Control & Coordination
Exemplar Problems
Short Answer Questions
Question 34: Label the parts (a), (b), (c) and (d) and show the direction of flow of electrical signals in the following figure.

Answer:
- Sensory neuron
- Spinal cord
- Motor neuron
- Effector
Question 35: Name the plant hormones responsible for the following
- Elongation of cells
Answer: Auxin - Growth of stem
Answer: Giberellin - Promotion of cell division
Answer: Cytokinin - Falling of senescent leaves
Answer: Abscissic acid
Question 36: Label the endocrine glands in the given figure.

Answer:
- Pineal gland
- Pituitary gland
- Thyroid gland
- Thymus
Question 37: In the given figures, (a), (b) and (c), which appears more accurate and why?

Answer: Figure (a) appears more accurate because it is showing positive geotropic movement in roots and negative geotropic movement in stem.
Question 38: Label the parts of a neuron in the given figure.

Answer:
- Dendrites
- Cyton
- Axon
- Axon terminals
Question 39: Match the terms of Column (A) with those of Column (B)
Answer:
Column A | Column B |
---|---|
Olfactory receptors | Nose |
Thermo receptors | Skin |
Gustatoreceptors | Tongue |
Photoreceptors | Eye |
Question 40: What is a tropic movement? Explain with an example.
Answer: Tropic Movement: The movements which are in a particular direction in relation to the stimulus are called tropic movements. Tropic movements happen as a result of growth of a plant part in a particular direction. For example; the shoot usually grows in the direction of sunlight. This is called positive phototropic movement.
Question 41: What will happen if intake of iodine in our diet is low?
Answer: Iodine is an important constituent of thyroxine. Thyroxine governs the rate of general metabolism in the body. Lack of iodine in the diet can hamper general metabolism; which can lead to many complications. Moreover, deficiency of iodine also leads to a condition which is known as goiter. This manifests in the form of a permanent swelling in the neck.
Question 42: What happens at the synapse between two neurons?
Answer: Transmission of nerve impulses between two neurons takes place at through the synapse. The axon terminal of a neuron releases specialized chemicals; called neurotransmitters. These chemicals travel through the synapse and reach the dendrites of the next neuron. The nerve impulses travel along with the neurotransmitters.
Question 43: Answer the following:
- Which hormone is responsible for the changes noticed in females at puberty?
Answer: Oestrogen - Dwarfism results due to deficiency of which hormone?
Answer: Growth hormone - Blood sugar level rises due to deficiency of which hormone?
Answer: Insulin - Iodine is necessary for the synthesis of which hormone?
Answer: Thyroxine
Question 44: Answer the following:
- Name the endocrine gland associated with brain?
Answer: Pineal Gland - Which gland secretes digestive enzymes as well as hormones?
Answer: Pancreas - Name the endocrine gland associated with kidneys?
Answer: Adrenal Gland - Which endocrine gland is present in males but not in females?
Answer: Testis