Write one function of each of the following five parts of the human eyeball: [1 × 5 = 5]
(a) Cornea
(b) Lens
(c) Choroid
(d) Vitreous humour
(e) Retina
OR
Mention three changes occurring during the Anaphase stage of mitosis in an animal cell. Write the names of any two structural parts of the eukaryotic chromosome. [ 3 + 2 = 5]
WBBSE
Class X
Life Science
01 (d) Nervous System
02 (a) Cell Division and Cell Cycle
05 Mark
2023
| Part | Function |
|---|---|
| Cornea | Refracts (bends) light entering the eye onto the lens. |
| Lens | Focuses light rays onto the retina for clear vision. |
| Choroid | Provides nutrients to the retina through its dense network of blood vessels. |
| Vitreous humour | Maintains the shape of the eyeball and supports the retina by filling the posterior cavity with a gel-like substance. |
| Retina | Converts light into electrical signals that are sent to the brain for visual processing. |
Or
Here are three changes occurring during the Anaphase stage of mitosis in an animal cell in very short points:
- Centromeres split, and sister chromatids separate.
- Mitotic spindle elongates, pulling sister chromatids to opposite poles.
- Nuclear envelope breaks down, allowing chromosomes to enter the cytoplasm.
Here are the names of two structural parts of the eukaryotic chromosome in very short points:
- Centromere: A specialized region of the chromosome that is involved in cell division.
- Chromatids: The two identical copies of a chromosome that are produced during DNA replication.
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