Q1) What is the working principle of a mercury thermometer?
Q2) What is the normal direction of heat transfer?
Q3) A brass tumbler feels much cooler than a wooden tray on a chilly day. Why?
Q4) Rahul covers a distance of 280 km in 4 hours. Find his average speed during this trip
Q5) The average speed of a motor bike is 60 km/h. How much time does it take to cover 210 km?
Q6) Differentiate between the following:
(i) aerobic respiration and anaerobic respiration
(ii) Inhalation and exhalation
(iii) respiration and photosynthesis
(iv) Breathing and respiration
( v) Stomata and gills
Q7) What will happen if there are no platelets in blood?
Q8) What is ECG? What information does it gave about a person
Q9) Explain transportation of water in plants.
Q10) Write a brief note on human heart.
Q11) Explain different type of blood vessels.
Q12) Differentiate between
(i) xylem and phloem
(ii) Transportation and transpiration
(iii) Red blood cells and white blood cells
Q13) Differentiate between
(i) fragmentation and budding
(ii) Vegetative and reproductive parts of a plant
Q14) How does fertilization takes place in a flowering plant?
Q15) Explain the structure of the female reproductive part of a flower
all the questions
Answers
Answer:
1-In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Mercury thermometers can be used to determine body, liquid, and vapor temperature
2-Throughout the universe, it's natural for energy to flow from one place to another. And unless people interfere, thermal energy — or heat — naturally flows in one direction only: from hot toward cold.
3-The thermal conductivity of brass is high i.e., brass is a good conductor of heat. So, when a brass tumbler is touched, heat quickly flows from human body to tumbler. Consequently, the tumbler appears colder, on the other hand wood is a bad conductor.
4-Average speed = Total Distance/total time taken
=> speed = 280/4
= 70
=> avg speed = 70km/hr
5-Distance=Speed×Time
When speed is 40 kmph
Distance traveled by car =40×9
=360 km
When speed is 60 kmph
Time taken to complete the journey =
60
360
=6 hours
6-
first question answer
In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature.
second question answer
Throughout the universe, it's natural for energy to flow from one place to another. And unless people interfere, thermal energy — or heat — naturally flows in one direction only: from hot toward cold.
third question answer
The thermal conductivity of brass is high i.e., brass is a good conductor of heat. So, when a brass tumbler is touched, heat quickly flows from human body to tumbler. Consequently, the tumbler appears colder, on the other hand wood is a bad conductor.
fourth question answer
nswer and earn points.
Answer
0

parthnangroo
Ambitious
72 answers
4.1K people helped
fifth question answer
that completely depends on how long the bike keeps it up. By a striking mathematical coincidence, less time will mean less distance, and more time will mean more distance.
In general, the bike will cover 1 km of distance FOR EACH MINUTE it moves at 60 km/hr
sixth question answer
I am sorry don't know answer
seventh question answer
What will happen if there are no platelets in the blood? Solution5: The blood clots due to the presence of platelets. If there are no platelets in the blood, then after a minute injury or cut, the blood will not clot and continue to flow outside the body and the person might die.
eight question answer
An ECG (electrocardiogram) records the electrical activity of your heart at rest. It provides information about your heart rate and rhythm, and shows if there is enlargement of the heart due to high blood pressure (hypertension) or evidence of a previous heart attack (myocardial infarction.
ninth question answer
Overall, water is transported in the plant through the combined efforts of individual cells and the conductive tissues of the vascular system. ... It is carried upward through the xylem by transpiration, and then passed into the leaves along another water potential gradient.
tenth question answer
The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes. "The tissues of the body need a constant supply of nutrition in order to be active," said Dr.
eleventh question answer
The Three Major Types of Blood Vessels: Arteries, Veins, and Capillaries. Blood vessels flow blood throughout the body. Arteries transport blood away from the heart. Veins return blood back toward the heart.
twelve question answer
sorry don't know
thirteen question answer
sorry I don't know
fourteen question answer
Fertilization in flowering plants happens through a process called pollination. Pollination occurs when pollen grains from the anther land on a stigma. ... Fertilization occurs when one of the sperm cells fuses with the egg inside of an ovule. After fertilization occurs, each ovule develops into a seed.
fifteen question answer
Pistil: The seed-bearing or "female" reproductive part of a flower. The pistil is composed of the ovary, the style, and the stigma. The ovary contains the developing seeds, and is connected to the pollen-receiving stigma by the style.