Explore topic-wise InterviewSolutions in .

1. In [Ni(H₂O)₆]²⁺ , Ni is in +2 oxidation state with the configuration 3d⁸ , i.e., it has two unpaired electrons which do not pair up in the presence of weak H₂O ligand. Hence, it is coloured. The d – d transtion absorbs red light and the complementary light emitted is green.

2. In the case of [Ni(CN₄)]^2- Ni is again in +2 oxidation state with the configuration 3d⁸, but in the presence of strong CN^- ligand the two impaired electrons in the 3d orbitals pair up. Thus there is no unpaired electron present. Hence it is colourless. Therefore, a solution of [Ni(H₂O)₆]²⁺ is green, whereas a solution of [Ni(CN₄)]^2-is colourless.

Stumps: The bottom part of a tree left projecting from the ground after most of the trunk has fallen or been cut down.

The Greeks believed that all functions of the body were controlled by the brain, since damage to that organ produced remarkable changes in behaviour.

Nerves are classified mainly into three types.

1. Afferent neurons 

2. Efferent neurons 

3. Association neurons.

1. Forebrain 

2. Mid brain and 

3. Hind brain.

The parts of the central nervous system are brain and spinal cord.

Nervous system is divided into two types. They are central nervous system and peripheral nervous system.

(B) Cytokinins

(C) Cytokinins

Reflex action save us from painful or dangerous stimuli.

The sweet smell of ripen fruits is due to Ethylene

Reflex action is a quick involuntary response to a stimulus by an effector. 

e.g: Withdrawing our hand from hot object, blinking of eyelids when a moving object approaches eye.

The receptor of taste is gustatory receptor and that of smell is olfactory receptor.

The directional growth movement of a plant part in response to the touch of an object is called thigmotropism.

Tissues or organs on which hormones act are called target tissues or organs.

The main cells of the nervous system are the neurons. Besides the neurons the nervous system also consists of glial cells.

(a) [CO (NH₃)₃ (Cl₃)] 

A) Both a & b are true

(A) Sensory Nerve

(A) Charles Darwin

Answer is (B) 2 – 4 – D

B) protect from grazers

Answer is (C) Bones

Answer is (C) Balance

i) After blood test it was found that level of glucose (Fasting) is 120 whereas the normal range is 60 -100. After lunch the level of glucose in blood of Rangaiah further raised to 220, the normal being between 160 – 180. This shows that Rangaiah is diabetic.

ii) We can know about bilirubin by blood test.

iii) It shows that Rangaiah is diabetic and his systolic pressure is slightly high. The levels of bilirubin in blood also slightly high, almost normal range. Urine test shows sodium levels are at normal range but 24 hours protein is much higher than normal levels.

iv) 

1. What are symptoms shown by Rangaiah as diabetic patient? 

2. What are the ways to control sugar in the blood? 

3. Which hormone is responsible for raise of glucose in the blood? 

4. How sodium maintains blood pressure at normal levels? 

5. What is the role of bilirubin in digestion?

a) Cerebrum

b) Cerebellum

c) Olfactory Lobes

d) Diencephalon

e) Cerebrum

f) Cerebrum

g) Cerebellum

h) Olfactory Lobes

(C) Analysis – Response

Responses are brought about by rapid changes in some muscle.

Rapidity of response indicates an efficient communication system linking those parts that pick up stimuli to those that trigger a response.

Response is a effect of a change in the environment of the organism or signals of change or stimuli.

1. The stimulus of touch causes the response in a sensitive plant Mimosa pudica. 

2. Droping of the leaves takes place due to change in osmotic pressure at the base of the leaf. 

3. When the stimulus is over, the osmotic pressure increases causing the leaf to become normal. 

4. This is not a growth related movement. 

5. It is not connected with the direction of the stimulus. 

6. Nerve messages in the form of electrical impulse reaches the leg muscles from the brain. 

7. On reaching the leg muscles, the muscles contract causing the movement of the leg.

Blue, Orange

The colour of [Ti(H₂O)₆]³⁺ is purple

Phthalo blue – a bright blue pigment

(d) [Cr (NH₃)₆]³⁺

(d) [Fe(en)₃]³⁺

(b) Sodiumdithiosulphatoangentate (I)

(A) Sympathetic nervous system

Olfactory lobes are concerned with sense of smell

C) Arachnoid mater

(B) Cerebrum

Answer is (C) Cranium

Answer is (A) Medulla

C) 1 – Cerebrum, 2 – Mid brain, 3 – Cerebellum, 4 – Spinal cord

The parts present in fore brain are cerebrum and diencephalon.

Cerebellum maintains posture, equilibrium and muscle tone.

Cerebellum and medulla oblongata are the parts present in hind brain.

Feedback mechanism: It helps the organism to maintain homeostasis or dynamic equilibrium. Homeostasis is the maintenance of a stable internal state within an organism. It regulates the action of hormones.

The function of feed back mechanism is to regulate the production and release of hormones in the body.