LGS Mixed Practice Test #313

Question 1

A recessive allele expresses only when:

Accepted Answer

Present in both chromosomes (homozygous) — Recessive trait appears only in aa genotype.

Answer

One copy is present

Answer

Dominant allele is also present

Answer

Never

Question 2

In the 'Elaborate' stage of the 5E learning model, what is the primary role of the teacher?

Accepted Answer

D. To challenge students to apply learned concepts to new, complex situations. — During the Elaborate stage, the teacher's primary role is to extend student understanding by challenging them to apply the concepts learned in new, real-world contexts or solve more complex problems. Option A describes the Engage stage, option B describes the Explain stage, and option C relates to the Evaluate stage.

Answer

A. To introduce a new topic and capture students' interest.

Answer

B. To provide direct instruction on formal concepts and vocabulary.

Answer

C. To assess student understanding through summative tests.

Question 3

Hard water contains dissolved:‌​‍

Accepted Answer

Calcium and magnesium salts — Hard water has Ca²⁺/Mg²⁺ from limestone — makes soap less effective, forms scum.‌​‍

Answer

Iron oxide

Answer

Potassium salts

Answer

Sodium salts

Question 4

Scholasticism, which dominated medieval thought, was closely tied to:

Accepted Answer

Christian theology — Scholasticism prioritised divine knowledge and the afterlife over worldly inquiry.

Answer

Ancient Greek philosophy

Answer

Islamic scholarship

Answer

Scientific rationalism

Question 5

A tornado is characterised by:‌​‍

Accepted Answer

Funnel-shaped rotating wind — A tornado is a violently rotating column of air (funnel) extending from a thunderstorm to the ground.‌​‍

Answer

Wide area of rain

Answer

Gentle breeze

Answer

Snowfall

Question 6

P-8I aircraft:‌​‍

Accepted Answer

Maritime patrol — Maritime reconnaissance.‌​‍

Answer

Transport

Answer

Fighter

Answer

Trainer

Question 7

The basic unit of the nervous system is the:‌​‍

Accepted Answer

Neuron — Neurons conduct electrical impulses; consist of cell body, axon, dendrites.‌​‍

Answer

Bone cell

Answer

Muscle fibre

Answer

Blood cell

Question 8

The bicarbonate buffer system is the most important extracellular buffer in human blood. Which chemical species primarily constitute this buffer system to maintain pH homeostasis?

Accepted Answer

C. Carbonic acid (H2CO3) and bicarbonate ions (HCO3-) — The bicarbonate buffer system consists of carbonic acid (H2CO3) as the weak acid and its conjugate base, bicarbonate ions (HCO3-). This system effectively neutralizes excess acids and bases, playing a critical role in maintaining blood pH within a narrow physiological range. While other buffer systems exist, the carbonic acid/bicarbonate system is the primary extracellular buffer.

Answer

A. Phosphate ions and proteins

Answer

B. Hemoglobin and plasma proteins

Answer

D. Ammonia and ammonium ions

Question 9

Goitre results from deficiency of:‌​‍

Accepted Answer

Iodine — Thyroid gland enlarges due to insufficient T3/T4 synthesis. ‌​‍India's National Iodine Deficiency Programme.

Answer

Calcium

Answer

Vitamin D

Answer

Iron

Question 10

'Paithalmala' is situated in which district?

Accepted Answer

Kannur — Paithalmala is the highest peak in Kannur district (c. 1372 m).

Answer

Kasaragod

Answer

Kozhikode

Answer

Wayanad

LGS Mixed Practice Test #313