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Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.

Three groups of plants that bear archegonia are given below: Bryophytes Pteridophytes Gymnosperms. The life cycle of a pteridophyte, then it consists of two morphologically distinct phases: (i) The gametophytic phase (ii) The sporophytic phase. These two phases come one after another in the life cycle of a pteridophyte and this phenomenon is called alternation of generation. The gametophyte...

Water Canal System is the feature of



Sea anemone



Water pollution 

Give me a easy answer 

The difference in mass makes the pull of earth stronger so it rortates around earth.It does not move closer because its in equilibrium,its roations and revolution counteract the pull of the earth.It remains so because its angular moomentum is conserved.


mention the options with respect to mitosis.  

What is antigen?

A substance That enters the body and start a process that can cause disease.  The body then usually produces Substances  to fight the integer

well in a reference book iits stated that phosphorus is a constituent of cell membrane, part of protein and dna and rna synthesis.

but in an explanation for the question for mineral transport exam of career 360 its stated thatc phosphorus is not a constituent.

which one is correct?

Phosphorus is also a component of cell membrane structure but in the form of phospholipids, 
Pollination of the hyacinth and water lily is brought about by the agency of insects and winds.

Q2. What shape is (a) Your instrument box? (b) A brick? (c) A matchbox? (d) A road-roller? (e) A sweet laddu?

the shape of the following things are (a) Your instrument box- Cuboid (b) A brick- Cuboid (c) A matchbox-Cuboid (d) A road-roller- Cylinder (e) A sweet laddu-Sphere

Find (i)\frac{7}{9}-\frac{2}{5} \ \ \ \ \ (ii) 2 \frac{1}{5}-\frac{(-1)}{3}

1:-  0.5

2:-  2.5

What will be the additive inverse of \frac{-3}{9} ?, \frac{-9}{11} ?, \frac{5}{7} ?$

The additive inverse of   The additive inverse of  The additive inverse of  

What is binary number

A binary number is represened by 0 and 1. The binary number system has base 2. It is used in digital electronics. For example 7 can be represented in binary system as 111. That is 

1. To at Rot Rat - 1 sin 60° cos 30° + sin 30° cos 60° (1) 2 tan 450+ cos² 30° - sin 60° cas 450 un soc 30 + cosec 30° (v) sin 30° + tan 45° - cosec 60° soo 30° + cos 60° + cot 45° scor 60° + 4 sec 30° - tan* 45° sin 30° + cos² 30°

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Nios board

NIOS is National Institute of Open Schooling and is the board under the Union Government of India.  

Calculate the molar mass of the following substances. (c) baking soda



Why is glass considered a super cooled liquid?

Glass is an amorphous solid. Just like liquids, amorphous solids also have a tendency to flow, though very slowly. Therefore, these are called pseudo solids or supercooled liquids.

During sunrise and sunset, the light has to travel a long distance in the atmosphere. So light of small wavelength scatters and the least scattered light reaches our eyes. Red is the least scattered light. So sky looks red.

The following are the reasons for using steel instead of other materials to make robots. 

1. Steel is commonly available and it is found in the form of an alloy of Iron.

2. It is stronger than other metals like aluminum.

3. Welding is easy to do 

4. It blunts tools easily.

Hence the above reasons make steel favorable building material for Robots.


The material selected for making robot depends on the application. Wood, plastics, aluminium, steel, ceramics etc are used to make a robot. 

How many stars in milky way?