Mossess and ferns are found in moist and shady places because both
require presence of water for fertilization
do not need sunlight for photosynthesis
depend for their nutrition on microorganisms which can survive only at low temperature
cannot compete with sun-loving plants.
Cork cambium results in the formation of cork which becomes impermeable to water due to the accumulation of
resins
lignins
suberin
tannins.
Assertion: Diabetes insipidus is marked by excessive urination and too much thirst of water.
Reason: Anti-diuretic hormone (ADH) is secreted by the posterior lobe of pituitary gland,
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: 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.
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: Nitrogen-fixing bacteria in legume root nodules survive in oxygen-depleted cells of nodules.
Reason: Legheamoglobin completely removes oxygen from the nodule cells.
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
Symbiotic hemoglobin (leghemoglobin) is a hemeprotein found in micromolar concentrations in infected cells of legume roots. This is an essential component for nitrogen fixation by legumes. Leghemoglobin is produced as a result of symbiotic association between bacteroid and plant.
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.
Cultivation of Bt cotton has been much in the news. The prefix Bt means
"Barium-treated" cotton seeds
"Bigger thread" variety of cotton with better tensile strength
produced by "biotechnology" using restriction enzymes and ligases
carrying an endotoxin gene from Bacillus thuringienesis.