Question
  1. Define excretion.
  2. Name the basic filtration unit present in the kidney.
  3. Draw excretory system in human beings and label the following organs of excretory system which perform following functions:
  1. Form urine.
  2. Is a long tube which collects urine from kidney.
  3. Store urine until it is passed out.

Answer

  1. Excretion is the process of removal of harmful and unwanted substances, especially nitrogenous wastes, from the body.
  2. Nephron is the basic filtration unit of the kidneys.
  3.  
  1. Kidneys: Form urine.
  2. Ureter: Long tube which collects urine from the kidney.
  3. Urinary bladder: Stores urine until it is passed out.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Which element has:
  1. Two shells, both of which are completely filled with electrons?
  2. The electronic configuration 2, 8, 2?
  3. A total of three shells, with four electrons in its valence shell?
  4. A total of two shells, with three electrons in its valence shell?
  5. Twice as many electrons in its second shell as its first shell?
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide.
  1. Where in the periodic table are elements X and Y placed?
  2. Classify X and Y as metal (s), non-metal (s) or metalloid (s)
  3. What will be the nature of oxide of element Y? Identify the nature of bonding in the compound formed.
  4. Draw the electron dot structure of the divalent halide.
Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka - aluminium, and eka - silicon.
  1. Name the element which has taken the place of (i) eka - aluminium, and (ii) eka - silicon.
  2. Mention the period/ periods of these elements in the modern periodic table.
  3. Write the group/ groups of these elements in the modern periodic table.
  4. Classify these elements as metals, non - metals or metalloids.
  5. How many valence electrons are present in the atoms of each of these elements?​​​​​​
Explain the trends in the Modern Periodic Table of various properties like valency, atomic size, metallic and non-mettalic properties of the atoms of elements.
One half of a convex lens of focal length 10cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30cm from the lens? Draw a ray diagram to justify your answer.
A 4cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20cm. The distance of the object from the lens is 15cm. Find the nature, position and size of the image.
The speed of light in air is $3 \times 10^8 m / s$. In medium $X$ its speed is $2 \times 10^8 m / s$ and in medium $Y$ the speed of light is $2.5 \times 10^8 m / s$. Calculate:
a. air ${ }^n x$
b. air ${ }^n y$
c. $X^n y$
Mention the major events during photosynthesis.
  1. Why did Mendel choose garden pea for his experiments? Write two reasons.
  2. List two contrasting visible characters of garden pea Mendel used for his experiment.
  3. Explain in brief how Mendel interpreted his results to show that the traits may be dominant or recessive.
Derive the expression for the heat produced due to a current 'l' flowing for a time interval 't' through a resistor 'R' having a potential difference 'V' across its ends. With which name is the
relation known? How much heat will an instrument of 12W produce in one minute if it is connected to a battery of 12V?
Study the following electric circuit and find.
  1. The current flowing in the circuit and
  2. The potential difference across $10\Omega$ resistor.
What are hydrocarbons? Give examples.