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nirvana33 [79]
2 years ago
7

Describe the role of the double fertilisation in angiosperm reproduction

Biology
1 answer:
Vika [28.1K]2 years ago
3 0

Hey there~

Double fertilization gives rise to an endosperm that provides nourishment to the developing embryo. It increases the viability of the seeds of angiosperms. It utilizes both the male gametes produced by the pollen grains.

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Under which conditions do most types of cells function at optimal levels
Scrat [10]

Explanation:

Cells maintain a constant internal environment; this process called homeostasis, ensures that cells obtain an optimal environment in which they can best function.

The endocrine system involves chemical signalling via the secretion of molecules called hormones into extracellular fluid. They bind to chemical receptors in order to cause specific changes in target cells, these lead to changes in the body's internal environment called homeostasis.

It includes the thyroid, parathyroid, pituitary, pineal and adrenal glands along with other regions. The bone, adipose tissue, heart, pancreas and liver are a few of the regions of the body which show endocrine function. The brain, or control center functions to receive and process the information from the receptor. Effectors receive the control center's command and illicits a response in the form of a feedback loop, that may oppose or enhance the stimulus.

Further Explanation:

During homeostasis the body maintains a constant internal balance in pH, temperature, blood pressure etc. Cells in a multicellular organism become specialized for particular tasks and communicate with one another in order to maintain homeostasis. Within the human body these are known as hormone cascades, where several complex steps occur- the tissues signal to one another with the use of hormones released by the endocrine system. The regulation (increase and decrease) of these secretions is achieved by negative feedback loops, where the release of certain substances during a cascade in turn halts the secretion of hormones at earlier stages.

For example, cells within the human body function at an optimal temperature between 97°F (36.1°C)  and 99°F (37.2°C). This is due to the optimal temperature requirement of the enzymes within the human body, which requires this specific range to obtain activation energy.

Learn more about tissue types at brainly.com/question/8487952

Learn more about homeostasis at brainly.com/question/1601808

#LearnWithBrainly

6 0
3 years ago
In an angular unconformity, the eroded rock is tilted or folded. True False
Vika [28.1K]
I think that that is true
5 0
3 years ago
Read 2 more answers
Which of the following catecholamine hormones correspond with the adrenal glands?
Wittaler [7]

Answer:

Dopamine

Explanation:

Dopamine receptors type 2 (D2) are expressed in the adrenal glands. More so, dopamine helps in the modulation of aldosterone and catecholamine secretion from the adrenal gland.

4 0
3 years ago
Is the protective outer layer of a virus called the "capsid"? <br><br> True <br> or<br> False
mr_godi [17]
The answer is true Hope this helps you
5 0
3 years ago
How much of the organisms that lived on Earth do scientists believe are represented by the fossil record?
Nimfa-mama [501]

Answer:

2%

Explanation:

The scientist believe that around 2% of the species that existed on Earth have been preserved in the fossil records. It is still a hot debate about it though, as there are only around 250,000 species identified in the fossil records so far, which is less than a quarter from the species that live in the present.

The reason why scientists believe that the majority of the species have not been preserved are very logical though. One of the reasons is that lot of species existed very long time ago, so their remains just didn't lasted so long. Other reason is the movement of the plates, where we have situation where plates that existed in the past have been totally suducted and melted in the mantle, while others are at the verge of it, so every fossil with them is melted and destroyed too. Another reason is that lot of species do not have hard parts, solid bone structure, so their preservation has been pretty much impossible,

8 0
3 years ago
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