CBSE 11TH BIOLOGY - Online Test
Q1. 70% of carbondioxide is transported as bicarbonate by the enzyme
Answer : Option A
Explaination / Solution:
An enzyme present in red blood cells, carbonic anhydrase, aids in the conversion of carbon dioxide to carbonic acid and bicarbonate ions. When red blood cells reach the lungs, the same enzyme helps to convert the bicarbonate ions back to carbon dioxide, which we breathe out. It transportes nearly 70% of carbondioxide as bicarbonate.
Q2. A person accidentally got his adrenal gland injured. He died & reports will probably reveal that death was caused due to :
Answer : Option B
Explaination / Solution:
Adrenal cortex is situated along the perimeter of the adrenal gland. The adrenal cortex mediates the stress response through production of aldosterone and cortisol. If a person got injured his adrenal gland may die due to loss of stress response which will be reveled in report.
Q3. Which phylum has comb plates for locomotion as their distinctive feature?
Answer : Option B
Explaination / Solution:
The body of phylum Ctenophora bears eight external rows of ciliated comb plates, which help in locomotion
Q4. Which of the following carries the hereditary information from parents to progeny?
Answer : Option C
Explaination / Solution:
Nucleic acids carry hereditary information and are passed on from parental generation to progeny.
Q5.
Match the following:
column A
a) Atherosclerosis
b) Haemorrhage
c) Heparin
d) Polycythemia
column B
i) Hypotension
ii) High blood pressure
iii) Abnormal increase in RBC count
iv) Anticoagulant
Answer : Option B
Explaination / Solution:
Antherosclerosis leads to high blood pressure, haemorrhage causes hypotension, heparin is used as anticoagulant and polycythemia causes abnormal increase in RBC count.
Q6. Number of glucose molecule required to produce 38 ATP under anaerobic condition is
Answer : Option C
Explaination / Solution:
During anaerobic respiration only two molecules of ATP is produced by each molecules of glucose.
So, 19 glucose molecules are required to produce 38 ATP molecules.
Q7. Small disc like structures that occur in the centromere are
Answer : Option A
Explaination / Solution:
Small disc-shaped structures at the surface of the centromeres are called kinetochores. These structures serve as the sites of attachment of spindle fibres (formed by the spindle fibres) to the chromosomes.
Q8. If kidney tissues are supplied with blood low in oxygen then :
Answer : Option C
Explaination / Solution:
If Kidney tissues are supplied with blood having low oxygen in it then tubular reabsorption get stopped as energy is required for active absorption.
Q9. In which type of placentation, the ovary is unilocularwith a single ovule?
Answer : Option D
Explaination / Solution:
In basalplacentation, the placenta develops at the base of ovary and a single ovule is attached to it,
Q10. Stem of grasses and related plants elongate by the activity of
Answer : Option A
Explaination / Solution:
Grasses belongs to monocotyledonous angiosperms in which secondary growth do not occurs. Plants elongate by the activity of both apical and intercalary meristem.
