In eukaryotic cell, the NUCLEUS has a DISTINCT nuclear envelope, WHEREAS the prokaryotic cell lacks amembrane bound nucleus.
Discussion
7662.

Question : What is the difference between RNA and DNA in terms of nitrogenous base ?

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SOLUTION :RNA has URACIL INSTEAD of THYMINE.
Discussion
7663.

Question : What is the difference between nephron present in reptiles and mammals?

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Solution :Reptiles have REDUCED GLOMERULUS or lack glomerulus and HENLE's LOOP. Mammals have a long Henle's loop. Reptiles PRODUCE hypotonic urine whereas mammals produce hypertonic urine.
Discussion
7664.

Question : What is the difference between lymph and blood?

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SOLUTION :
Discussion
7665.

Question : What is the difference between lymph and blood ?

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Solution :Lymph is a COLOURLESS FLUID containing specialized lymphocytes seen inintercellular space. Its composition is same as plasma but it contains less amount of blood proteins, RBCs and fat globules.
It is a medium of exchange of substances between cells and blood capillaries.
Plasma is a viscous fliuid flowing in CLOSED ducts. It contains large amount of blood cells, blood protein, NUTRIENTS, HORMONES and enzymes.
Discussion
7666.

Question : What is the difference between lenticels and stomata ?

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SOLUTION :
Discussion
7667.

Question : What is the difference between flora, fauna and vegetation? Eichhorina crassipes is called as an exotic species while Rauwolfia Serpentine is an endemic species in India. What do these terms exotic and endemic refer to?

Answer»

SOLUTION :
The TERM exotic and endemic refers to :
Endemic species : A species which is found only in a particular geographical area is called the endemic species for that area. For EXAMPLE, Rauwolfia serpentina is found only in INDIA. So it is an endemic species in India.
Exotic Species : A species which is not naturally found in a particular area but MAY be living because of being imported is called an exotic species. For example, Eichhornia crassipes is native of other country but it was introduced in India. So it is an exotic species in India.
Discussion
7668.

Question : What is the difference between electrical transmission and chemical transmission ?

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SOLUTION :(a) Electrical transmission : Synaptic cleft may or may not be present. Electrical current from one neuron passes through synapse without BREAK to successive neuron.
(b) Chemical transmission : Synaptic cleft is present. NEUROTRANSMITTER conducted from pre-synaptic NEURONS to post-synaptic neuron. Chemical transmission is SLOW.
Discussion
7669.

Question : What is the difference between direct and indirect development?

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SOLUTION :DEVELOPMENT of the fertilized egg which INCLUDES larval stages is called INDIRECT development and without larval stage is called direct development
Discussion
7670.

Question : What is the difference between cutaneous and pulmonary respiration ?

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SOLUTION :Two types of respiration takes PLACE in frog e.g. by skin and by lungs. Cutaneous respiration : It is DONE by wet skin with lots of blood capillaries. Pulmonary respiration : It is done by lungs and it is done OUTSIDE WATER.
Discussion
7671.

Question : What is the difference between compound eyes and simple eyes?

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Solution :In SIMPLE eyes' a single lens collects and focuses light ONTO the retina of the eye.
2. In CASE of compound eyes, multiple lenses are involved. Each of them focuses the light onto a small number of retinula cells.
3. All the cells must coordinate to help the animal visualise the object.
4. The vision is thus decribed as mosaic vision.
Discussion
7672.

Question : What is the difference between a zoospore and an aplanospore?

Answer»

SOLUTION :ZOOSPORE is a MOTILE SPORANGIOSPORE, whereas aplanospore is a non-motile sporangiospore.
Discussion
7673.

Question : What is the difference between a Zoa and wild life sanctuary?

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SOLUTION :
Discussion
7674.

Question : What is the dead wood present in the centre of a tree known as?

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SOLUTION :HEART WOOD of DURAMEN.
Discussion
7675.

Question : What is the correct to say about the hormone action in humans?

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Glucagon is secreted by `beta-`cells of islets of Langerhans and stimulated glycogenolysis.
Secretion of thymosin is stimulated with aging.
In females, FSH first binds with specific receptors on ovarian cell membrane.
FSH stimulates the secretion of ANDROGENS.

Solution :MECHANISM of hormone action is not the same in all categories of hormones. These hormones bind with the specific receptors located in their target tissues. Hormone receptor is of TWO types: membrane bound receptor and intracelular receptor. FSH is a proteinaceous hormone, has large molecular WEIGHT and is insoluble in LIPIDS, therefore, it cannot enter the target cell . Thus, it binds with the membrane bound receptor present on ovarian cell membrane
Discussion
7676.

Question : What is the control centre of a cell ?

Answer»

SOLUTION :NUCLEUS.
Discussion
7677.

Question : Briefly give an account of the contribution of Prof. Birbal Sahni.

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Solution :1. He is the FATHER of Indian Palaeobotany.
2. He described Fossils plants from Rajmahal Hills of Eastern BIHAR .
3. He described many form GENERA.
Eg: Pentoxylon SAHNI, Nipanioxylon.
Discussion
7678.

Question : What is the contribution of fungi in a mycorrhiza?

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SOLUTION :To ABSORB, NITROGEN and other MICELLES from the SOIL.
Discussion
7679.

Question : What is the composition of pearl?

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Solution :Composition of pearl
Pearl comprises of water, ORGANIC matter, calcium CARBONATE and the RESIDUE. (1) Water: 2-4%, (2) Organic matter: 3.5-5.9%, (3) Calcium carbonate: 90% and (4) Residue: 0.1-0.8% carbonate: 90%.
Discussion
7680.

Question : What is the composition of cell wall in prokaryotic cell and eukaryotic plant cell ?

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Solution :In prokaryotes, cell wall CONSISTS of peptidoglycan that contains POLYMERS of modified sugars (N-Acetyl GLUCOSAMINE and N-acetyl muramic acid ) crosslinked with short peptides.
In eukaryotic plant cell, cell wall is chiefly composed of insoluble POLYSACCHARIDE, cellulose. Certain other compounds such as hemicellulose, pectin and proteins ALSO occur in the cell wall.
Discussion
7681.

Question : What is the commercial source of cork? How is it formed in the plant?

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Solution :Commercially cork is obtained from cork cambium of PLANT. The cork of bottle is MADE from it. Cork is made from cells of cork the cambium. The cells of cork cambium cut the cells from inside and outside periclinally. The cells which are cut outside become suberised and die.
They are radially arranged in rows without of intercellular spaces and arranged properly. That creates phellem. Phloem is impermeable for WATER due to suberin and protects following tissues.
Discussion
7682.

Question : What is the chemical reaction that is affected in people suffering from Albinism?

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Solution :
Affected individuals lack the TYROSINASE enzyme which CONVERTS DOPA to MELANIN pigment RESPONSIBLE for skin colour. It is caused DUE to autosomal recessive genes.
Discussion
7683.

Question : What is the chromosome number in calyptra, perichaetial cells, columella and protonema if endothecium cell contains 20 chromosomes?

Answer»

10, 10, 20, and 10, RESPECTIVELY
10, 20, 20, and 10, respectively
20, 10, 20, and 10, respectively
10, 10, 20, and 10, respectively

ANSWER :A
Discussion
7684.

Question : What is the chemical nature of plasma membrane of a eukaryotic cell?

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SOLUTION : Lipoproteinous and trilaminar
Discussion
7685.

Question : What is the chemical composition of xylem and phloem sap ?

Answer»

Solution :Xylem solution mainly possesses water and some mineral nutrients.
PHLOEM solution mainly possesses SUCROSE that is disaccharide. Hormones and AMINO acids are SEEN in phloem sap.
Discussion
7686.

Question : What is the cause of Addison's disesase ?

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SOLUTION :Underactivity of adernal CORTEX
Discussion
7687.

Question : What is the characteristic anatomical feature of C4plants, known as?

Answer»

SOLUTION :KRANZ ANATOMY.
Discussion
7688.

Question : What is the cell wall composition of the following organism? (a) Fungi (b) Bacteria (c) Algae.

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SOLUTION :FUNGI- CHITIN and fungal cellulose
(B) Bacteria - Peptidoglycan
(C ) Algae- Cellulose. Mannan and galactan
Discussion
7689.

Question : What is the cause of osteoporoses?

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Solution :Due to DECREASE in bone DENSITY, reduction in sex HORMONES, lack of CALCIUM in bone, less estrogen level.
Discussion
7690.

Question : What is the body form of fungi called?

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SOLUTION :MYCELIUM.
Discussion
7691.

Question : What is the basis of the earliest systems of classification ?

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USED only gross superficial CHARACTERS 
Based MAINLY on VEGETATIVE characters 
Systems was artificial 
All of these 

Answer :D
Discussion
7692.

Question : What is the basis of classification of algae?

Answer»

SOLUTION :The CLASSIFICATION of ALGAE is primarily based on the type of pigments possessed and the type of stored food.
Discussion
7693.

Question : What is the basis of classification of algae ?

Answer»

Solution :Algae are classified based on PIGMENTS `&` colour of the THALLUS.
a. Chlorophyceae : Greenalgae DUE to the presence of the pigments chlorophyll a and b.
b. Phaeophycea : Brown algae due to the presence of the pigments chlorophyll a and c and FUCOXANTHIN a and d.
c. RHODOPHYCEAE : Red algae due to the presence of phycoerythrin (red colour) and chlorophyll and d.
Discussion
7694.

Question : What is the basis for designating C_(3) and C_(4) pathways of photosynthesis ?

Answer»

SOLUTION :
Discussion
7695.

Question : What is the basis for the difference in the synthesis of the leading and lagging strand of DNA molecules?

Answer»

Origin of replication OCCURS only at the 5' end of the molecules.
DNA ligase works only in the 3' `to`5' DIRECTION
DNA polymerase can JOIN new nucleotides only to the 3' end of the growing stand.
Helicases and single-strand BINDING proteins that work at the 5' end.

Answer :c
Discussion
7696.

Question : What is the basic structural unit of chitin?

Answer»

SOLUTION :N-acetyl GLUCOSAMINE
Discussion
7697.

Question : What is the basic unit of taxonomy ?

Answer»

SOLUTION :SPECIES.
Discussion
7698.

Question : What is the baiss for the tolipotency of cells ?

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SOLUTION :Presence of FULL genetic INFORMATION (all the GENES) in each cells.
Discussion
7699.

Question : What is the basic function that cytokinin performs ?

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SOLUTION :PROMOTE CELL DIVISION or CYTOKINESIS.
Discussion
7700.

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

Answer»

SOLUTION :APPROX. 24 HRS.
Discussion