AIIMS Biology Plant Growth And Development Class 11 Questions

Which hormone inhibit morphogenesis

Which increase shoot growth in callus culture?

Assertion: Gibberellin is useful in early seed production in conifers. Reason: Ethephon is responsible for early ripening in tomato and apple

Assertion: In vernalization, flowering is induced by low temperature Reason: ABA is growth inhibiting hormone

Which of the following helps bamboo and grasses to elongate?

Assertion (A) Photomodulation of flowering is a phytochrome regulated process. Reason (R) Active form of phytochrome directly induces floral induction in shoot bud.

Assertion: On plotting the length of the root against time, a linear curve is obtained. Reason: An elongating root exemplifies arithmetic growth.

Abscisic acid is known as the stress hormone because it

What are labelled phases A, B and C in given sigmoidal growth curve?

Assertion : Plant growth as a whole is indefinite. Reason : Plants retain the capacity of continuous growth throughout their life.

Assertion: Nuclear endosperm is formed by subsequent nuclear division without wall formation. Reason: Coconut is an example of such endosperm, where the endosperm remains nuclear throughout the development of the fruit.

Avena curvature test is a bioassay for examining the activity of

Gibberellins can promote seed germination because of their influence on

Assertion : Senescence is the time when age associated defects are manifested. Reason : Certain genes may be undergoing sequential switching on and off during one's life.

Pruning of plants promotes branching because the axillary buds get sensitized to

The quiescent centre in root meristem serves as a

Bud dormancy is induced by

Apical dominance can be overcome by application of

Assertion: Plants also have hormones called as phytohormones. Reason: They increase the rate of reactions and thus always accelerate growth and other related changes.