Crop production and management — Science STD 8 — Question

Name two plant organ which is responsible for:
Making of food.

Which non-metals is used as a fuel?

Where would sound travel faster-in wood or in water?

Which of the following are non-luminous objects?

1. Orion.
2. Morning Star.
3. Moon.
4. Pole star.

1. A and B
2. B and C
3. B and D
4. Only C

Name the insect which is the carrier of parasite of malaria.

Name two metals which are used for making electric wires.

A highly poisonous animal Z which inhabits crop field is commonly known as friend of the farmer. It eats up pests like Y and saves the crops from damage.
The animal X is killed in large numbers to get its Z which sells in the market at a high price. What is X, y and Z?

Name the quantity whose unit is 'hertz'.

Which part of plant cell releases energy from food?

Name the nitrogen-fixing bacteria present in root nodules of leguminous plants.