Which statement is correct? a)All organisms that can synthesize their food by means of photosynthesis are heterotrophic.

b)All organisms that cannot synthesize their food by means of photosynthesis or chemosynthesis are heterotrophic.

c)All organisms that cannot synthesize their food by means of photosynthesis are heterotrophic.


Answer 1
Answer: The answer is:

B) All organisms that cannot synthesize their food by means of photosynthesis or chemo synthesis are heterotrophic.


All  those organisms that cannot manufacture their own food and instead obtains its food and energy by taking in organic substances in the process of photosynthesis usually in the animals and plants. All animals, protozoans, fungi, and most bacteria are heterotrophs.

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Valerie designed and conducted an experiment on pothos plants, which are common houseplants. Her hypothesis is that the direction of light will affect the growth pattern of a pothos plant. To test the hypothesis, she sets up two test groups of pothos plants and observes them three weeks later. The table summarizes the test groups and observations. Test Group Growth Conditions Observations 1 Light source is only on the side of the plant Stems and leaves are bent toward the light 2 Light source comes from all directions Stems and leaves are not bent What are the roles of the two test groups in this investigation?


Answer: The roles of two test groups in the investigating a phenomenon known as  positive phototropism. This phenomenon occurs in the plants that responds to external stimuli (light). In this experiment we can see that the pothos plant is having a positive response in both the cases :

1. When the light source is on one side the stems and leaves are bending towards the light source only on one side

2. On the other hand when the pothos plant is given lights from all the directions the growth of the plant takes place in all the directions equally hence it proves that the plant is showing positive responses in the directions where light is present  


Mutations are important for evolution because they


Mutation causes change in an organisms DNA, resulting in a change in all aspects of the organisms life. It affects how the organism looks, and how it behaves. If there was no mutation, an organism could not change, therefore there wouldn't be evolution at all.

Answer: Asthma



When analyzing data,which does the scientist look for


A scientist may look for patterns in the data to identify trends. This helps the scientist predict new outcomes.

Answer: PATTERNS -Gradpoint



All of the following are true statements about meiosis in mammals EXCEPT: It serves as a factor in bringing about variation among offspring. A It follows DNA replication. B It occurs only in reproductive structures. C It produces cells with the haploid number of chromosomes.D It produces four genetically identical gametes.


Meiosis is a reduction division in which the chromosomes are reduced to half when transmitted from the parent to daughter cells.

Meiosis in mammals occurs in the reproductive cells and it does not produce four genetically identical gametes.

Meiosis leads to:

  • Meiosis is a primary factor in variation among the offspring.

  • Meiosis occurs in the reproductive cells and follows the DNA replication process.

  • The diploid parent cells form the haploid daughter cells, which are genetically different from each other leading to diversity among organisms.

  • Meiosis is a crucial part of syngenesis, in which the male and female gametes fuse to form genetically variant offspring.

Thus, the correct answer is Option D.

To know more about meiosis, refer to the following link:

Answer: option D) It produces four genetically identical gametes.


Meiosis DOES NOT produces four (4) genetically identical gametes RATHER four (4) offspring cells that are genetically DISSIMILAR with half of the parent chromosome, due to the exchange of material that occurs between homologous chromosomes during crossing over (a distinguishing feature of meiosis).

This exchange is the basis for variation that is observed among offsprings.

So, all options are true except option D

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