STD 11 - 3. Plant kingdom — NEET STD 11 Science — Question

Statement I: Zinc is a cofactor for the proteolytic enzyme carboxypeptidase.
Statement II: If co-factor is remove there will be no effect on catalytic activity of enzyme.

Which of the following is formed after dedifferentiation?

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 :-

Four chromatids and two centromeres which are homologous occurs in

If producer is a large tree that supports a number of herbivorous animals which are further attacked by ectoparasites, the pyramid of number shall be

Most primitive living vascular plants are

Assertion: The sclereids are commonly found in the fruit walls of nuts; pulp of fruits like guava, pear and sapota; seed coats of legumes and leaves of tea.
Reason: Sclerenchyma have intercellular space and store food.