Answer: Option C. -> 1-ii, 2-i, 3-iii
:
C

The rearranged words are as follows:

1. DWARFISM

2. OESTROGEN

3. THYROXINE

• Dwarfism is a condition that occurs as a result of deficiency of growth hormone in childhood.


• Oestrogen is the hormone secreted in females at puberty. Oestrogen plays a role in the development of so-called female secondary sex characteristics, such as breasts, wider hips, pubic hair and armpit hair.


• Thyroxine is the hormone which regulates carbohydrate, protein and fat metabolism in the body. It plays a crucial role in heart and digestive function, metabolism, brain development, bone health and muscle control. 

 

Answer: Option B. -> At the shady side of the shoot.
:
B
When growing plants detect light, a hormone called auxin, synthesised at the shoot tip, 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.

Answer: Option C. -> Nerve impulse
:
C
  $\bullet$ Nerve impulses are simply signals that are transmitted along nerve fibres (or neurons). It is the process by which neurons communicate with one another.
  $\bullet$ The transmission of a nerve impulse along a neuron from one end to the other occurs as a result of difference in electrical charges across the membrane of the neuron.
  $\bullet$ Nerve impulses can travel very quickly because they are electrical impulses.

Answer: Option A. -> Touching the hot pan
:
A
In the given case, touching the hot pan is the stimulus and pulling the hand back is the response.

Answer: Option B. -> Phototropism
:
B

Phototrophic movement is the growth of a plant in response to light.
If the plant part grows towards light, it is called positive phototropism, and if the plant part grows away from light, it is called negative phototropism. The shoot of a plant shows positive phototropism and the root of a plant shows negative phototropism.

Answer: Option C. -> Diabetes 
:
C

Diabetes is caused by a deficiency of the pancreatic hormone insulin, which results in a failure to metabolize sugars and starch. Sugars accumulate in the blood and urine since they are not used by the cells due to lack of insulin.

Answer: Option B. -> Reduced production of growth hormone
:
B
One of the main hormones produced by pituitary is the growth hormone. This hormone is responsible for growth of the body. Excessive secretion of growth hormone causes gigantism and lack of growth hormone in a developing child causes dwarfism.

Answer: Option B. -> Blood pressure
:
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.

Answer: Option B. -> (i) – (ii) – (iii)
:
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.

Answer: Option D. -> diffusion of auxins towards the shady side of shoot.
:
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.