Carbon and its Compounds — Science STD 10 — Question

“Burning of fossil fuels results in global warming". Give reasons to justify this statement.

Name any four types of ornamental plants which are being produced by tissue culture technique.

Draw ray diagrams showing the image formation by a concave lens when an object is placed: At the focus of the lens.

Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configurations of these two elements. Which of these will be more electronegative? Why?

What are hormones? Name the hormone secreted by thyroid and state its. function.

Which of the following are endothermic reactions and which are exothermic reactions?

1. Burning of natural gas.
2. Photosynthesis.
3. Electrolysis of water.
4. Respiration.
5. Decomposition of calcium carbonate.

Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.

From where do the aquatic animals and terrestrial animals obtain oxygen for breathing and respiration?

Are plants actually producers of energy?

Explain how, it would benefit deep sea divers if humans also had gills.