9th SCIENCE and Mathematics NCERT SOLUTIONS

A. Answer these questions 1. Name the three life process help living being to procure energy from food? Answer: Three life processes that help living organisms to procure energy from food are: (i) Digestion (Nutrition) (ii) Respiration (iii) Transportation 2. What are Autotrophs? Name an organism other than other than green plant that is an autotroph. Answer: Autotrophs are organisms that can prepare their own food. Chlamydomonas is a type of green algae which is an example of an autotroph, other than green plants. Cyanobacteria are also an example of autotroph. 3. Name three type of heterotrophic nutrition Answer: Three types of heterotrophic nutrition are: (i) Saprophytic nutrition (ii) Parasitic nutrition (iii) Holozoic nutrition 4. What are enzymes? Answer: Enzymes are chemical substances that act as biological catalysts and are important for carrying out biochemical processes, such as digestion, in our body ...

8th Class Cell structure and function solved questions(Biology)

August 05, 2016

Q Name the cells having branches structure. Ans Nerve Cell. Q Why cells could not be observed before seventeenth century? Ans Cells could not be observed before seventeenth century because till that time microscope was not invented. Q Why plant cell have cell wall? Ans Plant cells need protection against variations in temperature, high wind speed, atmospheric moisture, etc. They are exposed to these variations because they cannot move. That's why they have cell wall. Q Which organism has the smallest cell? Ans Mycoplasmas, a bacteria has the smallest cell of the size of 0.1 micron i.e. ten thousandth part of a mill metre. ' Q Which is the largest cell visible by unaided eye? Ans Ostrich egg has the largest visible cell by unaided eye. Q Name the four elements, which fonn major part of protoplasm. Ans These are carbon, hydrogen, oxygen and nitrogen. Q Give two examples of prokaryotes. Ans Bacteria and blue green algae. Q Name the la...

VI (6th) Fun with Magnets MCQ’s

October 23, 2012

CBSE - Class 6 - Science Chapter :Fun with Magnets Multiple choice Questions (1) When a magnet is suspended freely it always aligns itself in -------- direction? a) North b) N-S c) N-W d) N-E (2) ---------- is the only natural magnet. a) Magnetite b) Ebonite c) Cobalt d) Nickel (3) Which of the following cannot be used to make a magnet? a) Cobalt b) Iron c) Ebonite d) Steel (4) Which of the following is not a non-magnetic substance? a) Glass ...

IX Biology:Extra marks Guess Solved Question paper : Cell and its Function

June 16, 2012

IX The Cell & Fundamental Unit of life Question : Why is the cell known the 'fundamental and structural unit of life ' Ans: ell is called as the structural and functional unit of the living organism because it the smallest living entity that is capable of an independent existence. Separated cell organelles cannot be said to be living and are not capable of independent existence. Question : what is a semi permeable membrane? what are the differences between semi permeable membrane and selectively permeable membrane? Ans: a semi permeable membrane is a membrane that allows only the entry of substances that are helpful for the body. a semi permeable membrane is also called a selectively permeable membrane. Question : Which cell in the human body does not have the mitochondria? Ans: Mature erythrocytes don't have mitochondria Question : What are plastids? Write their functions? Ans: Plastids are double membrane organelle...

Class X CH-3 PAIR OF LINEAR EQUATION IN TWO VARIABLES SA-1

September 15, 2012

Q.1. Draw the graph of 2y = 4x – 6 2x = y+ 3 And determine whether this system of linear equation has a unique solution of not. Q.2. solve the following system of linear equation: 5x – 6y + 30 = 0 5x + 4y – 20 =0 Find the vertices of the triangle formed by the above two lines and x-axis. Q.3. solve graphically the system of linear equation: 4x – 3y + 4 = 0 4x + 3y – 20 = 0 Find the area of the region bounded by these lines and x-axis. Q.4. find value of k for which the systems of equation have a unique solution: X – ky = 2 3x + 2y = -5 Q.5. find value of k for which the systems of e...

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