PLEASE READ THE 5 ONE WORD/LINE QUESTIONs CAREFULLY N HELP ME OUT
Q -1 Roots of all plants always bend away from the stimulus X . This directional
movement in response to stimulus X is known as ?
Q- 2 What all does the Forebrain control ?
Q-3 Which has the highest mass ? -
30.11 ×10²³ molecules of CO₂
4 moles of sodium carbonate
1.8 × 10²⁵ molecules of methane
5 moles of MgCl₂
Q-4 If 1 kg of water is mixed with 2 kg of liquid of density 3 g / cm³ then average
density of mixture will be ?
Q-5 A thin bar of length f is placed horizontally along the principal axis of a concave
mirror of focal length f in such a way that centre of the bar coincides with the
centre of curvature of the mirror . The length of image will be ?
a) 4f b) 7f ÷ 3 c) 4f ÷ 3 d) 3f ÷4
THANKS A TON !!!
THE BEST ANSWER WILL BE REWARDED AS BRAINLIEST
Answers
1)If roots and stems bend away from the stimulus, then this is known as negative tropism.
2)The sub divisions of forebrain are hypothalamus, thalamus and cerebrum. They are responsible for perceiving sensory information, understanding language and controls autonomic functions like controlling heart beat rate, respiration rate and metabolism rate.
3)1.8x10 raise to power 25 molecules of methane have highest mass. We can calculate this by converting all of them into moles by dividing their molecules with Avogadro’s number i.e. 6.022x10 raise to power 23 and then by multiplying moles with their molar mass.
4)Mass of water=1kg
Mass of liquid=2kg
density of liquid=3g/cm3
As,
Density=Mass x Volume
density of the first liquid =1000×3=3000g/cm3
density of the second liquid =2000×3=6000g/cm3
the average density=3000+6000/2=4500g/cm3
5)If object of length f is placed, then its answer will be zero. As the radius of curvature=2f
For object distance=q=2f-f=f
The spherical mirror formula is:
1/f= 1/p+1/q
For concave mirror,
1/f=1/p-1/q
-1/f+1/f=1/p (image distance)