Plant Physiology | MCQs

Explanation

Caffeine occurs naturally in the tea plant,

Camellia sinensis, so all brewed tea contains some caffeine. 

Tea leaves contain 3.5% caffeine,

while

Coffee beans have 1.1–2.2%.

Explanation

All important questions and Information Related to 'Photosynthesis"

Photosynthesis takes place in presence of the following light Only in sunlight from the sun

Photosynthesis takes place faster in white light

Photosynthesis occurs more in blue and red light rays

Photosynthesis occurs more in blue and red light rays and less, or not at all, in green light rays.

Green Light light is more important for photosynthesis.

As compared to photosynthesis, glucose is chiefly decomposed during Respiration

At the time of a Solar Eclipse, the rate of photosynthesis will: Decrease

In all plants, the major sites of photosynthesis are Leaves

In Photosynthesis reduction occurs in the Water

At night, when photosynthesis is stopped, plants Give off Carbon Dioxide.

Photosynthesis pigments are organized into clusters called thylakoid

The process of photosynthesis produces glucose and carbon dioxide

ND2-03-2023

Explanation

According to the pressure flow theory, roots can act as a sink (when storing food) and as a source (when mobilizing stored food).

This dual role depends on the plant’s growth stage and seasonal needs.

Explanation

Glucose synthesis occurs during photosynthesis, which primarily happens in the leaves.

Leaves contain chlorophyll that captures sunlight energy needed for this process.

Explanation

Guttation is the exudation of liquid water droplets from the edges of leaves through special pores called hydathodes.

It usually occurs at night or early morning when soil moisture is high and transpiration is low.

Explanation

Stomata are tiny pores (usually on leaves) that allow gas exchange (CO₂ in for photosynthesis, O₂ out).

They also regulate water vapor release (transpiration).

Explanation

All important questions and Information Related to 'Photosynthesis"

Photosynthesis takes place in presence of the following light Only in sunlight from the sun

Photosynthesis takes place faster in white light

Photosynthesis occurs more in blue and red light rays

Photosynthesis occurs more in blue and red light rays and less, or not at all, in green light rays.

Green Light light is more important for photosynthesis.

As compared to photosynthesis, glucose is chiefly decomposed during Respiration

At the time of a Solar Eclipse, the rate of photosynthesis will: Decrease

In all plants, the major sites of photosynthesis are Leaves

In Photosynthesis reduction occurs in the Water

At night, when photosynthesis is stopped, plants Give off Carbon Dioxide.

Photosynthesis pigments are organized into clusters called thylakoid

The process of photosynthesis produces glucose and carbon dioxide

ND2-03-2023

Explanation

Cobalt chloride paper is used to detect moisture; it turns from blue to pink in the presence of water vapor.

This change helps demonstrate transpiration as water evaporates from the leaf surface.

Explanation

The correct chemical equation for photosynthesis is:

6CO₂ + 6H₂O → sunlight/chlorophyll C₆H₁₂O₆ + 6O₂

This equation shows that carbon dioxide and water are converted into glucose and oxygen in the presence of sunlight and chlorophyll.

Explanation

Oxygen is a byproduct of photosynthesis, not a required factor for the process.

Light, carbon dioxide, and chlorophyll are essential for photosynthesis to occur.