DNA is a
A. lipid

B. nucleic acid

C. carbohydrate

D. protein

Answer:

a. There were starch in the leaves at the end of two days in the cupboard because there was no sunlight to provide the energy for photosynthesis in the dark cupboard. Also, any previously synthesized starch in the plant leaves were used by the plant for its own metabolic requirements during the period the plant was in the cupboard. Therefore, staying in the cupboard for two days destarched the leaves.

b. The purpose of sodium hydroxide put under bell jar in D is to remove any carbon dioxide that may be present under the bell jar. This is to demonstrate that even in the presence of sunlight, carbon dioxide is required for photosynthesis to occur in plants.

Explanation:

Photosythesis is the process by which green plants manufacture their food (carbohydrates which are stored as starch) in the presence of sunlight. The site of photosynthesis in plants is the leaves.

The experimental design is to study the conditions necessary for photosynthesis to occur. For photosynthesis to occur, there must be presence of sunlight, carbon dioxide and water. Carbon dioxide and water serve as the raw materials for photosynthesis while the energy required is provided by sunlight.

The answers to the observations from the experiment are given below :

a. There were starch in the leaves at the end of two days in the cupboard because there was no sunlight to provide the energy for photosynthesis in the dark cupboard. Also, any previously synthesized starch in the plant leaves were used by the plant for its own metabolic requirements during the period the plant was in the cupboard. Therefore, staying in the cupboard for two days destarched the leaves.

b. The purpose of sodium hydroxide put under bell jar in D is to remove any carbon dioxide that may be present under the bell jar. This is to demonstrate that even in the presence of sunlight, carbon dioxide is required for photosynthesis to occur in plants.

Answer:

The answer is most definitely the second option or "B". This is because, how you think you grow fingernails, or skin over a wound.

The answer is 2nd option ,full grown organisms need to replace aging and damaged cells

Complete question:

Which of the following statements is NOT correct about the flatworms?

A. There are three complete tissue layers.

B. Flatworms may be either free-living or parasitic.

C. Flatworms have a sac body plan, with only a mouth and no anus.

D. Parasitic flatworms have a well-developed head with eyespots and nerves concentrated into a brain.

E. Most planaria are found in marine environments, but some dwell in freshwater and moist terrestrial environments.

Answer:

D. Parasitic flatworms have a well-developed head with eyespots and nerves concentrated into a brain.

Explanation:

Flatworms are inferior organisms, meaning that they do not have nerves concentrated in a brain. Their nervous system is, in general, composed of nerve cords forming a net. The arrangement depends on each of the groups. They have one or more pairs of primitive eyes, which function is to find the light. These eyes cup-shaped and are composed of pigmentary cells.

Flatworms have bilateral symmetry. Their body is plane dorsoventrally and can be divided into two specular halves by the sagittal plane. This plane crosses through the body from the anterior extreme to the posterior extreme. The frontal plane divides the body into two different halves, the ventral one with the mouth and the dorsal one.

These organisms only have one opening in their bodies directed to the digestive system, which is the mouth.

Flatworms are aquatic and, most of them are marine animals, although there can be a few groups that inhabit freshwater. Some species might even be terrestrial. Most of them are free-living organisms, but there are also some parasitic forms.

Answer:

a primary oocyte contains 46 chromosomes, while a secundary oocyte contains 23 chromosomes

Answer:

D. Fungi are autotrophs

Explanation:

Fungi are autotrophs is a FALSE statement about fungi. Fungi are heterotrophs.

Answer:

b) meiosis

Explanation:

Answer:

B. Meiosis

Explanation:

Meiosis involves two DNA divisions.

Answer: Most autotrophs use a process called photosynthesis to make their food. In photosynthesis, autotrophs use energy from the sun to convert water from the soil and carbon dioxide from the air into a nutrient called glucose.

Explanation:

Answer:

Most autotrophs use a process called photosynthesis to make their food. In photosynthesis, autotrophs use energy from the sun to convert water from the soil and carbon dioxide from the air into a nutrient called glucose. Glucose is a type of sugar. The glucose gives plants energy.

hope it helps

Answer:

adding a catalyst will increase the rate of a chemical reaction  

Answer:

The answer is fungi.

Answer:

B. Meiosis

Explanation:

The meiosis produces genetically different cells.

Answer: A

Explanation:

Answer:

A, Resting in the shade

Explanation:

100% Correct, A p e x

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Answer: positive sodium ions

Explanation:

This relates to the Action Potential which is what a nerve cell goes through when it needs to send information down the nerve cell to another cell and so on till it gets to the destination of the message.

The information is transmitted when the segments of the axon fire and when they do, positive sodium ions come in from outside the cell to the inside thereby making the inside positive. The previous segment would return to a resting potential when potassium ions which are negative, rush into the cell.

Answer:

Some EM radiation is absorbed by the atmosphere

Explanation:

Answer:

Farming can lead to the loss of natural habitats.This is destroying natural habitats and changing the very nature and look of our rural landscape.

hope it helps

It is difficult to farm in an incline landscape because initial cost is high,  high operational  cost,  Limited crops can be grown. Thus,  due to these following reason,  inclined farming becomes difficult.

Vertical farming is a practice of growing crops on a hilly or incline land.

However, it may have some disadvantages like high operational cost,  high labor cost,  only a limited number of crops can be grown.

Hence,  due to  these reason, tilted farming is difficult.

Learn more about vertical farming

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Answer:

sun and electric heater

Explanation:

sun is the biggest source of heat energy

electric heater is also an example of heat energy as it warms us

1. A cup of fresh coffee is very hot because the water particles are vibrating very rapidly giving the coffee heat energy.

2. A fire is a chemical reaction that is releasing energy as bonds are being broken, this energy is felt as warm or hot and is a release of heat energy.

Answer:

You can simply define the cell wall as a semi-rigid thick protective structure that surrounds the cell membrane of some types of cells for protection and defining the shape of the cell. The cell membrane alone cannot provide the required rigidity or strength. All living organisms are composed of cells.

Answer:

3' GGACTTAA 5'

Explanation:

because Adenine always pair with Thymine and Cytosine with guanine. u can also remember them as Apple Tree and Car Garage

Explanation:

is there a graph to be shown

Answer:

A. Ancient bacteria

Explanation:

From the salt of the earth, researchers have isolated and revived a Bacillus strain, which they believe is >250 million years old. If correct, Russell Vreeland and his colleagues from West Chester University, Pennsylvania, have discovered the oldest living organism in the world.

Answer:

A. Ancient bacteria

Explanation:

Archae bacteria means ancient bacteria. So, option (A) is the correct answer.

im hispanic but put it in english and then i could help you for sure i promise ill edit my answer and everything solo pongalo en ingles por favor

Answer:

83hrhiddtifrd of r

Explanation:

hsejrndbhsuia b rb

Answer:

75% brown 25 % green....m

Answer:

1977 is when people first knew about archaebacteria

Answer:

it was actually discovered in 1922

they didnt know what it actually was until 1977.

C.1977

Explanation:

Answer:

C. El sistema respiratorio.

Explicación:

El sistema respiratorio es un tipo de sistema en el que los animales toman del medio ambiente los materiales necesarios para sus actividades vitales. Los pulmones son el órgano principal del sistema respiratorio en el que el gas de oxígeno entra al cuerpo y se almacena en los pulmones a través de la inhalación. La hemoglobina que extrae el gas de dióxido de carbono de la célula lo desecha en los pulmones y carga el oxígeno necesario para el proceso de respiración. El dióxido de carbono se elimina de los pulmones mediante la exhalación.

Answer:

B. Their cells have a nucleus.

Explanation:

Protists are eukaryotes, which means their cells have a nucleus and other membrane-bound organelles. Most, but not all, protists are single-celled.

Answer:

The answer is B their cells have a nucleus

Explanation:

I took this question on an assignment got it correct!

Answer:

A. identical

Explanation:

because it is replicating meaning it is going to look the same and be identical.