CBSE 11TH BIOLOGY - Online Test
Q1.
T 3
Thyroid gland do not secrete
Answer : Option C
Explaination / Solution:
Melatonin hormone is secreted by Pineal Gland.
Q2. The morphological changes are indicative of certain element deficiencies and are called
Answer : Option B
Explaination / Solution:
Deficiency symptoms are morphological changes in plants, indicating nutrient deficiency. Deficiency symptoms vary from one element to another.
Q3. Digestion can be defined as :
Answer : Option C
Explaination / Solution:
Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules so that they can be absorbed into the watery blood plasma.
In certain organisms, these smaller substances are absorbed through the small intestine into the blood stream.
Q4. Due to refractory period , a nerve fibre in human body on an average transmits about :
Answer : Option B
Explaination / Solution:
Refractory period is the time taken to nerve become ready to conduct other impulse. Due to this refractory period, a nerve fibre in human body on an average transmits about 1000 impulses per seconds.
Q5. The process of fusion between one large and non-motile female gamete with smaller, motile male gamete is termed as
Answer : Option D
Explaination / Solution:
Fusion between one large, non-motile female gamete and a smaller, motile male gamete is termed as oogamous e.g., Volvox, Fucus.
Q6. The photograph or diagram of metaphasic chromosome arranged in homologous pair according to their length and thickness, position of centromere is called
Answer : Option D
Explaination / Solution:
Idiogram is a diagrammatic or systematized representation of the chromosome complement of an individual, species, or other group of organisms, indicating the number of chromosomes and their lengths, arm length ratio, centromere position, banding pattern.
Q7.
PGA as the first fixation product was discovered in photosynthesis of
Answer : Option B
Explaination / Solution:
The pathway of photosynthesis was discovered by Melvin Calvin after experiment on single celled algae. The first stable product of C3 cycle is a three carbon compound called PGA (phosphoglyceric acid).
Q8. Respiration in insects is direct due to exchange of gases
Answer : Option C
Explaination / Solution:
Insects have spiracles on their exoskeletons to allow air to enter the trachea. In insects, the tracheal tubes primarily deliver oxygen directly into the insects' tissues. The spiracles can be opened and closed in an efficient manner to reduce water loss. This is done by contracting closer muscles surrounding the spiracle.
Q9. Air bladder is present in
Answer : Option A
Explaination / Solution:
Air bladder is present in Actinopterygii. It is also known as ray finned fish due to presence of fin rays.
Q10. In yeast, during fermentation the glycolysis pathway leads to
Answer : Option B
Explaination / Solution:
Yeast cells obtain energy under anaerobic conditions using a very similar process called alcoholic fermentation.
Glycolysis is the chemical breakdown of glucose to lactic acid. Alcoholic fermentation is identical to glycolysis except for the final step.
In alcoholic fermentation, pyruvic acid is broken down into ethanol and carbon dioxide.
