Free Control and Coordination 03 Practice Test - 10th Grade
Question 1
The release of adrenaline in our body increases:
Heart rate
Blood pressure
Sugar metabolism
Aggressive behaviour
SOLUTION
Solution : A, B, and C
When you face a dangerous situation, adrenal glands secrete adrenaline, which increases the heart rate and pumps more blood to the skeletal muscles to increase the supply of oxygen to the same. As a result, the blood pressure increases. The amount of glucose in blood increases to provide more energy. Adrenaline increases the heart rate, blood pressure and sugar metabolism in one's body.
Aggressive behaviour is more due to the hormone - testosterone.
Question 2
Plant appears to bend towards light due to __________.
SOLUTION
Solution : D
Auxins are synthesized at the shoot tip and help the cells to grow longer. When light is coming from one side of the plant, auxin diffuses towards the shady side of the shoot. This concentration of auxin stimulates the cells to grow longer on the side of the shoot which is away from light. Thus, the plant appears to bend towards light.
Question 3
Arrange the following activities in the order of the speed (fastest to slowest) in which they take place.
(i) Movement of mimosa when it is touched.
(ii) Movement of sunflower in response to day and night.
(iii) Growth – related movements of plants.
(ii) – (iii) – (i)
(i) – (ii) – (iii)
(iii) – (ii) - (i)
(iii) – (i) – (ii)
SOLUTION
Solution : B
The leaves of a mimosa plant close and droop down immediately after they are touched (thigmotropic movements). Movement of sunflower in response to day and night happens much slowly (phototropic movement). Growth related movements take place even slowly.
Question 4
Which of the following is not an endocrine gland?
SOLUTION
Solution : B and D
- Endocrine glands and exocrine glands are two types of glands in the human body based on absence or presence of ducts.
- Endocrine glands secrete their respective hormones directly into the blood stream i.e., they are ductless glands. For example: Pituitary, adrenal, pancreas, pineal, thyroid glands etc.
- Exocrine glands have ducts to pass their secretions. For example: sweat, salivary, mammary, ceruminous, lacrimal, sebaceous, and mucous glands.
Question 5
Myelin sheath does not conduct electric impulses. The possible reason could be:
Myelin sheath absorbs electric charges passing through it.
Myelin sheath is a poor conductor and thinly layered which allows small charges through it.
It primarily consists of fat reserves which act as perfect insulator.
Scientific mechanism is not understood.
SOLUTION
Solution : C
Mylein sheath which covers the axon with certain gaps between two successive sheaths is composed of fatty material. Myelin with its various components is a perfect insulator and does not allow electric charges to pass through it.
Question 6
The movement of plant due to touch is called
.
SOLUTION
Solution :The movement of plant due to touch is called thigmotropic movement.
Question 7
The ___________ receives, processes, interprets and stores information coming from senses. The __________ handles its input and output.
ANS, CNS
CNS, PNS
SNS, PNS
PNS, CNS
SOLUTION
Solution : B
In our nervous system, the role of the CNS (Central Nervous System) is to receive, process, analyze, interpret and organize the information coming from our primary senses and sends out the messages as instructions for the effector organs. On the other hand, the role of the PNS (Peripheral Nervous System) is to handle and transmit the impulses coming from the senses and going to the effector organs accordingly. SNS amd ANS refers to somatic and autonomic nervous systems respectively.
Question 8
Ethylene is a gaseous plant hormone released outside the plant body.
True
False
SOLUTION
Solution : A
Ethylene is a gaseous plant hormone released outside the plant body, unlike other hormones which are released inside the plant body. This gaseous hormone induces the ripening of fruits.
Question 9
Growth hormone in humans is secreted by __________.
SOLUTION
Solution : C
The pituitary gland is a pea-sized structure located at the base of the brain, just below the hypothalamus, to which it is attached via nerve fibers. One of the main hormones produced by pituitary is the growth hormone. This hormone is responsible for growth of the body.
Question 10
Classify the following hormone as plant hormone (P) or animal hormone (A).
I. Progesterone
II. Thyroxine
III. Auxin
IV. Adrenaline
I – (P), II – (A), III – (P), IV – (P)
I – (A), II – (A), III – (P), IV – (A)
I – (A), II – (A), III – (A), IV – (P)
I – (P), II – (P), III – (P), IV – (P)
SOLUTION
Solution : B
Progesterone is a hormone that is secreted in females and is associated with menstrual cycle and pregnancy.
Thyroxine is a hormone that is secreted by the thyroid gland and regulates the metabolism of carbohydrates, proteins and fats and maintains the balance of growth.
Auxin is a plant hormone and is responsible for the growth of the shoot.
Adrenaline is a hormone secreted in the animal body and it affects the heart rate, dilation of pupils, etc.