Holidays' assignments for 9th

Enjoy while you work

 

Holidays’ Home Work 

                                       Class –9^th                                             Subject ----

Biology 

Q1   Which one of the following can be made into crystals?

(a)    A bacterium

(b)   An Amoeba

(c)    A Virus

(d)   A sperm

Q2   Chromosomes are made up of

(a)    DNA

(b)   Protein

(c)    DNA and protein

(d)   RNA

Q3   Plasmolysis in plant cell is defined as

(a)     Break down of plasma membrane in hypotonic solution

(b)   Shrinkage of cytoplasm in hypertonic solution

(c)    Shrinkage of nucleoplasm

(d)   Swelling of plant cell in hypotonic solution

Q4  Which of the following are covered by a single membrane?

(a)    Mitochondria

(b)   Vacuole

(c)    Nucleus

(d)   Plastid

Q5 Which cell organelle plays important role in detoxifying many poisons and drugs in a cell

(a)Golgi apparatus

(b) endoplasmic reticulum

(c)plasma membrane

(d)mitochondria

Q6 The undefined region of prokaryotic cell is known as

(a)    Nucleus

(b)   Nucleoid

(c)    Nucleic acid

(d)   Nucleolus

Q7  The cell organelle involved in forming complex sugars from  simple sugars are

(a)endoplasmic reticulum

(b)  ribosomes

(c) plastids

(d) golgi apparatus

Q8 Which of the following is not the function of vacuole?

(a)Storage

(b)providing turgidity to the cell

(c) Waste excretion

(d) Locomotion

Q9 Amoeba acquires food by

(a)Exocytosis

(b)endocytosis

(c) plasmolysis

(d) exocytosis and endocytosis both

Q10 The cell wall of which one of the following is not made up of cellulose?

(a)Bacteria

(b)Hydrilla

(c) Mango tree

(d) Cactus

      Short answers

Q1   Why are lysosomes known as suicidal bags of the cell?

Q2  Why is endocytosis found only in animals only?

Q3 Why do plant cells possess large sized vacuole?

Q4 How is a bacterial cell different from onion peel?

Q5 Name any cell organelle which is non membranous.

Diagrams

Draw labeled diagrams of :

--Animal cell

--Prokaryotic cell

High order thinking questions

Q1 Why does the skin of your finger shrink when you wash clothes for a long time?

Q2 A person takes concentrated solution of salt ,after sometime ,he starts vomiting .What is the phenomenon responsible for such a situation ?Explain.

Q3 In brief state what happens when

(a)    Dry apricots are left for sometime in pure water and later transferred to sugar solution ?

(b)   A red blood cell is kept in 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 ?

Q4 How are chromatin ,chromatid and chromosomes related to each other ?

Q5 Which kind of plastid is more common in

(a)    Roots of the plant

(b)   Leaves of the plant

(c)    Flowers and fruits 

Note—Develop habit of  newspaper reading   regularly and search any article /latest development or any research  appearing in the newspaper and paste the cutting .