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7901.

Question : What is meant by secondary growth? Which are its type ?

Answer»

Solution :Primary Growth : With the help of lateral meristematic TISSUE, length of root and STEM grows. It is CALLED primary growth.
Secondary Growth: After completion of primary growth, mainly dicot plants thicken. This increase in thick thickening is called secondary growth.
TYPES of secondary growth : Two types of lateral meristem take part in secondary growth. Vascular CAMBIUM and cork cambium.
Discussion
7902.

Question : What is meant by physiotherapy?

Answer»

Solution :1. Physiotherapy is the therapeutic EXERCISE tomake the limbswork near normally.
2. It is a rehabilitation profession with a presence in all health CARE centres.
3. Therapeutic exercises are carried out by physiotherapists.
4. The common PROBLEM at the end of FRACTURE treatment is the wasting of muscles and stiffness of joints.
5. These problems can be restored by the physiotherapy with gradual exercises.
6. It has proven to be effective in the post surgery treatment and management of arthritis, spondylosis, musculo skeletal disorders, stroke and spinal cord injury.
Discussion
7903.

Question : What is meant by permanent tissue ? Give its types.

Answer»

Solution :Followingdivisions of cells in both primary and as well as secondary meristems, the newly formed cells become structurally and functionally speciallsed and lose ability to divide. Such cells are termed permanenet or mature cells and constitute the permanent tissues.
There are two permanent tissues: (A) Simple TIssues (B) Complex Tissues.
(A) Simple Tissues : The cells of the permanent tissues do not generally divide further. Permanent tissues. There are 3 types of simple tissues : (a) Parenchyma (b) Collenchyma (c) Sclerenchyma.
(a) Parenchyma Tissues : Parenchyma FORMS the major component within organs.

The cells of the parenchyma are generally isodiametric.
They may be spherical, oval, round, polygonal or elongated in shape.
Their walls are thin and made up of cellulose.
They may either be closely packed or have small intercellular spaces.
Importance : The parenchyma performs various functions like photosynthesis, storage, secretion.
(b) Collenchyma Tissues : The collenchyma occurs in layers below the the epidermis in dicotyledonous plants it lacks in monocotyledonous and under ground parts of the plant.
It is found either as homogeneous layer or in patches.
It consists of cells which are much thickened at the corners due to a deposition of cellulose, hemicellulose and pectin.
Collenchymatous cells may be oval, spherical or polygonal amd often contain chloroplasts
These cells assimilate froode when they contain chloroplasts.
Cells lack intercellular speces.
They provide mechanical support to the growing parts of the plant such as young stem and petiole of a leaf.
Cells are alive so growth doesn.t stop whereever it is lacated in organ.

Sclerenchgyma Tissues :
Sclerenchyma consists of long, NARROW cells with thick and lignified cell walls having of few or NUMEROUS pits.
They are usually dead and without protoplasts.
Due to deposition of lignin, cell wall is strong, hard and impermeable for water.
Cells don.t have intercellular spaces.
Location : This tissue is found in organs mechanical strong.
Type : On the basis of variation in form, structure, origin and development, sclerenchyma may be either fibres sclereids.
(i) Fibres : The fibres are thick-walled, elongated and pointed cells generally occuring in groups in various parts of plant.
(ii) Sclereids : These are commonly found in the fruit walls of nuts, pulp o fruits like guava, peat and sapota, seed coats of legumes and leaves of tea.
Cells are spherical, oval or cylindrical highly thickened dead cells with very narrow cavitie (lumen).
Sclerenchyma provides mechanical upport to organs.

(B) Complex Tissues :
The complex tissues are made of more than one type of cells and these work together as unit.
These tissues are associated with transport of water, mineral substances nutrients and organic substance so it is also called a vascular tissue.
There are two types of complex tissues : (a) Xylem tissue and (b) Phleom tissue.
(a) Xylem Tissues :
Xylem functions as a conducting tissue for water and minerals from roots to the stem and leaves.
Structure :It is composed of four differnets kinds of elements, namely, (i) Tracheids, (ii) Vessels, (iii) Xylem Fibres and (iv) Xylem perenchyma.
Gymnosperms lack vessels in their xylem.
(i) Tracheid : Tracheids are elongated or tube like cells with thick and lignified walls and tapering ends.
These are dead and are without protoplasm.
The innner layters of cells walls have thickenings which vary in form.
Function : In flowering plants, tracheids and vassels are the main water transporting elements.
(ii) Vessel : Vessel is a long cylindrical tube like structure made up of many cells called vessel chambers.
Each with lignified walls and large central cavity.
The vessels cells are also devoid of protoplasm.
The vessels members are interconnected through perforations in their common walls.
The presence of vessels is a characteritic feature of angiosperms.
(iii) Xylem Fibres : Xylem fibres have highly thickened walls obliterated central lumens.These may either be septate or asptate.
They give mechanical support. (iv) Xylem Parenchyma : Xylem parenchyma cells are living and thin-walled and their cell walls are made up of cellulose.
They tore food materials in the form of tarch or FAT and other substances like tannins.
The radial conduction of water takes place by the xylem parenchymatous cells.

Primary xylem is o two types : (i) protoxylem and (ii) metaxylem.
The first formed primary xylem elements are clled protoxylem and the later formed primary xylem is called metaqxylem.
In stems, the protoxylem lies towards the centrr (pith) and the metaxylem lies towards the periphery of the organ.
This type of primary xylem is called endarch.
In roots, the protoxylem lies towards periphery and metaxylem lies towards the centre Such arrangement of primary xylem is called exarch.
Phleom Tissue :
Phloem transpoets food material, usually from leaves to other parts of the plant.
Phloem in angiosperms is COMPOUND of sieve tube elements, companion cells, phleom parenchyma and phleom fibres.
Gymnosperms have albuminous cells and sieve cells. They lack sieve tubes and campanion cells.
Sieve tube : Sieve tube elements are aloso long. tube-like structure arranged longitudinally and are associated with the companion cells. Their end walls are perforated in a sieve-like manner to form the sieve plants.
A mature sieve possesses a peripheral cytoplasm and a large vacuole but lacks a nucleus. The functions of sieve tubes are controlled by the nucleus of companion cells.
Companion Cells : The companion cells are specialised parenchymatous cells which are closely associated with sieve tube elements and companion cells are connected by pit fields present between their common longitudinal walls.

the companion cells help in maintaining the pressure gradient in the sieve tubes.
Phleom perenchyma : It is made up of elongated, tepering cylindrical cells which have dense cytoplasm and nucleus. The cell wall is composed of cellulose and has pits through which plasmodesmatal connections exist between the cells.
The phleom parenchyma stores food material and other substances like resins, latex and mucilage.
Phleom parenchyma is absent in mot of the monocotyledons.
Phleom fibres : They are made up of the sclerenchymatous cells. These are generally absent in primary phleom but are found in secondary phleom. They are much elongated, unbranched and have pointed needle like apices.
The cell wall of phleom fibres id quite thick. At maturity, these fibres lose their protoplasm and become dead.
Phleom fibres of jute, flax and hemp are used commercially.
The first formed primary phleom consist of narrow sieve tubes and is referred to as protophleom and the later formed phleom has bigger sieve tubes and is referred to as metaphleom.
Discussion
7904.

Question : What is meant by modification of ropt? What type of modification of root is found in the: (a) Banyan tree (b) Turnip (c) Mangrove trees

Answer»

Solution :In some PLANTS ROOTS change its shape and structure and modified to perform FUNCTIONS other than absorption and conduction of water and minerals. They modified for support storage of food and respiration.
(a) Banyan tree : Prop ROOT for support
(b) Turnip : Food is stored in tap root and becomes whorled.
(C) Mangrove trees : For support modified into breathing roots.
Discussion
7905.

Question : What is meant by modification of root? What type ofmodification of root is found in the : (a) Banyan tree, (b) Turnip, (c) Mangrove trees?

Answer»

Solution :Roots in some plants change their shape and structure and BECOME modified to perform functions other than ABSORPTION and conduction of water and minerals. They are modified for support, STORAGE of food and respiration.(a) Prop roots (adventitious root modification), (b) Napiform roots (tap root modification),(C) Respiratory roots (BRANCH root modification).
Discussion
7906.

Question : What is meant by meristematic tissues ? Explain its various types.

Answer»

Solution :Growth in plants is largely to specialised REGIONS of active cell division called meristems.

Plants have kinds of meristems. They are as follow.
(A) Apical Medistems : The meristems which occur at the tips of roots and SHOOTS and produre PRIMARY TISSUES are called apical meristems.
Root apical meristem occupies the tip of a root while the shoot apical meristem occupies the distant most region of the stem axis.
During the formation of leaves and elongation of stem, some cells.left behind. from shoot apical meristem, conslitute the axillary bud. Such buds are present in the axils of leaves and are capable of forming a branch or a flower.
(B) Itercalary Meristem : The meristem occurs between matures tissues is known a intercalary meristem. They occur in grasses and regenerate parts removed by the grazing harbivares.
Both apical meristems and intercalary meristems are primary maristems because they appear early to life of plant and contribute to the formation on the primary plant body.
(C) Lateral Meristem : The meristem that occurs in the mature regions of roots and shoots of many plants, particularly those that produce woody axis and appear later than primary meristem is called the secondary or lateral meristem.
They are cylindrical meristems. Fascicular vascular cambium, interfascicular cambium and cork-cambium arer EXAMPLES of lateral meristems. These are responsible for producing the secondary tissues.
Discussion
7907.

Question : What is meant by living organism ? How is it different from non-living objects ?

Answer»

SOLUTION :The world is formed of living and non-living things.
The main DIFFERENCE between living and non-living is that all living organisms show the presence of the BASIC unit of LIFE cell.
The structural unit of living organisms is cell. Some organisms show the STRUCTURE of a single cell. They are called unicellular organism while organisms having more than one cells, they are called multicellular organisms.
Discussion
7908.

Question : What is meant by living ? Give any four defining features of life forms.

Answer»

Solution :An organisms said to be living, if is shows certain characteristic feature that makes it different from non-living things.
The following features are defining features of life forms :
(1) Growth : Living things grow by increase in mass and increase in number of individual or cells. In living beings growth is internal.
(2) Reproduction : It is essential to maintain the continuity of life. MANY organisms eg. Mules, sterile worker bees, infertile human couples are not able to reproduce while they have all other defining properties of life so they can be called as living.
(3) METABOLISM : It is the sum total of reactions occurring inside the body by which living things assimilate energy and USE it for growth.
(4) RESPONSE to stimuli : Consciousness and response to stimulus is the defining PROPERTY of all living organisms.
(5) Cellular organisation : The cells are the structural and functional unit of living organisms.
Discussion
7909.

Question : What is meant by floral formula ? Which signs are used to make floral formula ?

Answer»

SOLUTION :Various MORPHOLOGICAL features are used to describe a flowering plant. The plant is described beginning with its habit, vegetative characters-roots, stem and leaves and then floral characters inflorescence and flower PARTS.
After describing various parts of plant, a floral diagram and a floral formula are presented.
The floral formula is represented by some symbols.

In structure of floral formula, after the number of specific whorls, the number of constituent elements of that whorl is presented. The number of units of its floral whorls keep CHANGING according to flowers.
The floral formula and floral diagram SHOWN in figure represent the flower of mustard plant.
Floral formula :
Discussion
7910.

Question : What is meant by Endomembrane system? Which cell organelles are seen in it ? Give information in short.

Answer»

Solution :Each of the membranous organelles is distinct in terms of its structure and function, many of these are considered together as an endomembrane SYSTEM because their functions are coordinated.
The endomembrane system INCLUDE endoplasmic reticulum (ER), golgi COMPLEX, lysosomes and vacuoles.
The functions of the MITOCHONDRIA, chloroplast and peroxisomes are not coordinated with the endomembrane system.
Discussion
7911.

Question : What is meant by cell Theory? Who presented its principles ? Which improvements were done in it ? Describe them.

Answer»

Solution :In 1838, Matthias SCHLEIDEN and Theodore Schwann presented cell theory.
Matthias Schleiden was a German botanist. He showed that all plants are composed of different kinds of cell which form the tissues of the PLANT.
A British zoologist, Theodore Schwann studied different types of animals and reported that cells had a thin outer layer which is KNOWN as the plasma membranae. He showed presence of cell wall as a unique character of the plant cells.
Both the scientists together formulated the cell theory as per that.
(a) All living organisms are composed of cells and its products
(b) Cell is the structural and functional UNIT of all living organisms.
This theory however did not explain as to how new cells were formed.
Rudolf Virchow (in 1855) FIRST explained that cells divided and new cells are formed from pre-existing cells.
Then he modified the hypothesis of Schleiden and Schwann to give the cell theory a final shape.
(i) All living organisms are composed of cells and products of cells.
(ii) All cells arise from pre-existing cells.
Discussion
7912.

Question : What is meant by 'adaptation' ? Give atleast three short term and long term adaptations in living organisms.

Answer»

SOLUTION :ADAPTATION is useful INHERITABLE variation or change (caused by genetic RECOMBINATION(s) mutation(s) or any other method that make an organism to ADJUST well and suited to its way of life.
Discussion
7913.

Question : What is meant by 9+2 pattern of organisation ?

Answer»

Solution :NINE microtubule DOUBLETS AROUND TWO isngle MICROTUBULES.
Discussion
7914.

Question : What is means by double circulation ? What is its significane ?

Answer»

Solution :There aretwo circulatory PATHWAYS seen in our BODY:
(1) Pilmonary circulation pathway
(2) SYSTEMIC circulation pathways
In this both circulation pathways right sectins of heart circulation impure blood and LEFT SECTION circulation pure blood.
Discussion
7915.

Question : What is Maturation Promoting Factor ?

Answer»

Solution :1. One of the proteins synthesized only in the `G_2` PERIOD is known as Maturation promoting factor (MPF).
2. It BRINGS about CONDENSATION of interphase CHROMOSOMES into the mitotisc FORM .
Discussion
7916.

Question : What is Mariculture?

Answer»

Solution :Culturing of animals in the WATER salinity ranges from 30 - 35% is CALLED Mariculture. Some fishes LIKE Chanos sp, Mugil CEPHALUS are cultured here.
Discussion
7917.

Question : What is main iste of rRNA syntheiss ?

Answer»

SOLUTION :NUCLEOLUS.
Discussion
7918.

Question : What is Lysozyme?

Answer»

Solution :The ENZYME present in TEARS which destroys BACTERIA is lysozyme.
Discussion
7919.

Question : What is maculae lutea?

Answer»

Solution : The YELLOW flat spot at the CENTRE of the POSTERIOR REGION of the retina is called macula lutea. It is responsible for SHARP detailed vision.
Discussion
7920.

Question : State Lyon's hypothesis.

Answer»

Solution :Mary Lyon SUGGESTED that BARR bodies represented an inactive chromosome, which in females becomes TIGHTLY coiled into a heterochromatin, a condensed and visible form of chromatin. The number of Barr bodies observed in cell was one LESS than the number of X-Chromosome. XO females have no Barr body, whereas XXY males have one Barr body.
Discussion
7921.

Question : What is lymph? Write its function.

Answer»

Solution :About 90% of fluid that leaks from capillaries eventually seeps back into the capillaries and the REMAINING 10% is collected and RETURNED to blood system by means of a series of TUBULES known as LYMPH vessels or lymphatics. The fluid inside the lymphatics is called lymph.
The lymph nodes successfully prevent the invading MICROORGANISMS from reaching the blood stream. Cells found in the lymphatics are the lymphocytes. Lymphocytes collected in the lymphatic fluid are carried via the arterial blood and are recycled back to the lymph. Fats are absorbed through lymph in the lacteals present in the villi of the intestinal wall.
Discussion
7922.

Question : What is living fossils ? Give two examples.

Answer»

Solution :An organism which is represented by LONG GEOGRAPHICAL record evidenced by its fossil and STILL found in living condition.Examples : Ginkgo and CYCAS .
Discussion
7923.

Question : What is limiting factor ? State the law of limiting factors.

Answer»

Solution :Limiting Factor—A factor which is DEFICIENT to such an EXTENT that increase in its concentration DIRECTLY increase the rate of the process.
Discussion
7924.

Question : Whatis limitingfactor ?

Answer»

SOLUTION :Itisa factorwhichis deficientto SUCHA levelthatenhancementinitsconcentrationdirectly THERATEOF THEPROCESS .
Discussion
7925.

Question : What is lignification?

Answer»

Solution : Lignification. Certain plant cells, NOTABLY those concerned with providing STRENGTH and conducting water, BECOME lignified (converted into wood) during their development. In this process lignin, a polymer of various alcohol derivatives, is deposited in the spaces between the sugar molecules, MAKING the cell wall much more rigid and rendering it impermeable. It thus serves as a water proof cement.
Discussion
7926.

Question :What Is leaf? T Give main parts of leaf.

Answer»

Solution :Leaf:The leaf is a lateral, generally flattened structure borne on the stem. It develops at the node and bears a bud in its axil.
Leaves ORIGINATE from shoot apical meristems and are arranged in an acropetal order.
They are the most important vegetative organs for photosynthesis.
PARTS of leaf: A typical leaf consists of three main parts : Leaf base, petiole and lamina.

Stipules : The leaf is attached to the stem by the leaf base and may bear two lateral small leaf like structures called stipules.
In MONOCOTYLEDONS, the leaf base expands into a sheath covering the stem partially or wholly.
Pulvinus : In some leguminous plants the leaf base may become swollen, which is called the pulvinus.
Petiole: Petiole help hold the blade to light. Long thin FLEXIBLE petioles allow leaf blades to flutter in wind, thereby cooling the leaf and bringing fresh air to leaf surface.
Leaf blade : The lamina or the leaf blade is the green expanded part of the leaf with veins and veinlets. There is, usually, a middle prominent vein, which is known as the midrib. Veins provide rigidity to the leaf blade and ACT as channels of transport for water, minerals and food materials.
Types of Leaves: Shape, margin, apex, surface and incision of lamina is different in different leaves, According to that various types are formed .
Discussion
7927.

Question : What is lamellasome?

Answer»

Solution :It is the MEMBRANOUS in growth of PLASMA MEMBRANE OBSERVED in cyanobacteria.
Discussion
7928.

Question : What is meant by lac culture?

Answer»

SOLUTION :The culture of LAC insect using TECHNIQUES for the PROCUREMENT of lac on large scale is KNOWN as Lac culture.
Discussion
7929.

Question : What is Kranz Anatomy?

Answer»

SOLUTION :The characteristic FEATURE of `C_(4)` plants is the PRESENCE of dimorphic chloroplast:
a) Bundle sheath chloroplast: Larger chloroplast, thylakoids not arranged in granum and rich in STARCH.
b) Mesophyll Chloroplast: Smaller chloroplast, thylako
Discussion
7930.

Question : Give the dental formula of human beings

Answer»

Solution :The arrangement of TEETH in cach HALF of the UPPER and lower jaw in the order of I, C, PAND M can be represented by the DENTAL formula. The dental formula of man is 2123/2123.
Discussion
7931.

Question : Define karyotaxonomy.

Answer»

Solution :1. Utilization of the characters and phenomena of CYTOLOGY for the explanation of TAXONOMIC problem is known as cytotaxonomy or karyotaxonomy.
2. The characters of chromosome such as NUMBER, size, MORPHOLOGY and behaviour during meiosis have proved to be of taxonomic value.
Discussion
7932.

Question : What is keratin ? Where is it present ?

Answer»

SOLUTION :Keratin is an INSOLUBLE protein,present in the upper superficial layers of DEAD cells in the external skin SURFACE.
Discussion
7933.

Question : What is K-T extinction ?

Answer»

Solution :(i) Mass EXTINCTION eliminates HALF or more species in a region or ecosystem, a volcanic eruption. Five MAJOR mass extinction that occurred since the Cambrian period. This mass extinction is often referred to as K-T extinction.
(II) K-T Extinction refers to the German word Cretaceous and Tertiary PERIODS.
Discussion
7934.

Question : What is neuron's main function ?

Answer»

Solution :To stimulate KIDNEYS to absorb `Na^(+)` from URINE and excrete `K^(+)` into urine, thus regulating salt water BALANCE and normal blood VOLUMES
Discussion
7935.

Question : What is the significance of emulsification of fats?

Answer»

Solution :(i) With double circulation there is no MIXING of oxygenated blood and deoxygenated blood. (II) Also the oxygenated blood carries more oxygen and dexoygenated blood carries more carbon DIOXIDE for removal.
Discussion
7936.

Question : Give one function : Pleural fluid.

Answer»

Solution :To lubricate the PLEURA and REDUCE the FRICTION between the membranes during INSPIRATION and expiration.
Discussion
7937.

Question : What is isogamy ?

Answer»

Solution :When fusing gametes are MORPHOLOGICALLY and PHYSIOLOGICALLY SIMILAR type of sexual REPRODUCTION is of isogamous type.
Discussion
7938.

Question : Define ionic regulation.

Answer»

SOLUTION :Ionic REGULATION is the CONTROL of the ionic composition of body fluids.
Discussion
7939.

Question :What is Interspecific hybridization?

Answer»

Solution :Interspecific HYBRIDIZATION
In this method of breeding mating is between male and FEMALE of two different species. The progeny obtained from such crosses are different from their parents, and may possess the DESIRABLE traits of the parents.
Discussion
7940.

Question : What is interferon?

Answer»

secretion in response to fungal infection
secretion in response to bacterial (infection)
secretion in response to VIRAL infection by the CELLS
none of these

Answer :C
Discussion
7941.

Question : What is INOTAXA?

Answer»

SOLUTION :INOTAXA is an electronic resource for DIGITAL images and description about SPECIES. It was developed by Natural HISTORY Museum, London. INOTAXA means Integrated Open Taxonomic Access.
Discussion
7942.

Question : What is initiation complex in transcription?

Answer»

Solution :The ASSEMBLY of the RIBOSOMAL SUBUNITS, MRNA and tRNA represent the INITIATION complex.
Discussion
7943.

Question : What is inflorescence ? Deseribe its types.

Answer»

Solution :A flower is a modified shoor wherein the shoot apical meristem changes to floral meristem Internodes do not elongate and the axis gets condensed. The APEX producesdifferent KINDS of floral appendages laterally at successive nodes instead of leaves.
When a shoot tip transforms into a flower, it is always solitary. The arrangement of flowers on the floral axis is termed as inflorescence. Depending on whether the apex gets converted into a flower or continues to grow, two major TYPES of INFLORESCENCES are defined : (i) Racemose (ii) Cymose
Racemose Inflorescence : In racemose type of inflorescences the main axis continues to grow, the flowers are bome Iaterally in an acropetal succession.
Cymose Inflorescence : In cymose type of inflorescence the main axis terminates in a flower, hence is LIMITED in growth. The flowers are borne in a basipetal order.
Discussion
7944.

Question : What is indirect development?

Answer»

Solution :The development with different TYPES of LARVAL stages is CALLED indirect development.
Discussion
7945.

Question : What is indicated by K_((5)) ?

Answer»

FIVE SEPALS united
Five sepals free
Five PETALS united
Five petals free

Answer :A::D
Discussion
7946.

Question : What is incorrect for oxygen ?

Answer»

It is essential for all the ORGANISMS
Plants are included in the organisms PRODUCING it
Most of the metabolic energy is produced by it
Its PROPORTION in water is 90%

ANSWER :A
Discussion
7947.

Question : What is incomplete double circulation?

Answer»

Solution :In animals like REPTILES MIXING of oxygenated and deoxygenated BLOOD takes place due to incomplete inter ventricular SEPTUM. Thus this is called incomplete double circulation.
Discussion
7948.

Question : What is included in Eukaryotic cells ?

Answer»

Solution :EUKARYOTES include all the protozoa, plants, animals protista and fungi.
Characteristics of Eukaryotic Cells : In Eukaryotic cells there is an extensive compartmentalisation of cytoplasm through the presence of membrane bound ORGANELLES. Eukaryotic cells possess an organised nucleus with a nuclear envelope. In addition, eukaryotic cells have a VARIETY of complex LOCOMOTORY and cytoskeletal structures. Their genetic material is organised into chromosomes.


The difference between plant cell and animal cell :Plant cell and animal cells are different from each other : Plant cell possesses cell wall, plastids and a large central vacuole.
Animal cell LACKS it animal cell has centrioles, plant cell lacks it. 1
Discussion
7949.

Question : What is included in components of food ? What is their contribution in metabolic processes ?

Answer»

Solution :Food is the basic requirement of all living organisms.
The major components of our food are carbohydrates, proteins and fats.
Minerals are also required in small quantities.
Food provides energy.
Food also provides organic materials for growth and repair of tissues.
The water we TAKE in plays part in metabolic processes.
It prevents dehydration of the body.
Bio-macromolecules in food cannot be UTILISED by our body in their ORIGINAL form.
They have to be broken down and converted into simple substances in the digestive system.
The process of conversion of complex food substances into simple absorbable FORMS is called digestion and is carried out by our digestive system by MECHANICAL and biochemical methods.
Discussion
7950.

Question : What is important for the flowering in shortday plants if it is the time of long nights?

Answer»

SOLUTION :UNINTERRUPTED LONG NIGHTS.
Discussion