Question

(a) With respect to a unicellular organism which statement is correct?
(i) Tissues work in coordination to perform different functions
(ii) These organisms do not require food
(iii)These organisms reproduce and respire
(iv)All unicellular organisms move with the help of cilia

b)Sumita was observing a cell under the microscope and was able to see a cell membrane and
nucleus.What can be said about the cell with absolute surety?
A. It is a prokaryotic cell
B. It is a eukaryotic cell
C. It is a plant cell
D.It is an animal cell
(i) Only A (ii) Both B and C (iii) Both B and D (iv) only B

c) Identify the correct statement :
(i) Tissue is a group of dissimilar cells. (iii) Vacuoles are not found in plant cells.
(ii) An organ consists of similar cells. (iv) Prokaryotes do not have nucleus.
Differentiate between the cell of a bacteria and your own body.
d)Which cell do you think existed on Earth first, a prokaryotic cell or a eukaryotic cell? Give a reason to
support your answer

Answer 1

Hey friend, here is your answer.

Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. Heat energy can be transferred from one object to another. The transfer or flow due to the difference in temperature between the two objects is called heat.

Sources of heat energy:

(1) The biggest example of heat energy in our solar system is the sun itself. The sun radiates heat to warm us up on the planet earth. When the burner of a stovetop is very hot, it is a source of heat energy.

(2) The sun is by far the most important heat energy source. This energy can be stored sunshine from millions of years ago in the form of fossil fuels, or of current supply such as biomass and solar thermal. Today, the heat energy used is more than 80% fossil (coal, gasand oil).

Hoping that it will help you.

Answer 2

1. iii)
2. iv)
3. ii)

hope it helps you