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Veins are thin walled and have valves. Justify Veins are thin walled and have valves. Justify

Veins are thin walled and have valves. Justify
Veins are thin walled and have valves. Justify

Grade:10

22 Answers

Gaurav Yadav
406 Points
one month ago
Hey student.
 
Veins have thin walls because the blood there is no longer under pressure and they have valves to ensure blood flow in one direction.
 
This is the answer to your question. Hope this helps you.
Nandini Sharma
25 Points
one month ago
How is the wall of small intestine adapted for performing the function of absorption of food?
How is the wall of small intestine adapted for performing the function of absorption of food?
Gaurav Yadav
406 Points
one month ago
Hey student.
 
The inner lining of the small intestine has numerous finger-like projections called villi which increase the surface area for absorption.
 
This is the answer to your question. Hope this helps you.
Nandini Sharma
25 Points
one month ago
Out of a goat and a tiger, which one will have a longer small intestine? Justify your answer.
Out of a goat and a tiger, which one will have a longer small intestine? Justify your answer.
Gaurav Yadav
406 Points
one month ago
Hey student.
 
Goat because herbivores eating grass need a longer small intestine to allow the cellulose to be digested.
 
This is the answer to your question. Hope this helps you.
Nandini Sharma
25 Points
one month ago
Explain how ozone being a deadly poison can still perform an essential function for our environment
Explain how ozone being a deadly poison can still perform an essential function for our environment
Gaurav Yadav
406 Points
one month ago
Hey student.
 
The ozone layer protects us from the harmful effects of UV radiation.
 
 
This is the answer to your question. Hope this helps you.
 
Nandini Sharma
25 Points
one month ago
Give reason why a food chain cannot have more than four trophic levels
Give reason why a food chain cannot have more than four trophic levels
Gaurav Yadav
406 Points
one month ago
Hey student.
 
The loss of energy at each step is so great that very little usable energy remains after four trophic levels.
 
This is the answer to your question. Hope this helps you.
Nandini Sharma
25 Points
one month ago
State the role of pancreas in digestion of food.
State the role of pancreas in digestion of food.
State the role of pancreas in digestion of food.
Gaurav Yadav
406 Points
one month ago
Hey student.
 
The pancreas secretes digestive juice which contains enzymes like trypsin for digesting proteins and lipase for breakdown of emulsified fats. 
 
This is the answer to your question. Hope this helps you.
Nandini Sharma
25 Points
one month ago
Assertion: After white washing the walls, a shiny white finish on walls is obtained after two to three days. Reason: Calcium Oxide reacts with Carbon dioxide to form Calcium Hydrogen Carbonate which gives shiny white finish.
Gaurav Yadav
406 Points
one month ago
Hey student.
 
c) Assertion is True & Reason is False
 
This is the answer to your question. Hope this helps you.
Nandini Sharma
25 Points
one month ago
Assertion: Food chain is responsible for the entry of harmful chemicals in our bodies. Reason: The length and complexity of food chains vary greatly
Gaurav Yadav
406 Points
one month ago
Hey student.
 
b) Both Assertion & Reasoning are correct, Reason is not the correct explanation of Assertion
 
This is the answer to your question. Hope this helps you.
Nandini Sharma
25 Points
one month ago
Assertion: Greater number of individuals are present in lower trophic levels. Reason: The flow of energy is unidirectional.
Gaurav Yadav
406 Points
one month ago
Hey student,
 
b) Both Assertion & Reasoning are correct, Reason is not correct explanation of Assertion
 
This is the answer to your question. Hope this helps you.
Gaurav Yadav
406 Points
one month ago
Hey student.
 
a) Both Assertion & Reasoning are correct & Reason is the correct explanation of Assertion
 
This is the answer to your question. Hope this helps you.
Nandini Sharma
25 Points
one month ago
Energy in the case of higher plants and animals is obtained by a) Breathing b) Tissue respiration c) Organ respiration d) Digestion of food
Gaurav Yadav
406 Points
one month ago
Hey student.
 
b) Tissue respiration
 
This is the answer to your question. Hope this helps you.
This is the answer to your question. Hope this helps you.
Nandini Sharma
25 Points
one month ago
Which of the following correctly represents the decreasing order of metallic character of Alkali metals plotted in the graph? a) Cs>Rb>Li>Na>K b) K>Rb>Li>Na>Cs c) Cs>Rb>K>Na>Li d) Cs>K>Rb>Na>Li
 
Gaurav Yadav
406 Points
one month ago
Hey student.
 
c) Cs>Rb>K>Na>Li
 
This is the answer to your question. Hope this helps you.This is the answer to your question. Hope this helps you.

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