During the course of an experiment to determine the percentage of water absorbed by raisins, when should the raisins be weighed?

In photosynthesis, which substances are used up, which are produced, and which are necessary but remain unchanged after the reaction? Identify the correct row from the table below:

Option	Used up	Produced	Remain unchanged
$(a)$	$CO_2, H_2O$	$Glucose, O_2$	$Chlorophyll$
$(b)$	$Chlorophyll$	$CO_2, H_2O$	$Glucose$
$(c)$	$O_2, Glucose$	$Starch$	$Cellulose$
$(d)$	$H_2O, O_2$	$Glucose$	$Chlorophyll$

The diagram represents a cross-section of the small intestine. What is the role of the structure labelled $X$?

State two functions of stomata.

The pancreas is made up of two parts $A$ and $B$. The part $A$ secretes insulin whereas part $B$ secretes pancreatic juice. $(a)$ Which part is functioning as an endocrine gland? Why? $(b)$ What is insulin and what effect does it have in the body? $(c)$ Name the disease which can be treated by giving insulin injection. $(d)$ What does pancreatic juice contain? Where does pancreatic juice go? $(e)$ Name the life process in which pancreatic juice is made use of.

How do desert plants perform the photosynthesis process even though their stomata remain closed during the daytime?