STD 12 - 1. sexual reproduction in flowering plants — NEET STD 11 Science — Question

Cell elongation in internodal region takes place due to

The chemical substance most abundantly present in the middle lamella is

Geitonogamy involves

Who isolated auxin from tips of coleoptiles of oat seedling?

Which one of the following statements are correct ?
(A) In all of the higher plants, the growing apical bud inhibits the growth of the lateral buds, a phenomenon called apical dominance.
(B) Decapitation usually results in growth of lateral buds.
(C) 2,4-D is widely used to kill dicotyledonous weeds, does not affect immature monocotyledonous plants.
(D) Auxin controls xylem differentiation and helps in cell division.
(E) GA₃ was one of the first gibberellins to be discovered and remains the most intensively studied form.
(F) Gibberellins cause fruits like apple to elongate and improve its shape.
(G) GA₃ is used to speed up the malting process in brewing industry.
(H) Gibberellin promotes bolting in beet, cabbages and many plants with rosette habit.
(I) Cytokinins have specific effects on cytokinesis, and were discovered as kinetin from the autoclaved herring sperm RNA.
(J) Cytokinins help to overcome the apical dominance.
(K) Influence of Ethylene on the plants includes horizontal growth of seedlings, swelling of the axis and apical hook formation in monocot seedlings.
Choose the correct option given below :-

The first phase of mitosis which follows interphase is

The common phase between aerobic and anaerobic respiration is called

You are given a tissue with its potential for differentiation in an artifical culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

The net primary productivity of an ecosystem is