Assignment for 9th and 10th

Assignment no.11 for 9th

Q1  what is function of vacuole and centriole?
Q2  Define tissue? 
Q3  Differentiate between the temporary and permanent 
tissue ?
Q4  Write the characteristic features of meristematic cells.
Q5  Classify meristematic cells and explain the function of each type along with labelled  diagram.
Q6 How are simple tissue  different from complex ?
Q7 Write the functions and location   of the  following :
(a) Different types of parenchyma
(b) collenchyma
(c) sclerenchyma
(d) stomata
(e) epidermis
(f) cork cellsDraw labelled diagram :
(a) parenchyma , (b) collenchyma , (c) Sclerenchyma (d)stomata

HOTS

Q1 Why do we call  meristematic  cells as temporary cells?
Q2 Why do we need tissue formation when even a single cell also perform all the functions like Amoeba.
(hint - In advanced multicellular organisms the body performs complex functions which need specialized structure to perform such functions)

Assignment no. 14 for 10th 

Q1 What is lymph ?Write it's function.
Describe the process of rising of cell sap (mention the two main factors responsible for the same).
Q3 Compare the movement of water and food in plants.( write answer  in the form of table or points).
Q4 What is excretion? Why are kidneys called the excretory organs whereas other organs like lungs ,skin etc. also help in excretion?
Q5 draw labelled diagram of 
(a)human excretory system (b) Unit of excretion i.e. nephron 
Q6 Name the metabolic excretory products of (a) human being (b) plants
Q6 Explain the process of excretion in human being highlighting the main three steps taking place in nephron.
List the metabolic wastes of (a) human beings, (b) plants
HOTS
Q1 How does water rises up  in the plants without utilizing energy ?
Q2 what happens when a person's kidneys doesn't work (may be due any infection or any other reason).
Q3 How does plant remove their waste when they don't have any excretory system like humans?
Q4 Can we call lungs excretory organs instead of respiratory?
Q5 Why does the lymph not have red blood corpuscles?
(hint -they are large and don't have amoebic movement so that they may cross the capillary membrane)