Below is a list of plant fibres.
Question: Below is a list of plant fibres. From which part of the plant these are obtained a. Coir b. Hemp c. Cotton d. Jute Solution: a. Coir is a natural fibre obtained from coconut husk. b. Hemp fibre is obtained from the stem of cannabis Sativa. c. Cotton fibre is obtained from epidermal growth of cotton seeds. d. Jute is natural bast fibre is obtained from the stem of Corchorus capsularis....
Read More →What is the commercial source of cork?
Question: What is the commercial source of cork? How is it formed in the plant? Solution: The commercial source of cork is cork tissue of Quercus suber. Due to the activity of vascular cambium, the stem continues to increase in girth. Therefore the outer cortical and epidermis layer gets broken to provide new protection it has to be replaced....
Read More →While eating peach or pear it is usually seen that some
Question: While eating peach or pear it is usually seen that some stone-like structures get entangled in the teeth, what are these stone-like structures called? Solution: The stone-like structures present in peach or pear is stone cells also known as Sclerieds. They are a type of Sclerenchyma which provides mechanical support to organs....
Read More →What do hardwood and softwood stand for?
Question: What do hardwood and softwood stand for? Solution: Hardwood is wood from an angiosperm, whereas softwood is wood from gymnosperm....
Read More →The cross-section of a plant material showed
Question: The cross-section of a plant material showed the following features when viewed under the microscope. a. The vascular bundles were radially arranged. b. Four xylem strands with exarch condition of protoxylem. To which organ should it be assigned? Solution: The cross-section is of dicot root. Vascular bundles are present are arranged alternately on separate radii thus called a radial arrangement....
Read More →If one debarks a tree,
Question: If one debarks a tree, what parts of the plant is being removed? Solution: If one debarks a tree then periderm part (i.e., all tissues exterior to vascular cambium) of the plant is being removed....
Read More →Arrange the following in the sequence
Question: Arrange the following in the sequence you would find them in a plant starting from the periphery phellem, phellogen, phelloderm. Solution: Phellem Phellogen Phelloderm Phellem or cork is the outermost layer, followed by phellogen (cork cambium) which in turn is followed by phelloderm (secondary cortex)....
Read More →Give one basic functional difference
Question: Give one basic functional difference between phellogen and phelloderm? Solution: The basic functional difference between phellogen and phelloderm is: Phellogen is a meristematic tissue and Phelloderm is a permanent tissue. Phellogen is called as Cork Cambium, Phelloderm is called as Secondary Cortex....
Read More →What constitutes the cambial ring?
Question: What constitutes the cambial ring? Solution: Interfascicular cambium and Intrafascicular cambium constitutes cambial ring. It is formed due to the meristematic activity of cambium....
Read More →Evaluate the following integrals:
Question: Evaluate the following integrals: $\int \frac{\operatorname{cosec} x}{\operatorname{cosec} x-\cot x} d x$ Solution: Let $I=\int \frac{\operatorname{cosec} x}{\operatorname{cosec} x-\cot x} \mathrm{dx}$ On multiplying and dividing $(\operatorname{cosec} x+\cot x)$, we can write the integral as $I=\int \frac{\operatorname{cosec} x}{\operatorname{cosec} x-\cot x}\left(\frac{\operatorname{cosec} x+\cot x}{\operatorname{cosec} x+\cot x}\right) d x$ $\Rightarrow I=\int \frac{\operatorname{co...
Read More →What are the cells that make the leaves
Question: What are the cells that make the leaves curl in plants during water stress? Solution: The cells that make the leaves curl in plants during water stress are Bulliform cells. The epidermal cell modification in plants which prevents water loss is known as Bulliform Cells....
Read More →What is the epidermal cell modification in plants
Question: What is the epidermal cell modification in plants which prevents water loss? Solution: The epidermal cell modification in plants which prevents water loss is known as Bulliform Cells. 6. What part of the plant would show the following? a. Radial vascular bundle b. Polyarch xylem c. Well developed pith Solution: (a) Radial Vascular bundle is present in roots. Radial Vascular bundle includes xylem and phloem, and these are present in separate radii of the roots. (b) Polyarch xylem is pre...
Read More →What is present on the surface of the leaves
Question: What is present on the surface of the leaves which helps the plant prevent loss of water but is absent in roots? Solution: The cuticle is present on the surface of the leaves which helps the plant prevent loss of water. The cuticle is absent in roots...
Read More →What is the function of phloem
Question: What is the function of phloem parenchyma? Solution: The function of phloem parenchyma is to store food material and other substances like resins, latex and mucilage and also help in translocation of foods....
Read More →Evaluate the following integrals:
Question: Evaluate the following integrals: $\int \frac{\tan x}{\sec x+\tan x} d x$ Solution: Let $I=\int \frac{\tan x}{\sec x+\tan x} d x$ On multiplying and dividing $(\sec x-\tan x)$, we can write the integral as $I=\int \frac{\tan x}{\sec x+\tan x}\left(\frac{\sec x-\tan x}{\sec x-\tan x}\right) d x$ $\Rightarrow I=\int \frac{\tan x(\sec x-\tan x)}{(\sec x+\tan x)(\sec x-\tan x)} d x$ $\Rightarrow I=\int \frac{\sec x \tan x-\tan ^{2} x}{\sec ^{2} x-\tan ^{2} x} d x$ $\Rightarrow I=\int\left(...
Read More →Protoxylem is the first formed xylem.
Question: Protoxylem is the first formed xylem. If the protoxylem lies next to phloem what kind of arrangement of xylem would you call it? Solution: If the protoxylem lies next to phloem, this type of arrangement of xylem is known as Exarch which is present in the roots....
Read More →Product of photosynthesis is transported
Question: Product of photosynthesis is transported from the leaves to various parts of the plants and stored in some cell before being utilised. What are the cells/ tissues that store them? Solution: Parenchyma which is thin and made up of cellulose stores the product of photosynthesis before being transported or utilized by the various parts of the plants....
Read More →What is the fate of primary xylem in a dicot
Question: What is the fate of primary xylem in a dicot root showing extensive secondary growth? a. It is retained in the centre of the axis b. It gets crushed c. Mayor may not get crushed d. It gets surrounded by primary phloem Solution: Option (a)It is retained in the centre of the axisis the answer....
Read More →Which one of the following cell types always divides
Question: Which one of the following cell types always divides by anticlinal cell division? a. fusiform initial cells b, root cap c. protoderm d. phellogen Solution: Option (c)protoderm is the answer....
Read More →A vessel less piece of stem possessing
Question: A vessel less piece of stem possessing prominent sieve tubes would belong to a. Pinus b. Eucalyptus c. Grass d. Trochodendron Solution: Option (d)Trochodendronis the answer....
Read More →When we peel the skin of a potato tuber,
Question: When we peel the skin of a potato tuber, we remove a. Periderm b. Epidermis c. Cuticle d. Sapwood Solution: Option (a) Periderm is the answer....
Read More →Evaluate the following integrals:
Question: Evaluate the following integrals: $\int \frac{1}{1-\sin x} d x$ Solution: Let $\mathrm{I}=\int \frac{1}{1-\sin \mathrm{x}} \mathrm{dx}$ On multiplying and dividing $(1+\sin x)$, we can write the integral as $I=\int \frac{1}{1-\sin x}\left(\frac{1+\sin x}{1+\sin x}\right) d x$ $\Rightarrow I=\int \frac{1+\sin x}{(1-\sin x)(1+\sin x)} d x$ $\Rightarrow I=\int \frac{1+\sin x}{1-\sin ^{2} x} d x$ $\Rightarrow I=\int \frac{1+\sin x}{\cos ^{2} x} d x\left[\because \sin ^{2} \theta+\cos ^{2} ...
Read More →In conifers, fibres are likely to
Question: In conifers, fibres are likely to be absent in a. Secondary phloem b. Secondary xylem c. Primary phloem d. Leaves Solution: Option (b)Secondary xylemis the answer....
Read More →A plant tissue, when stained,
Question: A plant tissue, when stained, showed the presence of hemicellulose and pectin in the cell wall of its cells. The tissue represents a. Collenchyma b. Sclerenchyma c. Xylem d. Meristem Solution: Option (a)Collenchymais the answer....
Read More →A piece of wood having no vessels
Question: A piece of wood having no vessels (trachea) must belong to a. Teak b. Mango c. Pine d. Palm Solution: Option (c)Pineis the answer....
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