List of top Botany Questions

A student has identified certain fungi given below and classified under this number of classes. Mucor, Claviceps, Puccinia, Albugo, Neurospora
These are having the ability to replicate within the bacterial cell, independent of control of chromosomal DNA.
Identify the correct combination.
A. Agrobacterium tumefaciens – vector for transgenic plant.
B. Escherichia coli – selectable marker.
C.Thermus aquaticus – Taq polymerase.
D.Bacillus thuringiensis – BT. Toxin.
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.
Choose the wrong pair corresponding to selection of transformed cells
Ganga Action Plan in India is implemented by
Assertion (A): Trichoderma polysporum produces cyclosporin A, an immunosuppressive agent.
Reason (R): It is used in organ transplant patients.
Among the following, mention diseases that have existed in the past but are now showing incidence in new geographical areas.
Assertion (A): Loss or gain of a segment of DNA results in alteration in chromosomes.
Reason (R): Alterations in chromosomes do not result in abnormalities.
Genotype of dominant trait of plant can be determined by crossing $F_{1}$ hybrid with the parent and the genotypic ratio is
Assertion (A): Epidermis of hydrophytes is useful for absorption and assimilation.
Reason (R): In hydrophytes, epidermal cells are devoid of cuticle and contain chloroplasts.
At the end of translation, the release factor binds to this codon to complete polypeptide from the ribosome
Give the nucleotide sequence in the mRNA for this sequence of amino acids given below
Met – Phe – Arg – Gly – Phe
Assertion (A): Beggiatoa changes its shape.
Reason (R): Some bacteria change their shapes depending upon the type of environment.
Free-living microorganisms that feed on organic detritus and an example
Choose the incorrect statement with reference to the cyclic electron transport
Identify the correct pair of aerobic and anaerobic nitrogen-fixing bacteria respectively
In the above reaction, a and b are
$2NH_{3} + 3O_{2}$ → a + $2NO_{2} + O_{2}$ → b → $2NO_{3}$
Following is not applicable in terms of plant-water relations, if a seed is soaked in water
Choose the correct statements
a. Inability of seed germination due to immature embryo is called Quiescence.
b. Seed coats of Fabaceae do not absorb $O_{2}$ and $H_{2}O$.
c. Germination of tomato seeds is inhibited by chemical compounds.
d. Seeds of polygonum require exposure to low temperature.
Identify the correct statement about fermentation.
Arrange the following in a sequence in primary succession in water:
A: Sedges and grasses
B: Trees
C: Phytoplankton
D: Free floating plants
Select the correct statement regarding the cell membrane from the following
In plants, sugar synthesis takes place in
The below reaction is catalyzed by the enzyme:
$CO_{2}$ + $H_{2}$O → $H_{2}CO_{3}$