CBSE/NCERT/Exercises/Class_09_Science
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
BioNotesBioNotesCreated by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Online
NCERT Biology Exercises for Class 09 Biology - Introduction to Life - Class_09_Science
(i) Cell membrane and cell wall (permeability)
(i) Salt molecules moved into Cell Y, causing it to shrink. (ii) Water moved into Cell X and more water moved out of Cell Y than the salt solution entered in it. (iii) Water moved into Cell X and moved out of Cell Y through the cell membrane. (iv) Solute movement caused osmosis in both cells.
(Note: Referring to general cell structure as described in the chapter)
| Option | Present in the plant cells | Absent in the animal cells |
|---|---|---|
| (i) | Leucoplast | Cell wall |
(i) Chloroplasts, Ribosomes (ii) Mitochondria, Nucleus (iii) Golgi bodies, Ribosomes (iv) Nucleus, Lysosomes
(i) What hypothesis is being tested?
| Structure | Bacterial Cell | Animal Cell |
|---|---|---|
| Chromosome | Present (Single circular) | Present (Multiple linear) |
| Nucleus | Absent (Nucleoid present) | Present |
| Mitochondria | Absent | Present |
| Golgi complex | Absent | Present |
| Chromoplasts | Absent | Absent |
(i) Why does water gather in Cup B and C?
(i) Ribosome — Protein synthesis (ii) SER — Lipid and cellulose synthesis (iii) Lysosome — Digestion of foreign agents
(i) Scientific concept?