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Anit [1.1K]
3 years ago
5

Ort-Answer QuestionsHow can you say that cutting of paper is a physical change?​

Biology
1 answer:
Andreas93 [3]3 years ago
6 0

Answer:

Physical change means that only the form / shape of the substance is changed , not the chemical properties. So here, cutting of paper is a physical change since it's shape is changed but the chemical properties remain the same.

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what are some advantages and disadvantages of using permanent slides as opposed to temporary slides to view tiny aquatic animals
nikitadnepr [17]

Answer:

Permanent slides ensures preservation of the body parts of the tiny aquatic animals and also also aids good visualization.Most of the exoskeleton of   these tiny   animals are lost during temporary slides preparation, thus loss of visualization.

Because the animals are transfixed to a point, their body parts can not be moved.

It also saves time, energy and resources spent during observation.

However,because of dehydration during preparation  their natural color may be lost which may affect observation of natural features

Explanation:

3 0
2 years ago
1.Write the equation for light dependent reaction of photosynthesis
Annette [7]

Answer:

1. The overall chemical equation of the light-dependent reactions is given below:

12 H₂O + 12 NADP+ + 18 ADP + 18 Pi + light and chlorophyll ----> 6 O₂ + 12 NADPH + 18 ATP

2. The overall chemical equation for the light-independent reactions of the Calvin cycle is given below :

3 CO₂+ 6 NADPH + 5 H₂O + 9 ATP → glyceraldehyde-3-phosphate (G3P) + 2 H+ + 6 NADP+ + 9 ADP + 8 Pi

Explanation:

1. The light-dependent reactions convert light energy into chemical energy, producing ATP and NADPH which are used light-independent reactions to drive the synthesis of sugar molecules from inorganic CO₂ and water. Light-dependent reactions takes place in photosystem I and II. Photosystem I and Photosystem II ( PS I and PS II) are the two biochemical systems, active in chloroplasts, that serve as sites of electron transfer reactions in photosynthesis. Energy from sunlight is used to split water which releases electrons and hydrogen atoms which are transferred to NADP+ to produce ATP and NADPH and oxygen is produced as a waste product.

The overall chemical equation of the light-dependent reactions is given below:

12 H₂O + 12 NADP+ + 18 ADP + 18 Pi + light and chlorophyll ----> 6 O₂ + 12 NADPH + 18 ATP. Note that Pi refers to inorganic phosphate

2. The Calvin cycle refers to the light-independent reactions in photosynthesis. It occurs in three stages.

Stage 1 (Carbon fixation): In this first stage of the Calvin cycle, light-independent CO₂ is fixed by enzyme called ribulose bisphosphate carboxylase (RuBisCO) to ribulose bisphosphate (RuBP) to form glyceraldehyde-3-phosphate.

Stage2: ATP and NADPH are used to reduce 3-phosphoglycerate (3-PGA) into glyceraldehyde--phosphate (G3P). ATP and NADPH are used up in the process and are converted to ADP and NADP+, respectively.

Third stage: RuBP is regenerated, which enables the system to prepare for more CO2 to be fixed.

The overall chemical equation for the light-independent reactions of the Calvin cycle is given below :

3 CO₂+ 6 NADPH + 5 H₂O + 9 ATP → glyceraldehyde-3-phosphate (G3P) + 2 H+ + 6 NADP+ + 9 ADP + 8 Pi

6 0
3 years ago
B. Do you think sand or silt is alive?
Fed [463]

Answer:

No I don't think sand or silt is alive because it's not breathing its not an organism.

5 0
3 years ago
Alveoli are the terminal air sacs of the lungs, and are the sites of gas exchange between the lungs and blood. How does the surf
anygoal [31]
<span>Alveoli are specifically designed to quickly facilitate the exchange of gas from the lungs to the blood. They are very small, but with a very high surface area allowing a greater amount of gases to be exchanged in a comparatively short period of time.</span>
3 0
3 years ago
What is the difference between plant cell and animal cell​
Genrish500 [490]

Answer:

Major structural differences between a plant and an animal cell include: <u>Plant cells have a cell wall, but animal cells do not. Cell walls provide support and give shape to plants. Plant cells have chloroplasts, but animal cells do not.</u>

Explanation:

Hope that helps :)

8 0
2 years ago
Read 2 more answers
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