Improvement in Food Resources — Science STD 9 — Question

Each cell is amazing world in itself because:

Rusting of an article made up of iron is called:

Atom : .................... : : Electrons : Negatively charged:

The number of Al³⁺ ions in 0.051g of aluminium oxide are (Atomic mass of Al = 27u, O = 16u).

White fibres of connective tissue are made up of:

Nitromonas bacteria convert:

1. Nitrite to nitrate.
2. Ammonia into nitrate.
3. Ammonia into nitrite.
4. Nitrite into ammonia.

Phylum Chordata is named after the occurrence of:

1. Notochord.
2. Dorsal hollow nerve cord.
3. Occurence of postnatal tail.
4. Presence of gill slits.

Grit of pear is formed of:

Arthropods are characterised by:

1. Jointed legs.
2. Jointed appendages.
3. Chitinous exoskeleton.
4. All the above.

The cell organelle found in prokaryotes as well as eukaryotes is