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 Multiple Choice QuestionsMultiple Choice Questions

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1.

Assertion: Deficiency of sulphur causes chlorosis in plants.

Reason: Sulphur is a constituent of chlorophyll, proteins and nucleic acids.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false.


C.

If Assertion is true but Reason is false

Mechanistically, iron and/or sulfur are highly reactive components of many enzymes. Indeed, iron and sulfur sometimes form Fe2S2, Fe3S4, or Fe4S4 clusters which are very active electron transfer agents. Recently, iron‐sulfur clusters have been reported to serve as sensors of oxidative stress, to couple photosynthesis with several metabolic pathways, to participate in the reduction of sulfite and nitrite, and to participate in regulation of gene expression. Thus, there are several mechanisms by which a deficiency of nitrogen, sulfur, or iron could produce the same low‐chlorophyll, yellow phenotype in plants.


2.

Coconut's husk fibre, coir of commerce is extracted from

  • epicarp

  • mesocarp

  • endocarp

  • all of these


B.

mesocarp

Commercial coir is obtained from the fibrous husk or mesocarp of fruits of coconut palm. It is valued for its lightness and high resistance to mechanical wear and dampness.


3.

Clove is a

  • floral bud

  • modified root

  • auxillary bud

  • seed


A.

floral bud

Cloves are unopened and aromatic floral buds of a tree in the Family- Myrtaceae, Syzygium aromaticum. It is commonly used as a spice.


4.

Cotton belongs to family :

  • Solanaceae

  • Cucurbitaceae

  • Leguminoseae

  • Malvaceae


D.

Malvaceae

Cotton belongs to family Malvaceae. Surface fibres are obtained from cotton seed hairs which are used in textile industries for making clothes. The long fibres are called as 'lint' and short as 'fuzz'.


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5.

Assertion: Ginger has a prostrate-growing rhizome.

Reason: Shoot growth is not effected by gravity

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false.


B.

If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

Rhizome are prostrate, thickened stem, creeping horizontally under the surface of the soil. The common example is ginger. It is provided short node and distinct internodes. It bears
some scaly leaves at the nodes, possesses a bud in the axil of the scaly leaf and ends in a terminal bud. The response of plant to wards gravity is called geotropism. The roots are positively geotropic and grow downwards, while the shoot is negatively geotropic and grows away from the gravitational pull from the centre of earth. Parts which show no effect of gravity are called ageotropic.


6.

Biologically most resistant plant material is

  • sporopollenin

  • cutin

  • lignin

  • suberin


A.

sporopollenin

Sporopollenin is biologically most resistant plant material and is present in pollen exine. It is contributed by the tapetum layer of the another wall.


7.

Assertion: Photomodulation of flowering is a phytochrome - regulated process.

Reason: Active form of phytochrome (Pfr) directly induces floral induction in shoot buds.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false.


C.

If Assertion is true but Reason is false

Phytochrome regulates flowering in plants. Phytotchrome is a blue protein pigment with a molecular mass of about 125 k Da (kilodaltons).

Phytochrome occurs in two interconvertible form

PR (which absorbs red light) and Pfr (which absorbs far red light). The studies with mutants of Arabidopsis support and prove that the Pfr is the active form of phytochrome. When PR molecules are exposed to red light, most of them absorb it and converted to Pfr This causes floral induction in the shoot.


8.

From which part of Cocos nucifera, coir is obtained :

  • Endocarp

  • Mesocarp

  • Epicarp

  • Any part of fruit


B.

Mesocarp

Coir is obtained from the mesocarp of Cocos nucifera or Coconut. It belongs to Family- Arecaceae. It is used for making carpets, floor matting, coarse textiles, door mats etc.


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9.

Which floral family has (9) + 1 arrangement or anthers in the androecium ?

  • Malvaceae

  • Rutaceae

  • Fabaceae

  • Caesalpinaceae


C.

Fabaceae

In Fabaceae stamens have diadelphous arrangement i.e. (9) + 1. In total these are 10 in number.


10.

Assertion: The epithelial layer of scutellum of maize is both secretory and absorptive in function.

Reason: The epithelial layer secretes hormones into the endosperm for the synthesis of food
solubilising enzymes and also absorbs and transfers the solubiliscd food to embryo axis.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false.


A.

If both Assertion and Reason are true and Reason is the correct explanation of Assertion

Scutellum the only growth activity during germination is the development of every epithelial cell into a separate elongated papilla. These papillae are involved in secretion of hydrolases, gibberellins and other hormonal factors which in their turn activate the aleurone layer; and in absorption of the mobilized endosperm reserves.


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