STD 11 - 9. Biomolecules — NEET STD 11 Science — Question

Choose incorrect statements from given characters of DNA and chromosome :
(i) Length of DNA double helix in a typical mammalian cell is calculated by multiplying the total number of bp with distance between two consecutive bp.
(ii) The length of DNA double helix in a typical mammalian cell is approximately 2.2 metres.
(iii) The dimension of a typical nucleus is approximately 10 m and it is larger than length of DNA.
(iv) In prokaryotes, DNA present in 'nucleoid' where DNA is organised in large loops held by proteins.
(v) In prokaryotes, negatively charged DNA is wrapped around the positively charged basic histone proteins octamer to form a structure called nucleosome.
(vi) Histones are rich in the basic amino acid residues lysines and arginines and both the amino acid residues carry positive charges in their side chains.

Source of energy in an ecosystem is

Identify the fungi which do not belong to the group of other fungi among the following :

Plant growth is unique in being

Which of the following statements regarding cyanobacteria is incorrect?

Pyrenoid is found in one of the following part of Spirogyra

In angiosperms, the functional megaspore of a linear tetrad is the

The measure of the variety of species and their relative abundance present within a region is referred to as

Glycosidic bond is present in

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 :-