1. A cauliflower
2. D multicellular or unicellular heterotrophic eukaryotes...
3. D archaebacteria
4. B decompose organic waste
5. C multicellular, eukaryotic, heterotrophic.
Explanation:
1. Only photosynthesizing organisms have chloroplasts. Photosynthesizing organisms are usually restricted to green plants and some bacteria that undergo photosynthesis. However, the answer cannot be D, because bacteria do not have membrane-bound organelles such as chloroplasts.
Green tree frogs are animals, which cannot photosynthesize, and mushrooms are fungi which cannot photosynthesize. Therefore, the answer has to be A, cauliflower, which are green plants and hence make their own food by photosynthesis.
2. Â Fungi are eukaryotic organisms that can be both unicellular or multicellular. Therefore, B cannot be correct. They do not obtain their energy from sunlight; this describes the process of photosynthesis which fungi do not carry out. Therefore, the answer cannot be B.
Fungi are often heterotrophic, which means they get their energy from other sources and cannot synthesise their own food. Therefore, C cannor be right. However, they do not eat other organisms, instead, they get their nutrition by absorbing  nutrients from the environment.
3. Archaebacteria, or archaea, are a distinct domain of organisms that are highly dissimilar to other classified eukaryotes and prokaryotes, but share some similar characteristics to prokaryotes.
They are distinct because they are genetically very different to "new" bacteria, and scientists gave them a different classification. Their biochemistry is very distinct, and they are able to survive in very harsh environments such as sulfur-rich deep sea vents.
4. All living things have DNA, so C cannot be correct. Fungi and plants both have cell walls, so D cannot be correct. Both fungi and plants also secrete enzymes. Therefore, the answer must be B.
This is correct, because plants synthesise their own food via photosynthesis. In contrast, fungi use nutrients found in their environment to make energy to carry out cellular processes. These nutrients come from animal and plant matter.
5. Animals are always multicellular, therefore A and B cannot be correct. All animals also belong to the eukaryote classification of life.
Animals also consume food from plants and animal matter to obtain energy rather than synthesising their own food like plants do, using light energy from the sun. Â This means animals are heterotrophic, not autotrophic like plants. This means the correct answer is C.
