The correct answer is option (d) They allow the exchange of gases between cells in the leaf and the external environment.
Stomata are the tiny openings present in the epidermis (outer layer of cells) of the leaf. They have a pore which is guarded by the guard cells which controls the opening and closing of the stomata. Air enters and exits through the stomata.
The main funtion of stomata is to facilitate the gaseous exchange. The gas exchange that occurs when the stomata are open helps in the process of photosynthesis. During photosynthesis, carbon dioxide is taken in from the atmosphere and oxygen is released as a by-product of photosynthesis. The glucose produced is converted into the starch and stored in the leaves.
Also, water vapour diffuses through the stomata into the atmosphere by a process called the transpiration.
Thus, stomata are the structures that are mainly involved in the gaseous exchange between the cells of the leaf and the atmosphere.
Answer:
Charles Darwin and Alfred Russel Wallace
Answer:
Answer and Explanation: Three codons are needed to specify three amino acids. Codons can be described as messengers that are on the messenger RNA (mRNA). It is a sequence of three nucleotides that code for one specific amino acid; therefore, every three nucleotides represent one codon.
Explanation:
Answer:
1. They grow faster.
2. They are larger.
3. They are disease free.
This trait can be passed from one generation to another in that by breeding and inbreeding.
Sheep is a ruminant animal which is kept as a livestock. They are members of Artiodactyla.
They have deeply entrenched place in human culture.
Sheep is associated with pastoral and arcadian imagery. They were used as sacrificial animals in ancient religious.
Explanation:
