Question

unicellular organism?
(b) Where did the protozoa appear first!
Answer the following in brief.
(a) How were the sun and the planets i
our solar system created?
b) Write any two characteristics
animals.
Find the names of the planets in th
ox below.​

Answer 1

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(b) Where did the protozoa appear first!

Answer:-

Water.

(a) How were the sun and the planets in our solar system created?

Answer:-

Our solar system formed about 4.5 billion years ago from a dense cloud of interstellar gas and dust. The cloud collapsed, possibly due to the shockwave of a nearby exploding star, called a supernova. When this dust cloud collapsed, it formed a solar nebula—a spinning, swirling disk of material.

b) Write any two characteristics animals.

Answer:-

● Animals are multicellular.

● Animals are heterotrophic, obtaining their energy by consuming energy-releasing food substances.

● Animals typically reproduce sexually.

● Animals are made up of cells that do not have cell walls.

Answer 2

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Question A) :-

What is unicellular organism ?

Answer :-

A unicellular organism, also known as a single-celled organism, is an organism that consists of a single cell, unlike a multicellular organism that consists of multiple cells. Unicellular organisms fall into two general categories: prokaryotic organisms and eukaryotic organisms.

Question B) :-

Where did the protozoa appear first ?

Answer :-

Protozoa are singel - celled eukaryotes either - free living or parasitic , which feed on organism matter such as other microorganisms or organic tissues and debric. They appered first in water.They are motile, nearly all possess flagella, cilia, or pseudopodia that allow them to navigate their aqueous habitats

• Answer the following in brief

Question A) :-

How were the sun and the plants I our solar system created?

Answer :-

• Formation of sun

The Sun and the rest of the solar system formed from a giant, rotating cloud of gas and dust called a solar nebula about 4.5 billion years ago. As the nebula collapsed because of its overwhelming gravity, it spun faster and flattened into a disk.

• Formation of plants

Planets form from particles in a disk of gas and dust, colliding and sticking together as they orbit the star. The planets nearest to the star tend to be rockier because the star's wind blows away their gases and because they are made of heavier materials attracted by the star's gravity.

Question B) :-

Write any two characteristics animal ?

Answer :-

Two characteristics of animal are :-

• Animal are multicellular.

• Animal are made of cells that do not have cell walls.

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