Tissues — Science STD 9 — Question

1. Discuss two ways of incorporating desirable characteristics into crop varieties.
2. What is inter-cropping? How are crops selected for inter-cropping?

Both bacteria and Amoeba are single-called, yet are placed in different kingdoms. Give one reason.

What is the procedure of providing distinct and proper names to organisms?

Shyam and his friends were playing with a catapult (gulel) in his garden. Several mangoes were dislodged and fell with the help of catapult. One of his friend was aiming the catapult on a bird. Shyam prevented him from doing so.
a. Name the energy possessed by the stretched string of the catapult.
b. What will happen if the stone is thrown without stretching the string of a catapult?
c. Why did Shyam prevent his friend from aiming at the bird? Which quality is highlighted in Shyam's behaviour?

Draw a labeled diagram of the experimental set-up to study the latent heat of fusion of ice.

In a cluster of hutments, many people are suffering from malaria. Mention the unhygienic conditions that must be prevailing in that locality. How does a doctor confirm malaria?

Bacteria do not have chloroplast, but some bacteria are photoautotrophic in nature and perform photosynthesis. Which part of bacterial cell performs this?

Write a note on areolar tissue.