Multiple Choice QuestionsThe family containing mustard and its main characters are
Brassicaceae - Tetramerous flowers, six stamens, bicarpellary gynoecium, siliqua type fruit
Brassicaceae - Pentamerous flowers, many stamens, pentacarpellary gynoecium, capsule type fruit
Solanaceae - Pentamerous flowers, five stamens, bicarpellary gynoecium, berry type fruit
Poaceae - Trimerous flowers, three stamens, monocarpellary gynoecium, caryopsis type of fruit.
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.
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.
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.
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.
Two chief functions of the leaves are
photosynthesis and respiration
photosynthesis and transpiration
transpiration and respiration
respiration and digestion
A flower characterised by monadelphous tubular stamens belongs to :
Solanaceae
Liliaceae
Malvaceae
Brassicaceae
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