Question

1. structure seen at a.
2. b
3. c
4. d
5. e
6. f
7. g
8. h
9. i
10. j
11. k
12. l
13. m
14. n

Explanation:

Step1: Identify structure A

Looking at the plant cell diagram, structure A is within the nucleus (B). The nucleus has a nucleolus (A), nuclear envelope (B), and chromatin (C). So A is the nucleolus.

Step2: Structure B

Structure B surrounds the nucleolus (A) and is the nuclear envelope, which encloses the nucleus.

Step3: Structure C

Structure C is the chromatin, the material (DNA + proteins) in the nucleus.

Step4: Structure D

Structure D is the rough endoplasmic reticulum (has ribosomes, E, attached), involved in protein synthesis.

Step5: Structure E

Structure E are ribosomes, small dots on rough ER (D), site of protein synthesis.

Step6: Structure F

Structure F is the cytoplasm, the gel - like substance filling the cell.

Step7: Structure G

Structure G is a chloroplast, organelle with chlorophyll for photosynthesis (green, in plant cell).

Step8: Structure H

Structure H is a mitochondrion, organelle for cellular respiration (oval with inner folds).

Step9: Structure I

Structure I is the large central vacuole, stores water, nutrients in plant cell (large blue structure).

Step10: Structure J

Structure J is the centrosome (in plant cell? Wait, plant cells have centrosome - like structures, but here J is likely the centrosome or a related organelle, but more accurately, in plant cell, the structure J could be the centrosome (though plant cells have different centriole arrangement, but diagram - wise, J is a small organelle, maybe the centrosome). Wait, correction: in plant cell, the structure J is the centrosome (or microtubule organizing center).

Step11: Structure K

Structure K is the cell wall, the outermost rigid layer of plant cell.

Step12: Structure L

Structure L is the cell membrane, inside the cell wall, controls what enters/exits.

Step13: Structure M

Structure M is the smooth endoplasmic reticulum, involved in lipid synthesis, no ribosomes.

Step14: Structure N

Structure N is the Golgi apparatus, modifies, sorts, packages proteins.

Answer:

1. Nucleolus
2. Nuclear Envelope
3. Chromatin
4. Rough Endoplasmic Reticulum (Rough ER)
5. Ribosome
6. Cytoplasm
7. Chloroplast
8. Mitochondrion
9. Large Central Vacuole
10. Centrosome (or related structure)
11. Cell Wall
12. Cell Membrane
13. Smooth Endoplasmic Reticulum (Smooth ER)
14. Golgi Apparatus