Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
Which of these characteristics is NOT associated with the evolution of heterospory in pteridophytes?
Reduction in the number of megaspores
Increased protection of the female gametophyte
Development of endosporic gametophytes
Increased dependence on water for fertilization
Which of the following BEST explains why the ascent of sap in tall trees is primarily attributed to the cohesion-tension theory rather than root pressure?
Root pressure only operates during the night
Root pressure is primarily involved in nutrient transport, not water transport
Root pressure alone cannot generate sufficient pressure to overcome the gravitational force in tall trees
The cohesion-tension theory is more energy-efficient than root pressure
One potential disadvantage of amitosis compared to mitosis is:
Slower cell division rate
Increased energy expenditure
Increased risk of unequal distribution of genetic material
Formation of a complex spindle apparatus
Compared to mitosis, amitosis is considered a:
More complex and more regulated process
Less complex and less regulated process
Faster and more efficient process for all cell types
Process producing genetically identical daughter cells
Researchers discover a new plant pigment, 'florigen X,' that they hypothesize is the elusive 'flowering hormone.' Which experiment would provide the STRONGEST evidence for this hypothesis?
Measuring florigen X levels in leaves of plants grown under different light regimes.
Applying purified florigen X to the apical meristem of a non-induced plant and observing flowering.
Demonstrating that florigen X synthesis is regulated by phytochrome.
Grafting a leaf from a photoperiodically induced plant onto a non-induced plant of the same species and observing flowering in the recipient plant.
If the RNA world hypothesis is correct, which of the following would be the MOST likely scenario for the emergence of DNA?
DNA spontaneously arose independent of RNA and eventually outcompeted RNA.
Proteins evolved first and then catalyzed the formation of DNA from RNA.
RNA developed the ability to synthesize deoxyribonucleotides and polymerize them, eventually leading to DNA genomes.
Extraterrestrial DNA was introduced to Earth and replaced RNA.
Which statement is false regarding the role of leaves in photoperiodism?
Leaves contain photoreceptors called phytochromes.
Light perception by leaves is essential for photoperiodism.
Leaves transmit signals related to day length.
Leaves directly induce flowering.
If the respiration losses in an ecosystem exceed the Gross Primary Productivity (GPP), what can be inferred about the Net Primary Productivity (NPP)?
It will be negative.
It will be zero.
It will be positive but low.
It will be equal to GPP.
Assertion: The cork cambium produces the secondary xylem and phloem in dicot stems.
Reason: Secondary growth leads to an increase in the girth of the stem.
Choose the correct option:
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Assertion is correct, but Reason is incorrect
Assertion is incorrect, but Reason is correct
The extrusion of the second polar body is essential for:
(i) Completion of meiosis II
(ii) Maintaining the correct chromosome number in the zygote
(iii) Allowing sperm penetration
(i) only
(i) and (ii)
(ii) and (iii)
(i), (ii), and (iii)
