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

Spirogyra, Volvox, and Chlamydomonas are all examples of green algae.

These organisms are known for containing chlorophyll, the primary pigment for photosynthesis, and are simple, aquatic, and autotrophic. 

Explanation

The tissue found between the upper and lower epidermis of a leaf is known as the mesophyll. 

In most plants, the mesophyll is composed of two distinct layers: 

Palisade mesophyll:

Located just below the upper epidermis, this layer consists of tightly packed, column-shaped cells that are rich in chloroplasts.

It is the primary site of photosynthesis.

Spongy mesophyll:

Located below the palisade layer, this tissue has irregularly shaped cells with large air spaces between them.

These spaces allow for the circulation of carbon dioxide, oxygen, and water vapor. 

Explanation

Centrioles are small organelles found in animal cells that are involved in cell division, but they are not typically found in plant cells. 

Cell wall:

Plant cells have a cell wall, which is a key structural component of their exterior. 

Vacuole:

Plant cells often have a large central vacuole, which plays a role in storing water, nutrients, and waste products. 

Nucleus:

Like all eukaryotic cells, plant cells have a nucleus, which houses the DNA and controls cellular activities. 

Explanation

If photosynthesis were to stop, carbon dioxide would increase and oxygen would decrease in the atmosphere. 

Photosynthesis is the process by which plants use sunlight to convert carbon dioxide and water into oxygen and glucose.

If this process stops, there's no new oxygen being produced, and the carbon dioxide

That plants normally remove from the atmosphere would accumulate. 

Explanation

Based on its characteristics, the plant belongs to the class dicotyledons (or dicots). 

Vein network on leaves:

• Dicots have leaves with a complex, branching, and interconnected vein pattern known as reticulate venation.
• In contrast, monocots typically have parallel venation.

8 petals:

• Dicot flowers most commonly have petals in multiples of four or five.
• Since eight is a multiple of four, it is a strong indicator of a dicot plant.
• Monocot flowers typically have petals in multiples of three. 

Explanation

The main biopolymers that comprise a fungal cell wall are chitin and glucans,

Chitin provides a strong structural network through N-acetylglucosamine units 

Glucans (glucose polymers) cross-link to further strengthen the wall.

Other components, such as mannoproteins, are also present in the outer layer, contributing to the wall's integrity and function. 

Explanation

Most plant viruses have RNA as their genetic material.

Only a few plant viruses contain DNA, but RNA is the majority type.

Explanation

When white light shines on a green leaf, the chlorophyll pigment in the leaf absorbs most wavelengths of light except for green.

The green light is reflected, making the leaf appear green to our eyes. 

Explanation

Apple trees and palm trees are flowering plants, which are classified as angiosperms.

Oaks are also flowering plants producing seeds in fruits, unlike gymnosperms which have naked seeds.