<u>Answer</u> : The structure labelled F is a central vacuole. It performs the following functions in a plant cell -
1. It accumulates the waste product generated by plant cell.
2. It maintains the shape and turgidity of a plant cell.
Since, the animal cells <em>lack a cell wall</em> the turgid pressure maintained by the central vacuole would cause the animal cell to burst. Thus, the animal cells lack a central vacuole as they do not need to maintain a high turgid pressure provided by the vacuole.
<u>Explanation</u>:
- Most of the mature plant cells have a single large vacuole which can occupy upto 80% of the cell’s volume.
- The vacuole is surrounded by a membrane called as tonoplast.
- One of the main functions of the vacuole is to maintain <em>turgor</em> <em>pressure</em> in the plant cell.
- The turgor pressure is exerted against the cell wall and is important to maintain the cell shape, for cell elongation and keep the chloroplast closer to light by exerting pressure on the cell organelles and pushing them towards the periphery.
Prokaryotes cells like germs
Answer:
The pattern of branching in a phylogenetic tree reflects how species or other groups evolved from a series of common ancestors. In trees, two species are more related if they have a more recent common ancestor and less related if they have a less recent common ancestor.
Answer: Hypothalamus
Explanation:
The hypothalamus, located in the fore brain is the important part of the brain that controls the secretion of the pituitary gland. It does this by stimulating the anterior pituitary gland to secrete its hormone, ACTH (Adrenocorticotropic hormone) which in turns stimulates the adrenal cortex to release corticosteriods that helps in fluid and salt balance in the body.
Thus, professor petrol's colleague is focusing on the hypothalamus.
Well lets see.... People who receive an artificial heart can either live a long healthy live or the heart might reject the blood and cells that are going into it resulting in serious health problems or even worse death. It all really depends on the heart and how it is going to react in the patients body.
