Q2 of 41 Page 207

The diagram given below shows the human excretory system.


Identify the function of part labelled as x

The labeled part is the urinary bladder, which is a pear-shaped muscular sac composed of smooth muscle. It is connected to the kidneys via ureters. It is meant for storing urine until it is released out through urethra.

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15

Rohan studied excretion in plants. He observed that the oxygen we breathe is actually a waste product of photosynthesis in plants. He wondered about other waste products and their uses. He was also bothered about the increased deforestation which disturbs the O2-CO2 balance of the environment. Read the above passage and answer the questions following.

(i) How do plants release gaseous wastes from their body?


(ii) Apart from oxygen, what other waste products are released by plants? Give two examples along with their use.

 1

Observe the figure given below which represents the control of water concentration in the blood.


This is a negative feedback

 3

In the figure given below the structures associated with human kidneys are marked (X,Y and Z). The relative concentrations of urea in these structure is

 4

The diagram given below represents the liver, kidney and some associated blood vessels. Identify the vessel from the labelled parts A-D in which the blood will contain the lowest concentration of urea?