Natural Resources — Science STD 9 — Question

Martix of cartilage in made of:

1. Collagen
2. Chondrin
3. Ossein
4. Elastin

The sum of masses of the atoms in the molecules is known as:

The atoms of which of the following pair of elements are most likely to exist in free state?

A force of 50N is applied on a nail of area 0.001sqcm.Then the thrust on the nail is equal to:

Which of the following does not possess the ability to do work not because motion?

1. A sparrow flying in the sky.
2. A sparrow moving slowly on the ground.
3. A sparrow in the nest on a tree.
4. A squiral going up a tree.

Amphioxus belongs to:

1. Craniata.
2. Hemochordata.
3. Urochordata.
4. Cephalochordata.

1 Nanometer is equal to:

A group of related genera, with still less number of similarities as compared to the genus and species, constitutes.

1. Order.
2. Class.
3. Family.
4. Division.

Rough ER contains:

Fertilizers cause:

1. Eutrophication of water bodies.
2. Killing of most microorganisms.
3. Destruction of crumb structure of soil.
4. All the above.