Question

Class 9 Science - CBSE - Matter in our surroundings

I. Choose the correct option:

1. Which out of the following is not a function of a vacuole?
(a) Storage
(b) Providing turgidity and rigidity to the cell
(c) Waste excretion
(d) Locomotion

2. Silver nitrate solution is used to study
(a) endoplasmic reticulum
(b) golgi apparatus
(c) nucleus
(d) mitochondria

3. The fact that a cell arises from the pre-existing cells was stated by
(a) Haeckel
(b) Virchow
(c) Hooke
(d) Schleiden

4. 1 µm is
(a) 10–6 m
(b) 10–9 m
(c) 10–10 m
(d) 10–3 m

5. A cell will swell up if
(a) the concentration of water molecules in the cell is higher than the concentration of water molecules in the surrounding medium.

(b) the concentration of water molecules in the surrounding medium is higher than the
concentration of water molecules in the cell.

(c) the concentration of water molecules is the same in the cell and in the surrounding medium.

(d) The concentration of water molecules does not matter.

6. The following are a few definitions of osmosis. Read carefully and select the correct definition
(a) Movement of water molecules from a region of higher concentration to a region of lower concentration through a semi permeable membrane
(b) Movement of solvent molecules from higher concentration to lower concentration
(c) Movement of solvent molecules from higher concentration to lower concentration of a solution through a permeable membrane
(d) Movement of solute molecules from lower concentration to a higher concentration of the solution through a semi-permeable membrane


II. Name the following:

1. The parts of a plant in which chromoplast, chloroplast and leucoplast are present.

2. The cell organelles which are non-membranous.

3. The organelles which show the analogy as stated:
a) Transporting channels of the cell
b) Digestive bag of the cell
c) Storage sacs of the cell
d) Control room of the cell
e) Kitchen of the cell
f) Packaging and dispatching unit of the cell


III. Answer the following questions:

Q1. How is a bacterial cell different from an onion peel cell?

Q2. Bacteria don’t have chloroplast but some bacteria are photosynthetic in nature and perform photosynthesis. Which part of the bacterial cell does this?

Q3. What happens to RBCs and onion peel cells if kept in a hypotonic solution? Explain the reason for
your answer.

Q4. A person starts vomiting after consuming a concentrated salt solution. Explain the phenomenon
responsible for such a situation.

Q5. How do substances like carbon dioxide and water move in and out of a cell?

Q6. Why are lysosomes known as ‘scavengers of the cell’?

Q7. Differentiate between rough and smooth endoplasmic reticulum. How does the smooth endoplasmic reticulum help in biogenesis?

Q8. Find out the false sentences and correct them:
(a) Golgi apparatus is involved with the formation oflysosomes.
(b) Nucleus, mitochondria and plastid have DNA; hence they are able to make their own structural proteins.
(c) Mitochondria is said to be the powerhouse of the cell as ATP is generated in them.
(d) Cytoplasm is called protoplasm.

Q9. Why does the skin on your finger shrink when you wash clothes for a long time?

Q10. In brief, state what happens when:
(a) dry apricots are left for sometime in pure water and later transferred to a sugar solution.
(b) a red blood cell is kept in a concentrated saline solution.
(c) the plasma membrane of a cell breaks down.
(d) rheo leaves are boiled in water first and then a drop of sugar syrup is put on it.
(e) golgi apparatus is removed from the cell.


IV. Draw and label the following:

1. A plant cell and label the partwhich:
a) determines the function and development of the cell.
b) packages materials coming from the endoplasmic reticulum.
c) is a fluid contained inside the nucleus.
d) is a site for various biochemical reactions necessary to sustain life.

2. A neat labelled diagram of an animal cell.

3. A neat diagram of a plant cell and label any three parts which differentiate it from an animal cell?

4. A well-labelled diagram of a eukaryotic nucleus. How is it different from a nucleoid

Answer 1

Answer:

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Explanation:

1. Locomotion

2.golgi apparatus

3.Virchow

4.0.001

5.the concentration of water molecules is the same in the cell and in the surrounding medium.