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Q

What is a cell?

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S Shaili sahu
Answered Sep 09, 2019

Structural and functional unit of living being

Q4. Give a brief description of the process of synthesis of food in green plants.

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D Divya Prakash Singh
Answered May 05, 2019

The leaves have a green pigment called chlorophyll. It helps leaves to capture the energy of the sunlight. This energy is used to synthesize (prepare) food (carbohydrates) from carbon dioxide and water. Since the synthesis of food occurs in the presence of sunlight, it is called photosynthesis.

The process equation as follows: 

 

Q3. How would you test the presence of starch in leaves?

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D Divya Prakash Singh
Answered May 05, 2019

To test the presence of starch in leaves: Perform iodine test by adding iodine solution to the leaves,  if there is starch present on the leaves then iodine makes a complex of dark blue color with the starch.

Hence we can test the presence of starch in the leaves.

Q2. Distinguish between a parasite and a saprotroph.

 

 

 

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D Divya Prakash Singh
Answered May 05, 2019

Difference between Parasites and Saprotrophs:

Parasites Saprotrophs

A parasite derives its nutrients from the living organism and it deprives the host of valuable nutrients. For example, Mosquito. 

Saprotroph organisms take in nutrients from dead and decaying matter. For example, Fungi.

 

Q1. Why do organisms take food?

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D Divya Prakash Singh
Answered May 05, 2019

Organisms take food to:

(i) Get the energy to carry out life processes.

(ii) Build thier bodies.

(iii) To grow.

(iv) Repair damaged parts of their bodies.

 

Q1 Find the principal and general solutions of the following equations:

\tan x= \sqrt{3}

 

 

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G Gautam harsolia
Answered Jun 06, 2019

It is given that given 
\tan x= \sqrt{3}
Now, we know  that \tan\frac{\pi}{3}= \sqrt3 and \tan\frac{4\pi}{3}= \tan \left ( \pi+\frac{\pi}{3} \right )=\sqrt3

Therefore,
the principal solutions of the equation are x = \frac{\pi}{3},\frac{4\pi}{3}
Now,
The general solution is \tan x =\tan \frac{\pi}{3}

x =n{\pi} + \frac{\pi}{3}  where n \ \epsilon \ Z and Z denotes sets of integer

Therefore,  the general solution of the equation is x =n{\pi} + \frac{\pi}{3}  where n \ \epsilon \ Z and Z denotes sets of integer

 

4. 15.8m
 

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A Abhishek Sahu
Answered Apr 04, 2019

Maximum height will be attained when the final velocity will become zero.

v^{2} -u^{2} = 2\left ( -g \right )h

0^{2} -15.3^{2} = 2\left ( -10 \right )h_{max}

h_{max } = 11.7 m

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