Which cell organelle is covered by only one unit membrane ?
Nucleus
Plastids
Mitochondria
Lysosome
The S-phase of cell cycle is characterized by:
duplication of chromosome
shotening of chromosome
duplication of DNA
duplicatin of centriole
Phytotron is :
a controlled condition chamber for tissue
leaf culture process
special culture of plants
root culture process
If centromere is the middle, the chromosome is called :
sub-metacentric
metacentric
acentric
telocentric
Which hormone is responsible for mobilization of storage food during seed germination ?
Auxin
Gibberellin
Cytokinin
Ethylene
B.
Gibberellin
Gibberellin is responsible for mobilization of storage food during seed germination. After getting moisture, the embryo of seed releases gibberellins. It induces the alemone layer of endosperm to produce enzymes (e.g. -amylase). These enzymes digest stored starch to mobilize sugars for germination.