Q. Reflex arcs are evolved in animals for quick and efficient responses. Which one of the following sequences correctly represents a reflex arc?
1) Receptor - Sensory neuron - Relay neuron in spinal cord - Brain - Motor neuron - Effector
2) Receptor - Sensory neuron - Brain - Relay neuron in spinal cord - Motor neuron - Effector
3) Receptor - Motor neuron - Relay neuron in spinal cord - Sensory neuron - Effector
4) Receptor - Motor neuron - Brain - Sensory neuron - Effector
Q. Which of the following is essential for the thyroid gland to make thyroxin?
1) NaCl
2) KCl
3) Cholesterol
4) Iodine
Q. In plant cells, RNA is present in -
1) cytoplasm only
2) nuclei and cytoplasm only
3) nuclei, cytoplasm, mitochondria, chloroplast and endoplasmic reticulum
4) nuclei, cytoplasm, mitochondria, chloroplast and ribosomes
Q. In grasses, the intercalary meristem is usually located at -
1) root tip
2) lateral sides of stem
3) base of leaves
4) shoot tip
Q. Xylem is a type of complex tissue in plants for the upward conduction of water. Which one of the following xylem tissues consists of living cells?
1) Tracheid
2) Vessel
3) Xylem parenchyma
4) Xylem fibre
Q. "Brucellosis" is a disease caused by -
1) Bacteria
2) Virus
3) Fungus
4) Protozoa
Q. Which of the following viruses was assessed to be responsible for the highly infectious disease of smallpox?
1) Adenovirus
2) Aichi virus
3) Variola virus
4) Coxsackie virus
Q. Camellia sinensis is a plant that produces -
1) tea
2) coffee
3) jute
4) sugarcane
Q. Which of the following is a characteristic of permanent tissue?
1) Cells divide repeatedly
2) Inorganic inclusions are absent
3) Intercellular spaces are present
4) Vacuoles are absent
Q. Which gland in the human body acts both as an endocrine and exocrine gland?
1) Liver
2) Pancreas
3) Pituitary
4) Thyroid Gland
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