Multiple Choice QuestionsPhototropic curvature is the result of uneven distribution of
gibberellin
phytochrome
cytokinins
cytokinins
D.
cytokinins
Darwin and his son Francis used germinating oat (Avena sativa) and canary grass (phalaris canaries) seeding in their experiments and hypothesised that when shoots were illuminated from one side, they bent forward the light in response to an influence, that was the tip of the shoot. Paal concluded that the tip secretes a substance, which promotes the growth of part below it. In 1926, Frits Went discovered that some unidentified compound probably caused curvature of oat coleoptile towards the light, i.e, phototropism. The compound (auxin) found by Went is relatively abundant in coleoptile tips.
Male and female gametophytes are independent and free - living in
mustard
castor
Pinus
Pinus
The technical term used for the androecium in a flower of China rose (Hibiscus rosa siensis( is
monadelphous
diadelphous
polyandrous
polyandrous
During mitosis ER and nucleolus begin to disappear at
late prophase
early metaphase
late metaphase
late metaphase
The free-living, anaerobic nitrogen - fixer is
Beijerinckia
Rhodospirillum
Rhizobium
Rhizobium
What is true about RBCs in humans?
They carry about 20-25 percent of CO2
They transport 99.5 percent of O2
They transport about 80 percent oxygen only and the rest 20 percent of it is transported in dissolved state in blood plasma
They transport about 80 percent oxygen only and the rest 20 percent of it is transported in dissolved state in blood plasma
The main arean of various types of activities of a cell is
Plasma membrane
mitochondrion
cytoplasm
cytoplasm
The principal nitrogenous exceretory compound in humans is synthesised
in kidneys but eliminated mostly through the liver
in kidneys as well as eliminated by kidneys
In liver and also eliminated by the same through bile
In liver and also eliminated by the same through bile
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