STD 12 - 9. biotechnology principlas and process — NEET STD 11 Science — Question

They show haplontic life cycle

'Palade granules' are

Which one of the following statements are correct ?
(i) The living differentiated cells which have lost the capacity to divide can regain the capacity of division under certain conditions. This phenomenon is termed as dedifferentiation.
(ii) Formation of meristems- intrafascicular cambium and cork-cambium from fully differentiated parenchyma cells are the example of dedifferentiation.
(iii) Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called plasticity.
(iv) Plant hormone which is derivative of carotenoids are GA.
(v) The coleoptiles of canary grass responded to unilateral illumination by growing towards the light source.
(vi) Auxin was isolated by F.W.Went from tips of coleorhiza of oat seedlings.
(vii) The "bakane' disease of rice seedlings was caused by a fungal pathogen Gibberella fujikuroi.
(viii) Skoog and Miller crystallized the cytokinesis promoting active substance that they termed as ziatın.
(ix) Inhibitor-B and dormin were proved to be chemically identical and was named ABA.
(x) Auxin was first isolated from human urine.
(xi) NAA and 2,4-D are natural auxins.
Choose the correct option given below :-

Terminalisation of chiasmata occurs during

If a planter is interested in obtaining a good crop of tea leaves from a single plant, he should

Bryophytes differ from pteridophytes in

Intine of pollen grains is composed of

Which parameter is used to measure the growth in flat organs like leaves?

‘‘Biomass’’ is the