Assertion: No secondary growth takes place in monocots.
Reason: Secondary growth is not related with cambium.
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.
Secondary growth is the growth in thickness due to the formation of secondary tissues by lateral meristems. With the exception of some annuals, most of the dicots and gymnosperms show secondary growth in their stems and roots. It takes place by the production of two types of secondary tissues: secondary vascular tissues and periderm. These tissues are formed by meristems, vascular cambium and cork cambium respectively.
Secondary growth does not occur in monocots because monocots do not possess vascular cambium in between the vascular bundles.
Assertion: Yeasts are unicellular fungi that are used in bakery and brewery industries.
Reason: Potato spindle tuber disease is caused by viroids
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.
One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses. They are respectively
Gibberellin, Auxin, Ethylene
Auxin, Gibberellin, Cytokinin
Gibberellin, Auxin, ABA
Auxin, Gibberellin, ABA
Gibberellins can promote seed germination because of their influence on
rate of cell division
production of hydrolysing enzymes
synthesis of abscisic acid
absorption of water through hard seed coat.
Assertion: Plant growth regulators (PGRs) are very important for plant growth and development.
Reason: Auxins do not induce flowering in gymnosperms
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: A correct concentration of auxin and cytokinin is required for the development of root and shoot in a callus.
Reason: When the ratio of kinetin to auxin is high, then only shoots develop. But when the ratio is low then only roots develop.
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.
Vernalisation is subjected to plants growing in
tropical areas
sub tropical areas
temperate areas
hot areas/arctic region.
The phenomenon that operates in the formation of root or shoot in a callus culture is
differentiation
re-differentiation
de-differentiation
re-juvenation
Which of the following genes do not occur naturally in living organisms
Bt genes
RNAi genes
Cry genes
Endogeneous cytoplasmic defence genes
