I. Fill in the blanks. (1/2 Mark each.)
1. Our standing in attention then we hear our national anthem is a ---
2. In neuron there is --- Sheath on Axon.
3. The mixed gland is ---.
4. Auxin refers to chemical compound ---
5. The substance --- is used in destroying the dicotyledonous weeds.
II. Multiple Choice questions.
1. Cytokinins have special function of promoting
A) the number of flowers
B) cell division
C) the amount of auxins
D) cell destruction
2. The hormone that helps in the implantation of enbryo-
A) Testosterone B) Prolactin
C) Insulin D) Progesterone
3. In diseases like polio, the cells that get destroyed by virus are
A) monocytes B) motor neurons
C) erythrocytes D) sensory neurons
4. The number of pairs of cranial nerves in man are
A) 10 B) 11 C) 12 D) 13
5. The decade 1990-2000 is known as decade of
A) heart B) ear C) eye D) brain
Answers
I. 1) Conditioned reflex
2) Myelin 3) Pancreas
4) Indole acetic acid
5) 2-4 dichlorophenoxy acetic acid
II. 1-B 2-D 3-B 4-C 5-D.
January 5, 2014
10th Biology 4 Marks Important Questions - English Medium
Q: Plant growth substances act together or against each other. Give suitable examples in support of the statement.
A: There are five major types of plant growth substances namely Auxins, Gibberellins,
Cytokinins, Abscisic Acid and Ethylene. Auxins and Gibberellins promote growth and elongation of stems and roots. Ethylene and ABA inhibits it.
Gibberellin promotes internodal elongation and is also used to obtain seedless fruits.
Cytokinins are capable of stimulating cell division and cell elongation.
Abscisic acid inhibits plant growth. It induces dormancy in buds, tubers and seeds, where as gibberellins break seed dormancy. Ethylene is the gaseous substance involved in the ripening of fruits. Cytokinins delay the process of aging leaves but ABA induces leaf shedding.
Q: Write a brief account on Adrenal glands.
A: Adrenal glands are endocrine glands.
There are two adrenal glands.
They are on the top of each kidney like a cap.
It has two parts - the outer cortex and the inner medulla.
Adrenal cortex secretes two hormones cortisol and aldosterone.
Cortisol regulates the metabolism of carbohydrates, proteins and fats.
Aldosterone increases the reabsorption of water and sodium.
Adrenal medulla secretes adrenaline.
Adrenaline helps the body to face during anger, fear or grief.
Hence Adrenaline is called fight or flight hormone.
A: There are five major types of plant growth substances namely Auxins, Gibberellins,
Cytokinins, Abscisic Acid and Ethylene. Auxins and Gibberellins promote growth and elongation of stems and roots. Ethylene and ABA inhibits it.
Gibberellin promotes internodal elongation and is also used to obtain seedless fruits.
Cytokinins are capable of stimulating cell division and cell elongation.
Abscisic acid inhibits plant growth. It induces dormancy in buds, tubers and seeds, where as gibberellins break seed dormancy. Ethylene is the gaseous substance involved in the ripening of fruits. Cytokinins delay the process of aging leaves but ABA induces leaf shedding.
Q: Write a brief account on Adrenal glands.
A: Adrenal glands are endocrine glands.
There are two adrenal glands.
They are on the top of each kidney like a cap.
It has two parts - the outer cortex and the inner medulla.
Adrenal cortex secretes two hormones cortisol and aldosterone.
Cortisol regulates the metabolism of carbohydrates, proteins and fats.
Aldosterone increases the reabsorption of water and sodium.
Adrenal medulla secretes adrenaline.
Adrenaline helps the body to face during anger, fear or grief.
Hence Adrenaline is called fight or flight hormone.
10th Biology Important Questions - 1 and 2 Marks - Control and Coordination
Q: What is reflex arc? Mention the components of it?
A: The structural functional unit that carries out reflex action is called as reflex arc. It consists of a receptor, a sensory nerve, an association neuron, a motor nerve and an effector organ.
Q: What are Nissil granules? Where do you find them?
A: Nissil granules are group of ribosomes and are made up of RNA and proteins. They are
found in the cytoplasm of the cell body of Neuron.
Q: Where do you find the cerebro spinal fluid? What are its functions?
A: A fluid called cerebro-spinal fluid flows in between the outer and middle membranes. This fluid flows from brain to spinal cord and back to brain. It protects brain and spinal cord from injuries and provides nutrients to the cells in brain and spinal cord.
1 Mark Questions
Q: What is irritability?
A: All living organisms respond to changes in environment. This property is called as irritability.
Q: What is action potential?
A: Action potential is a small electrical potential generated at the junction of head and axon of neuron when it is stimulated. This is about 55 milli volts.
Q: Why vagus nerve is more important than others?
A: Vagus nerve controls the heart beat and pancreatic secretions. So it is considered as the most important nerve.
A: The structural functional unit that carries out reflex action is called as reflex arc. It consists of a receptor, a sensory nerve, an association neuron, a motor nerve and an effector organ.
Q: What are Nissil granules? Where do you find them?
A: Nissil granules are group of ribosomes and are made up of RNA and proteins. They are
found in the cytoplasm of the cell body of Neuron.
Q: Where do you find the cerebro spinal fluid? What are its functions?
A: A fluid called cerebro-spinal fluid flows in between the outer and middle membranes. This fluid flows from brain to spinal cord and back to brain. It protects brain and spinal cord from injuries and provides nutrients to the cells in brain and spinal cord.
1 Mark Questions
Q: What is irritability?
A: All living organisms respond to changes in environment. This property is called as irritability.
Q: What is action potential?
A: Action potential is a small electrical potential generated at the junction of head and axon of neuron when it is stimulated. This is about 55 milli volts.
Q: Why vagus nerve is more important than others?
A: Vagus nerve controls the heart beat and pancreatic secretions. So it is considered as the most important nerve.
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