Explanation:
The lac operon
When lactose is present, bacteria need the enzymes to break it down. But if no lactose is present, bacteria do not need to waste resources making enzymes to break down a sugar that isn't there. Like a switch, the operon is turned on when the enzymes are needed.
b. heterotrophs.
c. thylakoids.
d. plants.
Answer: Heterotrophs
Explanation:
Organism that cannot make their own food and depends on the external sources for its energy are known as the heterotrophs.
They are dependent on the other organisms for their energy. They feed on the plants or animals for their energy.
Other than plants all the other organisms are dependent on food from other sources as they lack the ability to make food by their own.
Heterotrophs are the organisms that feed on other organisms to get energy to survive. Option B, Heterotrophs.
Organisms are classified into autotrophs and heterotrophs depending on how they get energy.
Heterotrophs need to feed on other organisms to get the necessary energy to survive. They do not produce their own food as producers do.
Depending on the food chain, heterotrophs might be either primary, secondary, tertiary consumers, and so on.
Also, depending on their source of food, they might be either herbivores (if they feed on plants) or carnivores (if they feed on animals). Omnivores can feed either on plants or animals.
In the exposed example, the organisms that cannot make their own food and must obtain energy from external sources are called heterotrophs.
The correct option is b. Heterotrophs
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B. IB
C. dual enrollment
D. AP
Answer:
Option B, Xylem --> phloem --> endodermis --> stele --> epidermis --> cortex --> cambium ///
Explanation:
The start of water transportation via roots takes place through the Xylem as these are the specialized cell in roots to intake water from the ground. These cells are arranged in the form of layer and filters the water before transporting. After the filtration in Xylem, water then passes to phloem (which are also part of conducting system of plants and runs parallel to the xylem). After the phloem, water then goes to the central part of the root which is known as stele and then it reaches the epidermis. From epidermis , absorbed water then goes to the cortex of other tissues and organ and finally it reaches the cambium.
Hence, option B is correct