21.‘Heartbeat Act’, which was making news recently, is associate with which field?

[A] Anti-Racism
[B] Termination of pregnancy
[C] Euthanasia
[D] Autism

Please answer all 4 questions correctly.

1. Applying Concepts 

All mammals have the same size hearts relative to their body size. Do their hearts beat at the same rate?

2. Interpreting Data

a. What is the resting pulse rate of a 7,000-kilogram African bull elephant?

b. What is the resting pulse rate of a 20-gram mouse? How many complete heartbeats is that per second?

c. What general statement can be made regarding the effect of body size on heart rate in mammals?

3. Making Inferences

a. The data in the graph, plotted on logarithmic coordinates (that is, the scale rises in powers of 10), fall nicely upon a straight line. How would you expect them to look plotted on linear coordinates?

b. As you walk through the graph from left to right, the line slopes down. This is called a negative slope. What does the negative slope of the line signify?

4. Drawing Conclusions

If you plotted data for an experiment measuring body mass versus resting oxygen consumption, you would get exactly the same slope of the line as shown in this graph. What does this tell us about why body size affects heart rate in mammals as it does?

Aim: To Analyze Tyndal Effect, Hardness of Water (Metal), germination and growth of seeds using water from Different source. Sample:
1. RO water
2. RO Waste water
3. Tap water
4. Water collected by washing vegetables and fruits.
5. Water from aquarium (fish tank).

PROCEDURE: Collect samples of water about 100 add 50ml of each sample separately in a
glass tumbler. Add 1 drop of dye to each sample and note the colour change and different
among the colors formed in each glass.
Dip the cloth in the coloued water and dry the cloth to analyse the colour variation
Add soap solution to each sample separately and check lather formation.
Sample Intensity of colour Lather formation using soap
1
2
3
4
5
Intensity of colour- (light, dark, darker)
To analyze Tyndale effect, take samples of water separately in the glass tumbler and place it
again the white background (screen). Now allow the light pass through the glass of water in
such away that is has to fall on to the screen.

Note the variations among the intensity of the light while passing to different samples of water.
To analyze the effect the samples of water on seed germination.
Take samples of water separately in a separate glass tumbler soak the seeds for 8 hours then
keep the seeds on tissue paper separately and sprinkle the sample water to find the effect of
water on germinating seeds.


Germination rate ( Slow, fast, faster)
Draw inference referring to the points given below
Germination of seed requires water with nutrient
Lather formation shows mineral salt in water
Colour variation in water after adding dye shows density of water
Intensity of light shows presence of colloidal particles in water.

Questions:
Which water sample is most suitable of seed germination?
Which water sample contains more mineral salt to increase its hardness?
Which water sample is denser?
Which water sample shows more colloidal particles?

Which of the following are not threats to internal validity (select all that apply)?

1. Accuracy of assessment of disease
2. The intervention is not feasible in a real-world setting
3. Selection bias of controls
4. Appropriate calculation of measures of association
5. Comparability of study groups