List of top Botany Questions

In the chromatin the charge of a DNA and associated proteins, the number of types of histones and copies are
A. Positive, Negative
B. Negative, Positive
C. 4.2
D. 16.4
Name the cell organelle which are involved in the following processes
A. Conversion of stored lipids to carbohydrates
B. Catabolism of long chain fatty acids
The anatomical characteristic features of hydrophytes are
Polyarch and tetrarch vascular bundles generally occur in these
The introduction of nematode-specific genes into host using Agrobacterium vectors causes the following action:
I. Formation of dsRNA.
II. Production of sense and antisense RNAs in the host cells.
III. RNA intermediate not formed.
IV. Silencing of specific mRNA of the nematode.
Assertion (A): Methanogens are present in the rumen of cattle.
Reason (R): They help in the breakdown of cellulose and nutrition of cattle.

Match the following

The below reaction is catalyzed by the enzyme:
$CO_{2}$ + $H_{2}$O → $H_{2}CO_{3}$
A person suffering from Iodine deficiency may be recommended to take extracts of this plant preparation.
Amphitrichous bacteria contain flagella like this:
Match the following:
List I (Organism/Enzyme)List II (Product/Use)
I. Aspergillus niger D. Citric acid
II. Clostridium butylicumC. Butyric acid
III. LipaseA. Detergent formulation
IV. SaccharomycesB. Ethanol
Correct sequence of the development process in a plant cell
Find the correct matching
A) Carrot -- Flowers appear from the same point of peduncle
B) Cocos -- Flowers protected by the modified bract
C) Achyranthes -- Flowers appear in the varied lengths of pedicels
D) Cassia -- Flowers appear on the flattened peduncle
Assertion (A): Infectious agents can be passed through the filter.
Reason (R): This filterable agent is responsible for disease.
From the following choose the correct statement related to mutations
The compounds produced when RuBP reacts with O$_2$ are
Fusion between two similar gametes, two dissimilar gametes, and non-motile and motile gametes occurs in these organisms respectively.
Name and arrange the following in the order of technique and steps for separation and isolation of DNA fragments:
[I.] DNA fragments moved towards anode under electric field
[II.] Exposure to UV radiation
[III.] DNA fragments stained with EtBr (Ethidium Bromide)
[IV.] Gel electrophoresis
[V.] Elution
The following plant is characterized by trimerous flowers, superior and trilocular ovary with axile placentation.
Heterozygous tall plants were crossed with dwarf plants. Then the percentage of dwarf plants produced in the next progeny is:
In a dorsiventral leaf, the position of xylem
The metal ions required for the association of the two subunits of the prokaryotic ribosomes

Match the following

Which of the following is true about Gibberellins?
A. Gibberellins are terpenoid compounds, made up of isoprene units.
B. GA12 is the precursor of all the other gibberellins.
C. GA1 and GA3 are directly responsible for the various effects in plants.
D. Size of seedless grapes can be increased by GA applications.
E. Gibberellin biosynthesis can be inhibited by application of Auxins.
Choose the correct answer from the options given below:
The length of a double helical DNA molecule is 13.6 km. If the DNA double helix weighs $1 \times 10^{-18}$ g per 1000 nucleotide pairs and rise per base pair is 3.4 Å, then weight of the double helical DNA molecule (in nanogram) will be _______ (in integer).