Immunology Questions Online Test 4
Saturday, March 28, 2020
Thursday, March 26, 2020
MCQs part 2 on Virology
MCQs part 1 on Virology
Friday, October 12, 2018
This is NCERT Based
Biology Online test of chapter
= 5 (Fundamental Unit Of Life)
for practicing of
CBSE Examination of 9th
Class.
Biology Online test of chapter
= 5 (Fundamental Unit Of Life)
for practicing of
CBSE Examination of 9th
Class.
Chapter ( 5 ) - THE FUNDAMENTAL UNIT OF LIFE
TIME : 1 Hour
MARKS : 30
Q.1 Why is the cell called the structural and functional unit of life? 2
Q.2 why is the plasma membrane called a
selectively permeable membrane? 2
Q.3 if the organization of a cell is
destroyed due to some physical or chemical influence, what will happen?
2
Q.4 why are lissome known as suicide
bags? 2
Q.5 How is a prokaryotic cell different from
a eukaryotic cell? 3
Q.6 which organelle is known as the
powerhouse of the cell? Why? 3
Q.7 how does an Amoeba obtain its food? Draw Diagram. 3
Q.8 what is osmosis? What are its types? Explain. 3
Q.9 what would happen if the plasma membrane
ruptures or breaks down? 2
Q.10 Write
differences between Plasma Membrane and Cell Wall. 2
Q.11 Name the two Nucleic Acids present in the
cell. What are their functions? 3
Q.12 Draw Diagram of a Plant Cell and Label it. 3
Saturday, May 12, 2018
Online NCERT Notes on Chapter=7 (Control and Coordination) Part 2
This is Online NCERT Notes on Chapter=7 (Control and Coordination) Part 2 for preparation of CBSE BOARD Examination, NTSE etc.COORDINATION IN PLANTS:
Movements in plants :
(i) Independent of growth
(ii) Dependent on growth
(i) Independent of growth : Immediate response to stimulus.
• Plants use electrical-chemical means to convey information from cell to cell.
• For movement to happen, cells change their shape by changing the amount of water in them, resulting in swelling or shrinking of cells.
E.g., Drooping of leaves of ‘Touch-me-not’ plant on touching it.
(ii) Dependent on growth : These movements are tropic movements i.e., directional movements in response to stimulus.
• Tendrils : The part of tendril away from the object grows more rapidly as compared to the part near the object. This causes circulating of tendril around the object.
• Phototropism : Movement towards light.
• Geotropism : Movement towards/away from gravity.
• Chemotropism : Growth of pollen tube towards ovule.
• Hydrotropism : Movement towards water.
Plant Hormones : Are chemical compounds which help to coordinate growth, development and responses to the environment.
Main plant hormones are :
(a) Auxin :
• Synthesized at shoot tip
• Helps the cells to grow longer
• Involved in phototropism
(b) Gibberellin :
• Helps in the growth of the stem
(c) Cytokinins :
• Promotes cell division
• Present in greater concentration in fruits and seeds
(d) Abscisic Acid :
• Inhibits growth
• Cause wilting of leaves
• Stress hormone
Hormones in Animals :
Hormones : Hormones are the chemical substances which coordinate the activities of living organisms and also their growth.
Endocrine glands : These glands secrete their product (hormone) into the blood. Endocrine Gland, Hormones and their Functions
Endocrine Gland, Hormones and their Functions
Iodised salt is necessary because iodine mineral is essential part of thyroxine hormone secreted by thyroid gland.
Thyroxine regulates metabolism of carbohydrates, fats and proteins.
So, we must consume iodised salt which is necessary for proper working of thyroid gland. It’s deficiency causes a disease called goiter (Swollen neck).
Thyroxine regulates metabolism of carbohydrates, fats and proteins.
So, we must consume iodised salt which is necessary for proper working of thyroid gland. It’s deficiency causes a disease called goiter (Swollen neck).
Diabetes:
Disease in which blood sugar level increase.
Cause : Due to the deficiency of insulin hormone secreted by pancreas that is responsible to control blood sugar levels.
Treatment : Injections of insulin hormone.
Feedback Mechanism:
The excess or deficiency of hormones has a harmful effect on our body.
Feedback mechanism makes sure that hormones should be secreted in precise quantity and at right time.
Feedback mechanism makes sure that hormones should be secreted in precise quantity and at right time.
E.g., Feedback mechanism to control the sugar level in blood is as follows :
Sugar level in the blood rises.
Practice Questions on Chapter=7 (Control and Coordination)
These are Online Practice Questions on NCERT Chapter = 7 (Control and Coordination) for preparation of CBSE BOARD Examination, NTSE etc.QUESTIONS:
VERY SHORT QUESTIONS (1 Mark)
1. Where is auxin synthesized in plants ?
2. Which gland is known as master gland ?
3. Name the hormone that regulates blood sugar level.
4. What is synapse ?
5. What are tropic movements ?
6. Which part of the brain is responsible for maintaining posture and balance of our
body ?
7. Which hormone has inhibiting effects on growth of plants ?
8. What is phototropism ?
9. What are the components of central nervous system ?
10. What happens at synapse between two neurons ?
SHORT ANSWER TYPE QUESTIONS (2 Marks)
1. Draw a labelled diagram of neuron.
2. What is reflex arc ? Explain with the help of flow chart.
3. What is the cause of diabetes ? How it can be controlled ?
4. Why is it advisable to use iodised salt ?
5. What are sensory and motor neurons ? Write their functions.
6. Why is Abscisic acid called as stress hormone ?
7. What is the need for a system of control and coordination in an organization ?
SHORT ANSWER TYPE QUESTIONS (3 Marks)
1. What are plant hormones ? Name a plant hormone that promotes growth in plants.
2. What is the significance of tropic movements in plants ? Explain any two types of
tropic movements.
3. Which hormone is known as emergency hormone in our body ? How it helps in coping
during emergency ?
4. Where are different receptors present in our body ? What are their functions ?
LONG ANSWER TYPE QUESTIONS (5 Marks)
1. Draw a labelled diagram of human brain and state the functions of its different parts.
2. What are hormones ? Give the name of associated gland and functions of different
animal hormones.
3. What is feedback mechanism ? Explain its working with the help of one example.
4. (a) How brain and spinal cord are protected ?
(b) What are the different parts of human nervous system ?
(c) What are the limitations of nervous system ?
VALUE BASED QUESTION
Rahul’s aunt is obese. She is very fond of eating sweets and junk food. She feels very
thirsty and passes excess of urine. She got herself examined by the doctor. Doctor told
her not to eat sweet things and exercise regularly. He prescribed some medicines also.
9. What are the components of central nervous system ?
10. What happens at synapse between two neurons ?
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