CBSE 11TH BIOLOGY - Online Test
Q1. The specialized centre which can reduce the inspiratory duration upon stimulation is
Answer : Option C
Explaination / Solution:
The pneumotaxic centre can moderate the functions of the respiratory rhythm centre. Neural signal from this centre can reduce the duration of inspiration and thereby alter the respiratory rate.
Q2. Glucose will be lost in the urine of patients suffering from :
Answer : Option C
Explaination / Solution:
Glucose will be lost in the urine of patients suffering from diabetes mellitus. It a chronic lifelong condition that affects our body ability to use the energy found in blood.
Q3. The presence of milk producing glands is a unique characteristic feature of class
Answer : Option D
Explaination / Solution:
Mammalia are found in a variety of habitats – polar ice caps, deserts, mountains,forests, grasslands and dark caves. Some of them have adapted to fly orlive in water. The most unique mammalian characteristic is the presenceof milk producing glands (mammary glands) by which the young onesare nourished. They have two pairs of limbs, adapted for walking, running,climbing, burrowing, swimming or flying.
Q4. Which of the following statements are not correct?
Answer : Option D
Explaination / Solution:
A nucleic acid containing deoxyribose is called deoxyribonucleic acid (DNA) while that which contains ribose is called ribonucleic acid (RNA).
Q5. For a healthy individual, calculate stroke volume for him if other values are; heart beat per minute = 72 and cardiac output is 5 litre?
Answer : Option B
Explaination / Solution:
E Stroke volume of healthy individual can be calculated by dividing cardiac output by number of heart beat per minute. So stroke volume = 5/ 72 = 0.0694.
Q6. Energy releasing enzymatically controlled catabolic process which involves step-wise oxidative breakdown of organic substance inside living cells is called
Answer : Option B
Explaination / Solution:
Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.
Q7. Synapsis occurs between
Answer : Option C
Explaination / Solution:
Synapsis occur between two homologous chromosome during zygotene phase of prophase of meiosis I due to presence of synaptonemal complex between homologous chromosomes.
Q8. People with chronic kidney disease are usually affected by anemia. It happens because damaged kidney doesn’t secrete sufficient :
Answer : Option A
Explaination / Solution:
The person suffering from chronic kidney disease are usually affected by anemia. The damage kidney is not able to secrete sufficient erythropoietin in blood that help in absorption of iron.
Q9. In Barley stem, vascular bundles are
Answer : Option B
Explaination / Solution:
The vascular bundles in Hordeum vulgare (barley) plant are scattered in ground tissues, many in number and vary in size-smaller towards periphery and bigger towards centre of the ground tissue, oval or rounded in outline, conjoint, collateral and closed.
Q10. Which is the incorrect statement from the following?
Answer : Option D
Explaination / Solution:
Lion (Pantheraleo), leopard (P. pardus) and tiger (P. tigris) with several common features, are all species of the genus Panthera. The genus Felisincludes cats. Hence, the correct option is Lion, tiger, leopard and cat belong to the same genus.
