Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
A researcher applies a potent respiratory inhibitor to the root cells of a plant. Which of the following would be MOST directly affected, ultimately impacting root pressure?
Water potential gradient between the soil and root hairs
Cohesion and adhesion of water molecules in the xylem
Transpiration pull from the leaves
Active transport of ions into the xylem
A plant exhibits vigorous guttation during the night. Which of the following would be the MOST likely consequence of completely sealing the hydathodes with a waterproof sealant without harming the plant otherwise?
A significant decrease in root pressure
A substantial increase in transpiration rate
No change in root pressure or transpiration rate
A slight increase in root pressure
Which combination of factors would MOST effectively reduce transpiration in a xerophytic plant?
Large leaf surface area, numerous stomata, thin cuticle
Sunken stomata, thin cuticle, extensive leaf venation
Sunken stomata, thick cuticle, reduced leaf surface area
Numerous stomata, thick cuticle, large leaf surface area
In a CAM plant experiencing prolonged water stress, which adaptation is MOST likely to minimize the transpiration and photosynthesis compromise?
Increased stomatal density
Further temporal separation of CO2 uptake and fixation
Shifting from CAM to C4 photosynthesis
Reducing leaf surface area
How does the boundary layer resistance affect the transpiration and photosynthesis compromise?
A thicker boundary layer increases transpiration and enhances CO2 diffusion.
A thicker boundary layer reduces transpiration but also limits CO2 diffusion to the leaf surface.
Boundary layer resistance has no impact on either transpiration or CO2 diffusion.
A thinner boundary layer reduces transpiration and limits CO2 diffusion.
Imagine a mutant plant with stomata that are less sensitive to abscisic acid (ABA). Under drought conditions, compared to a wild-type plant, this mutant would MOST likely exhibit:
Lower transpiration rate and higher photosynthetic rate
Higher transpiration rate and lower photosynthetic rate
Lower transpiration rate and lower photosynthetic rate
Higher transpiration rate and higher photosynthetic rate
A scientist is attempting to develop a transgenic crop resistant to a specific lepidopteran pest. Which gene would be the LEAST suitable candidate for transfer?
A gene encoding a Bt toxin
A gene conferring resistance to a bacterial pathogen
A gene involved in photosynthesis
A gene encoding a protein that disrupts insect gut function
A new herbicide-tolerant crop variety has been developed. Which evaluation is MOST crucial before its commercial release, considering potential environmental impact?
Analysis of the nutritional content of the modified crop
Evaluation of the crop's yield compared to traditional varieties
Assessment of gene flow to wild relatives and the development of herbicide resistance in weeds
Study of the effects of the herbicide on non-target insects
A researcher aims to create a transgenic cow that produces human lactoferrin in its milk. Which promoter would be MOST suitable to drive the expression of the human lactoferrin gene in the mammary gland of the cow?
CMV promoter
ฮฒ-actin promoter
ฮฒ-lactoglobulin promoter
Metallothionein promoter
Which of the following is a major ethical concern associated with the production of transgenic animals?
The high cost of producing transgenic animals.
The low success rate of creating transgenic animals.
Animal welfare and the potential for unforeseen health problems in the transgenic animals.
The limited applicability of transgenic animal models to human diseases.
