Recent questions tagged botany

How many molecules of ATP are gained during anaerobic respiration of one molecules of glucose?

asked Apr 3, 2014 by sreemathi.v

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In which of the following , respiration in absence of oxygen too takes place?

asked Apr 3, 2014 by sreemathi.v

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In anaerobic respiration in plants

asked Apr 3, 2014 by sreemathi.v

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Most promoter sites for RNA polymeraseII have conserved sequence located about 25-35 bp upstream of the transcriptional start site known as

asked Apr 3, 2014 by pady_1

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In which condition, a trp repressor protein is synthesized but doesnt bind to the trp operator and thus trp operon is transcribed to produce enzymes that synthesize tryptophan for the cell ?

asked Apr 3, 2014 by pady_1

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Expand IPTG

asked Apr 3, 2014 by pady_1

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The lac operon is transcribed by RNA polymerase to produce a ___________.

asked Apr 3, 2014 by pady_1

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The primer used during DNA synthesis, is a short piece of RNA and is synthesized by RNA polymerase called

asked Apr 3, 2014 by pady_1

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In eukaryotic cell, (a) DNA in chromosomes consist of histone proteins like HU, HSP-1 and H-NS and (b) each chromosome contains a single linear double-stranded DNA molecule.

asked Apr 3, 2014 by pady_1

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On the other template strand (that has 5' 3' orientation) DNA polymerase synthesizes short pieces of new DNA in 5' 3' direction and then joins them, these are known as

asked Apr 3, 2014 by pady_1

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Respiration in plants

asked Apr 3, 2014 by sreemathi.v

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Which of the following is the site of synthesis of (or codes for) histone mRNA ?

asked Apr 3, 2014 by pady_1

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Which of the following are found only in organisms containing polycistronic mRNA ?

asked Apr 3, 2014 by pady_1

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Which of the following is most likely mechanism for the origin of multigene families ?

asked Apr 3, 2014 by pady_1

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Which of the following is not involved in the processing of mRNA precursors in eukaryotic cells ?

asked Apr 3, 2014 by pady_1

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6-benzylaminopurine (BAP) belongs to which class of plant growth regulators or hormones ?

asked Apr 3, 2014 by pady_1

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During translation in prokaryotes, which sequence lies 5' to the AUG initiation codon and is the binding site for the 30S ribosomal subunit ?

asked Apr 3, 2014 by pady_1

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In prokaryotic ribosome, one of the binding sites for tRNA is P site which is responsible for ?

asked Apr 3, 2014 by pady_1

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Which amino acids are represented by a single codon ?

asked Apr 3, 2014 by pady_1

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Root hairs absorbs water from soil when

asked Apr 3, 2014 by sreemathi.v

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Dry seeds when placed in water swell up due to

asked Apr 3, 2014 by sreemathi.v

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Which helps in maintaining form and structure of cell?

asked Apr 3, 2014 by sreemathi.v

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Cell turgidity is caused by

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Net movement of water is from

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The external solution having same concentration as that of cell sap is called

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The external solution having more concentration than the cell sap is called

asked Apr 2, 2014 by sreemathi.v

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The membrane that allows some solute molecules to pass through it and prevent others is called

asked Apr 2, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:The roots of transpiring plants is directly proportional to relative humidity}\\\text{Reason:Humid air increases the rate of diffusion so that the rate of transpiration increases}\end{array}$

asked Apr 2, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Most of the water absorbed by the plants is lost by transpiration}\\\text{Reason:Water is not needed for vital activities of plants}\end{array}$

asked Apr 2, 2014 by sreemathi.v

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Distinctive Features of various Phyla: Match the following and choose the most appropriate option:

asked Apr 2, 2014 by pady_1

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Given the Assertion and Reason below, Choose one of the following responses -

asked Apr 2, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses -

asked Apr 2, 2014 by sreemathi.v

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Regarding life cycle of plants and gametophyte : Match the following and choose the most appropriate option:

asked Apr 2, 2014 by pady_1

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Regarding life cycle of plants and sporophyte : Match the following and choose the most appropriate option:

asked Apr 2, 2014 by pady_1

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Regarding Plant life cycle & alternation of generations: Match the following and choose the most appropriate option: (each option on 3 columns can be matched to multiple options on the another 2 columns) eg. A-(iv)-3,5; B-(i); C-(iii)-2; D-(ii),(vi),(vii)-1; (iii),(v)-6;

asked Apr 2, 2014 by pady_1

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Regarding life cycle of a moss : Match the following and choose the most appropriate option:

asked Apr 2, 2014 by pady_1

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Regarding *** organs in bryophytes : Match the following and choose the most appropriate option:

asked Apr 2, 2014 by pady_1

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Light is very important external factor of transpiration}\\\text{Reason:Light induces stomatal opening and darkness stomatal closure.Thus the rate of transpiration increases in light and decreases in dark}\end{array}$

asked Apr 2, 2014 by sreemathi.v

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Match the following and choose the most appropriate option: (each option on 3 columns can be matched to multiple options on the another 2 columns) eg. A-(iv)-3,5; B-(i); C-(iii)-2; D-(ii),(vi),(vii)-1; (iii),(v)-6;

asked Apr 2, 2014 by pady_1

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Regarding Sexual reproduction in Algae - Match the following and choose the most appropriate option: (each option on both columns can be matched to multiple option on the another side ie right or left) eg. A-1,2 ; B,C,D-3 ; A,B,C-3,4

asked Apr 2, 2014 by pady_1

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Match the following and choose the most appropriate option: (each option on both columns can be matched to multiple option on the another side ie right or left) eg. A-1,2 ; B,C,D-3 ; A,B,C-3,4

asked Apr 2, 2014 by pady_1

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Match the following and choose the most appropriate option: (each option on 3 columns can be matched to multiple options on the another 2 columns) eg. A-(iv)-3,5; B-(i)-6; C-(iii)-2; D-(ii),(vi),(vii)-1

asked Apr 2, 2014 by pady_1

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:If a bottle filled with volatile substance is opened at a corner of the room the odour of substance can be smelled from another corner}\\\text{Reason:The volatile substances diffuse from the region of higher concentration to the region of lower concentration}\end{array}$

asked Apr 2, 2014 by sreemathi.v

1 answer

Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:The water molecules are held together from substomatal cavities in leaves to the roots because of cohesive force}\\\text{Reason:Water does not ascend in stem due to transpiration pull}\end{array}$

asked Apr 2, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses

asked Apr 2, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses -

asked Apr 2, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Plasmolysis occurs when the plant cells are highly placed in concentrated sugar or salt solution}\\\text{Reason:Highly concentrated sugar or salt solution acts as hypotonic solution which leads to exosmosis}\end{array}$

asked Apr 2, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:The cells of the root have lower water potential than leaf cells }\\\text{Reason:Root cells have greater solute concentration}\end{array}$

asked Apr 2, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses$\begin{array}{1 1}\text{Assertion:Root pressure is the reason for ascent of sap in herbaceous plants}\\\text{Reason:Root pressure is due to diffusion pressure gradient and is maintained by the activity of living cells}\end{array}$

asked Apr 2, 2014 by sreemathi.v

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Match the items of column I with the appropriate items in column II:

asked Apr 2, 2014 by sreemathi.v

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