Which of the following is a correctly matched pair of useful microorganisms and
Microorganism
Activity
(I) Yeast
Ferments glucose to produce alcohol
(II) Bacteria
Decompose dead materials
(III) Nitrogen-fixing bacteria
Convert nitrogen into protein in plants
(A) I only
B) I and II
(C) II and III
(D) LII and III
Which of the following is the main difference between onion peel cells and human cheek cells
(A) Presence of mitochondria in onion peel cells only
B) Presence of cell wall in onion peel cells only
(C) Absence of plasma membrane in cheek cells
(D) Absence of endoplasmic reticulum
Given below are four steps for preparing a temporary mount of human cheek cells.
(i) Taking scraping from inner side of the cheeks and spreading it on a clean slide
(ii) Putting a drop of glycerine on the material
(iii) Adding two or three drops of methylene blue
(iv) Rising the mouth with fresh water and disinfectant solution
What is the correct sequence of the steps?
(A) i-ii-iii-iv
(B) iv-i-iii- ii
(C) iv-i-ii-iii
(D) i-iii-ii-iv
Answers
1)i and ii
2) presence of cell wall in onion peel cells only
3)b
Answer:
Which of the following is a correctly matched pair of useful microorganisms and
Microorganism
Activity
(I) Yeast
Ferments glucose to produce alcohol
(II) Bacteria
Decompose dead materials
(III) Nitrogen-fixing bacteria
Convert nitrogen into protein in plants
(A) I only
B) I and II ☑️☑️☑️☑️
(C) II and III
(D) LII and III
Which of the following is the main difference between onion peel cells and human cheek cells
(A) Presence of mitochondria in onion peel cells only
B) Presence of cell wall in onion peel cells only ☑️☑️☑️☑️
(C) Absence of plasma membrane in cheek cells
(D) Absence of endoplasmic reticulum
Given below are four steps for preparing a temporary mount of human cheek cells.
(i) Taking scraping from inner side of the cheeks and spreading it on a clean slide
(ii) Putting a drop of glycerine on the material
(iii) Adding two or three drops of methylene blue
(iv) Rising the mouth with fresh water and disinfectant solution
What is the correct sequence of the steps?
(A) i-ii-iii-iv
(B) iv-i-iii- ii ☑️☑️☑️☑️
(C) iv-i-ii-iii
(D) i-iii-ii-iv