Transportation in Animals and Plants — Science STD 7 — Question

Explain all three modes of heat transfer with suitable examples.

Why is it important to use SI units while recording measurements?

With the help of an activity prove that light is necessary for photosynthesis.

State some ways to prevent soil erosion.

Match the following:

Land breeze blows during	summer
Sea breeze blows during	winter
Dark coloured clothes are preferred during	day
Light coloured clothes are preferred during	night

Differentiate between asexual reproduction and sexual reproduction in plants.

A student took hot milk and poured it into four containers at same level as shown below. Which container will cause temperature of hot milk to drop at the slowest rate?

Table : Testing the nature of samples with blue and red litmus papers

Name of the Sample	Colour of blue litmus paper after putting a drop of sample	Colour of red litmus paper after putting a drop of sample
Lemon juice	Red	Red
Soap solution	Blue	Blue
Amla juice	Red	Red
Tamarind water	Red	Red
Vinegar	Red	Red
Baking soda solution	Blue	Blue
Lime water	Blue	Blue
Tap water	Blue	Red
Washing powder solution	Blue	Blue
Sugar solution	Blue	Red
Salt solution	Blue	Red
Orange juice	Red	Red