Match the following:

$\begin{matrix} A & B 1. H a i r a n d m u c u s i n n o s t r i l s & a . a s s i s t s i n i n h a l a t i o n a n d e x h a l a t i o n 2. C a r t i l a g e i n t r a c h e a & b . i n c r e a s e s u r f a c e a r e a o f a b s o r p t i o n 3. A l v e o l i & c . p r e v e n t s e n t r y o f f o r e i g n b o d i e s 4. D i a p h r a g m & d . p r e v e n t s c o l l a p s e o f t r a c h e a l s t r u c t u r e \end{matrix}$

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Solution

Answer: 1 - c, 2 - d, 3 - b, 4 - a

In our nose, the hair and mucus act as a filter and prevent dust and other harmful substances from entering the body by trapping them. The C- shaped Cartilaginous rings provide structural support to the trachea and prevent it from collapsing. Alveoli are small air sacs in the lungs where gaseous exchange takes place. They are spread out all over the lungs so that it increases the surface area for the gaseous exchange. The diaphragm is a muscular sheet that's present beneath the chest cavity. It helps in the process of breathing.

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Q. Which of the following contraceptive methods do not correctly match with its mode of action?

\begin{matrix} C o n t r a c e p t i v e m e t h o d & M o d e o f a c t i o n (i) V a s e c t o m y & B l o c k s s p e r m t r a n s p o r t (i i) I U C D s & P r e v e n t i m p l a n t a t i o n (i i i) O r a l p i l l s & K i l l s t h e s p e r m s (i v) C o n d o m s & P r e v e n t d e p o s i t i o n o f s e m e n i n t h e v a g i n a \end{matrix}

$\begin{matrix} R a n g e & F r e q u e n c y & C u m u l a t i v e f r e q u e n c y 0 - 10 & 5 & (b) 10 - 20 & (a) & 8 20 - 30 & 2 & (c) 30 - 40 & 6 & (d) \end{matrix}$

Fill in the missing slots and find the value of $(a) + (b) + (c) + (d)$ .

$\begin{matrix} x_{i} & f_{i} & f_{i} x_{i} 4 & 10 & . . . . . . . . 8 & 11 & . . . . . . . . 12 & 9 & . . . . . . . . . 16 & 13 & . . . . . . . . . \sum f_{i} x_{i} = . . . . . . . . . . \end{matrix}$

Find the value of $\sum f_{i} x_{i}$ .

Look at the following table below.

$\begin{matrix} C l a s s i n t e r v a l & C l a s s m a r k 0 - 5 & A 5 - 10 & B 10 - 15 & 12.5 15 - 20 & 17.5 \end{matrix}$

The value of A & B respectively are:

Among these two scenarios, identify the action and reaction forces.

Scenario 1 $:$ A person is pushing a book on the table.

Scenario 2 $:$ A bullet is fired from a gun.

Then match the following.

$\begin{matrix} C o l o u m n - A & C o l o u m n - B 1. A c t i o n f o r c e & (a) F o r c e a p p l i e d b y t h e b o o k o n t h e b o y 2. R e a c t i o n f o r c e & (b) F o r c e a p p l i e d b y t h e b o y o n t h e b o o k (c) R e c o i l f o r c e o n t h e g u n (d) A c c e l e r a t i n g f o r c e o n t h e b u l l e t \end{matrix}$

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Match the following: AB1.Hair and mucus in nostrilsa. assists in inhalation and exhalation2.Cartilage in tracheab. increase surface area of absorption3.Alveolic.prevents entry of foreign bodies4.Diaphragmd.prevents collapse of tracheal structure