Description : Sapwood consists of (A) Innermost annular rings around the pith (B) Portion of timber between heartwood and cambium layer (C) Thin layers below the bark (D) Thin fibre which extends from the pith outwards and holds the annular rings together
Last Answer : Answer: Option B
Description : The age of a tree can be known by examining (A) Cambium layer (B) Annular rings (C) Medullary rays (D) Heart wood
Description : As a tree grows older, which of the following increases more rapidly in thickness? (a) Heart wood (b) Sapwood (c) Phloem (d) Cortex
Last Answer : (a) Heart wood
Description : Veneering means (A) Carving out designs on timber planks (B) Chemically treating timber planks (C) Thick layer of superior wood glued to inferior wood (D) Thin layer of superior wood glued to inferior wood
Last Answer : Answer: Option C
Description : A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is (a) cork cambium (b) vascular cambium (c) endodermis (d) pericycle.
Last Answer : (b) vascular cambium
Description : Which exposed wood will decay faster? (a) Sapwood (b) Softwood (c) Wood with lot of fibres (d) Heartwood
Last Answer : a) Sapwood
Description : Plywood is made from (A) Common timber (B) Bamboo fibre (C) Teak wood only (D) Asbestos sheets
Description : Consider the following statements: 1. Dry rot in sap wood is caused by fungal attack 2. Brown rot in coniferous woods is a result of fungal attack 3. Alternate wetting and drying of unseasoned timber causes powdery' form of decay in ... ? (a) 1, 2 and 3 b)1 and 2 only c)2 and 3 only d)1 and 3 only
Last Answer : (a) 1, 2 and 3
Description : Gymnosperms are also called soft wood spermatophytes because they lack (a) cambium (b) phloem fibres (c) thick-walled tracheids(d) xylem fibres
Last Answer : (d) xylem fibres.
Description : Gymnosperms are also called soft wood spermatophytes because they lack (1) Xylem fibres (2) Cambium (3) Phloem fibres (4) Thick-walled tracheids
Last Answer : (4) Thick-walled tracheids
Description : Which of the statements given below is not true about formation of annual rings in trees? (a) Annual rings are not prominent in trees of temperate region. (b) Annual ring is a combination ... of tissue-early and late wood respectively. (d) Activity of cambium depends upon variation in climate.
Last Answer : a) Annual rings are not prominent in trees of temperate region
Description : The inner surface of the membrance surrounding a muscle fibre is :-
Last Answer : The inner surface of the membrance surrounding a muscle fibre is :- A. Negatively charged B. Positively charged C ... D. A storage depot of `Ca^(++)`
Description : The matrix surrounding the grana in the inner membrane of chloroplasts is (A) Cytosol (B) Frets (C) Stroma (D) Inter-granal lamellae
Last Answer : (C) Stroma
Description : A rectangular log of wood is floating in water with a load of 100 N at its centre. The maximum shear force in the wooden log is (A) 50 N at each end (B) 50 N at the centre (C) 100 N at the centre (D) None of these
Last Answer : (C) 100 N at the centre
Description : The balloon-shaped structures called tyloses (a) originate in the lumen of vessels (b) characterise the sapwood (c) are extensions of xylem parenchyma cells into vessels (d) are linked to the ascent of sap through xylem vessels.
Last Answer : (c) are extensions of xylem parenchyma cells into vessels
Description : When many islands of phloem embedded in xylem layer due to anomalous activity of cambium are formed such phloems are known as
Last Answer : When many islands of phloem embedded in xylem layer due to anomalous activity of cambium are formed such phloems are known as – Included phloem
Description : In a plant, the layer of persistently meristematic tissue, giving rise to secondary tissues, resulting in growth in diameter is which of the following? a) bark b) cambium c) capsule
Last Answer : ANSWER: B -- CAMBIUM
Description : Differentiate between heartwood and sapwood? -Biology
Last Answer : answer:
Description : Heartwood differs from sapwood in (a) presence of rays and fibres (b) absence of vessels and parenchyma (c) having dead and non-conducting elements (d) being susceptible to pests and pathogens.
Last Answer : (c) having dead and non-conducting elements
Description : Identify the incorrect statement. (a) Heartwood does not conduct water but gives mechanical support. (b) Sapwood is involved in conduction of water and minerals from root to leaf. (c) Sapwood is the innermost ... . (d) Due to deposition of tannins, resins, oils, etc., heartwood is dark in colour.
Last Answer : (c) Sapwood is the innermost secondary xylem and is lighter in colour
Description : The radial splits which are wider on the outside of the log and narrower towards the pith are known as (A) Heart shakes (B) Cupshakes (C) Starshakes (D) Rindgalls
Description : A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted ... ) Remain unaffected (D) May increase or decrease; depends on the thickness of each layer
Last Answer : Option C
Description : The term ‘glycocalyx’ is used for (a) a layer present between cell wall and membrane of bacteria (b) cell wall of bacteria (c) bacterial cell glyco-engineered to possess N-glycosylated proteins (d) a layer surrounding the cell wall of bacteria.
Last Answer : (d) a layer surrounding the cell wall of bacteria.
Description : For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ... through ash layer (C) Chemical reaction (D) Either (A), (B) or (C)
Last Answer : (C) Chemical reaction
Description : For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, ... through ash layer (C) Chemical reaction (D) Either (A), (B) or (C)
Last Answer : (B) Diffusion through ash layer
Description : The presence of original rounded surface on the manufactured piece of timber, is called (A) Wane (B) Torn grain (C) Diagonal grain (D) Chipmark
Last Answer : Answer: Option A
Description : Apiece of sawn timber whose cross-sectional dimensions exceed 5 cm, in one direction and 20 cm in the other direction, is called a (A) Cant (B) Deal (C) Baulk (D) Strip
Description : A piece of timber whose thickness and width are respectively 5 cm and 10 cm is called (A) Slate (B) Plank (C) Board (D) Strip
Last Answer : Answer: Option D
Description : The horizontal timber piece provided at the apex of a roof truss which supports the common rafter is called (A) Ridge board (B) Hip rafter (C) Eaves board (D) Valley rafte
Description : The advantage of a concrete pile over a timber pile, is (A) No decay due to termites (B) No restriction on length (C) Higher bearing capacity (D) All the above
Description : The smoothened surface of the front face of the guay walls, is known as fending which is made of (A) Granite stone (B) Timber (C) Steel (D) All the above
Last Answer : (D) All the above
Description : The most valuable timber may be obtained from (A) Chir (B) Shishum (C) Sal (D) Teak
Description : Dry rot (A) Cracks the timber (B) Reduces the strength of timber (C) Reduces the timber to powder (D) Spoils the appearance of timber
Description : Seasoning of timber is essential to remove (A) Knots from timber (B) Sap from timber (C) Twisted fibre from timber (D) Roughness of timber
Description : A well seasoned timber may contain moisture up to (A) 4 to 6 % (B) 6 to 8 % (C) 8 to 10 % (D) 10 to 12 %
Description : Knots in timber are (A) Defects caused by crushing fibres (B) Splits radiating from the centre (C) Speckled strains (D) Signs of branches cut off
Description : The timber having maximum resistance against white ants, is obtained from (A) Chir (B) Shishum (C) Sal (D) Teak
Description : The most commonly used base for timber painting, is (A) Red lead (B) Zinc white (C) White lead (D) Titanium white
Description : The moisture content in a well seasoned timber is (A) 4 % to 6 % (B) 10 % to 12 % (C) 15 % to 20 % (D) 100 %
Description : Seasoning of timber is done for (A) Increasing moisture content (B) Decreasing moisture content (C) Increasing strength of timber (D) None to these
Description : The practical limit of moisture content achieved in air drying of timber is (A) 5 % (B) 15 % (C) 25 % (D) 35 %
Description : Pick up the correct statement from the following: Method of sawing timber (A) Tangentially to annual rings, is known as tangential method (B) In four quarters such that each board cuts annual rings ... medullary rays and perpendicular to annual rings, is known as radial sawing (D) All the above
Description : According to IS 399-1963, the weight of the timber is specified at (A) 8% moisture content (B) 10% moisture content (C) 12% moisture content (D) 14% moisture content
Description : First class timber has an average life of (A) Less than one year (B) 1 to 5 years (C) 5 to 10 years (D) More than 10 years
Description : Seasoning of timber is done (A) To make it water proof (B) To paint its surface (C) To increase its temperature (D) To remove water
Description : Due to attack of dry rot, the timber (A) Cracks (B) Shrinks (C) Reduces to powder (D) None of these
Description : The maximum permissible deflection of a timber beam supporting a roof, is (A) L/100 (B) L/150 (C) L/260 (D) L/360
Description : In which of the following directions, the strength of timber is maximum? (A) Parallel to grains (B) 45° to grains (C) Perpendicular to grains (D) Same in all directions
Description : The disease of dry rot in timber is caused by (A) Lack of ventilation (B) Alternate wet and dry conditions (C) Complete submergence in water (D) None of the above
Description : Suitable spacing of timber piles, is (A) 50 cm (B) 60 cm (C) 80 cm (D) 90 cm