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sergiy2304 [10]
3 years ago
11

Differences between hilum and micropyle​

Chemistry
1 answer:
Alik [6]3 years ago
5 0
Hilum is a scar on a seed that shows the connection between the ovule and ovary while micropyle is a pore that shows the point from which the pollen tube entered the ovary during fertilization. So, this is the key difference between hilum and micropyle
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Order the theories from oldest to most recent.
rjkz [21]

Answer:

Explanation:

The following are the order of point from oldest to most recent

1. Atoms are tiny indivisible particles that make up all mater.

it is Postulate of Dalton's atomic theory. this theory was put forward in 1803

2.  Negatively charged electrons are embedded in a mass of positive charge.

In 1897 J.J Thomson discovered that atom consist of tiny negatively charged particles called electrons that are uniformly spread in +vely charged matrix this model called as plum pudding model.

3. Atoms consist of mostly empty space with a dense nucleus of positive charge.

While doing experiment on gold foil Rutherford presented a model in 1909 and stated that atom consist mostly empty space with dense nucleus.

4. Electrons occupy specific energy levels surrounding a positively charged nucleus.

Niels Bohr in 1913 put forward a model to explain atomic orbitals/energy level. This is a postulate of Bohr model.

5. Electrons move about a positively charged nucleus in clouds that are defined by probabilities.

In 1926 Erwin Schrödinger explain the wave function of electrons and its probability.

5 0
3 years ago
Energy does not have to involve motion.<br> Question 8 options:<br> True<br> False
liraira [26]
False.Energy does not involve motion
4 0
3 years ago
You and your lab partner are asked to determine the density of an aluminum bar. The mass is known accurately to 4 significant fi
zmey [24]

Answer:

Average density for method A = 2.4 g/cm³

Average density for method B = 2.605 g/cm³

Explanation:

In order to calculate the average density for each method, we need to add the data for each method, and then divide the result by the number of measurements (in this case is 4 for both methods):

  • For Method A:

Σ = 2.2 + 2.3 + 2.7 + 2.4 = 9.6

Average = 9.6/4 = 2.4 g/cm³

  • For Method B:

Σ = 2.603 + 2.601 + 2.605 + 2.611 = 10.420

Average = 10.420/4 = 2.605 g/cm³

5 0
3 years ago
Why would someone need to find the relative density of an object?
Ede4ka [16]

Answer:

The relative densities of an object and the liquid it is placed in determine whether that object will sink or float. An object that has a higher density than the liquid it's in will sink. An object that has a lower density than the liquid it's in will float.

Explanation:

Hope it helps!

8 0
2 years ago
Question 5 of 10
OverLord2011 [107]

Answer:

4.2  g  

Explanation:

The VOLUME of the ring is   4.2 - 4.0 = .2 ml  = .2 cm^3

the MASS of the ring is this times the density

.2 cm^3  *  21 g/cm^3 = 4.2 g

4 0
2 years ago
Read 2 more answers
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