Read the following and answer any three questions from $(i)$ to (iv). Heterotrophic nutrition is a mode of nutrition in which organisms obtain readymade organic food from outside sources. The organisms that depend upon outside sources for obtaining organic nutrients are called heterotrophs. Heterotrophic nutrition is of three types: saprophytic, parasitic, and holozoic nutrition.
$(i)$ In which group of organisms is food material broken down outside the body and then absorbed?
(ii) What are heterotrophs?
(iii) $(A)$ Give an example of a saprotroph. $(B)$ Write the three types of heterotrophic nutrition.
(iv) What does heterotrophic nutrition involve?

The partially digested food coming from the stomach of a person enters a long and narrow organ $A$ in his body. The organ $A$ receives the secretion of two glands: liver and pancreas. Liver secretes a greenish-yellow liquid $B$ which is normally stored in the organ $C$. Pancreas secretes pancreatic juice which contains three digestive enzymes $D$, $E$ and $F$. The intestinal juice completes the process of digestion of food. The inner wall of organ $A$ has millions of tiny finger-like projections $G$ which help in the rapid absorption of digested food into the blood stream. The undigested part of food then passes into a wider tube $H$ which absorbs most of the water from the undigested food. The last part of tube $H$ called $I$ stores this undigested food (or waste) for some time. The undigested food is then passed out through opening $J$ as faeces in the process known as $K$.
$(a)$ Name the organ $A$.
$(b)$ Name liquid $B$ and organ $C$.
$(c)$ What are the digestive enzymes $D$, $E$ and $F$?
$(d)$ Name the projections $G$ present on the inner wall of organ $A$.
$(e)$ Name tube $H$, part $I$, opening $J$ and process $K$.

State the difference between nutrition in plants and animals.

Choose the function of the pancreatic juice from the following:

In the following situation, what happens to the rate of photosynthesis?
Cloudy days.

State two functions of stomata.