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Thursday, 26 October 2017

some notes for 9th

Class 9th (Diversity in living beings)
some useful inputs by sarthak Goel (9th F) 
It's really very satisfying to see students interacting and even drafting notes for fellow friends 
I'm waiting some more to come........



Explanation of Monera , Protista and Fungi -

1. Monera :
a. These are made up of prokaryotic cells so are called prokaryotes.
b. Most of these organisms are unicellular except cyanobacteria which is multicellular.
c. Some of them has a cell wall but some of them do not have cell wall.
d. They have either autotrophic or heterotrophic mode of nutrition.
Example - anabaena, bacteria, etc.

2. Protista :
a. They are unicellular Eukaryotic organisms.
b. They have locomotory organs (appendages) in the form of-
Celia( hair like structure)
Flagella( long whip like structure)
c. Mode of nutrition can be autotrophic or heterotrophic.
Example- paramoecium, amoeba and euglena.

3.Fungi :
a. They are heterotrophic Eukaryotic organisms.
b. They are saprophytes as the use decaying organic material as food.
c. They can become multicellular at some stages of life.
d. Cell wall is made from tough Complex sugar called chitin.
Example- aspergillus, penicillium and agaricus.
    

                                                    - by Sarthak Goel
                                                             9th -F

Tuesday, 10 October 2017

Assignment no 21 for 10th

Assignment no 21 for 10th
Q1 Explain the mechanism of sex determination in human beings.
Q2 With the help of suitable illustration , explain the process of
(a)Evolution through natural selection
(b)Evolution by chance
Q3Prove that acquired traits are not inherited?
HOTS
Q1 Describe the process of speciation with the help of key factors .
Q2 How much chance a wrestler hold for his son to be a wrestler?Give reason for your answer? 

Assignment 20 for 9th

Assignment 20 for 9th
Q1 What condition is required to make a disease free person completely healthy?
Q2 What precautions should be taken to prevent the spread of following diseases :
(a) Jaundice
(b) Polio
(c)cholera
(d) pneumonia
(e)Influenza
(f)Tuberculosis
Q3 What precautions should be observed to prevent the spread of Malaria or dengi?
HOTS
Q1 Why during rainy season the treat of dengi ,malaria and cholera increases?
Q2 why is it advised not to consume road side open food items?