CBSE 11TH BIOLOGY - Online Test
Q1. Which one is not a characteristic feature of prokaryotes?
Answer : Option D
Explaination / Solution:
Prokaryotic organisms generally do not reproduce by sexual reproduction in favorable conditions. The most common method of reproduction is asexual.
Q2. Read the following :
i. Major pineal hormone is melatonin.
ii. In human beings, melatonin secretion increases in light and decreases in dark.
iii. Abnormally high levels of melatonin in children causes delayed sexual development.
Answer : Option A
Explaination / Solution:
Melatonin is a hormone secreted by the pineal gland in the brain. In helps regulate other hormones and maintains the body circadian rhythm. Abnormally high levels of melatonin is children causes delayed sexual development.
Q3. Plants with Zinc deficiency show reduced biosynthesis of
Answer : Option A
Explaination / Solution:
Plants with Zinc deficiency show reduced biosynthesis of Auxin. Auxin play most important role in growth and elongation of plants by cell division and cell differentiation.
Q4.
Match the following:
| Nutrient | Absorbable Forms |
| a) Carbohydrate | i) Amino acids |
| b) Nucleic acid | ii) Monosaccharides |
| c) Proteins | iii) Sugar and bases |
| d) Lipids | iv) Fatty acids and glycerol |
Answer : Option B
Explaination / Solution:
Carbohydrate are converted into monosaccharides, nucleic acid are converted into sugar and bases by nucleosidases, proteins are converted into amino acids by dipeptidases and lipids are converted into fatty acids and glycerol by lipases.
Q5. Vermis is a portion of :
Answer : Option B
Explaination / Solution:
Cerebral vermis is located in the medial, cortico-nuclear zone of the cerebellum. It is constricted between lobe of cerebellum.
Q6. An algae with ribbon shaped chloroplast
Answer : Option B
Explaination / Solution:
Spirogyra is an algae that have long thread like structure having ribbon shaped chloroplast. Spirogyra is found in stagnant water forming green layer around the surface called pond scum.
Q7. The rod shaped bacteria is called as
Answer : Option B
Explaination / Solution:
The shapes of bacteria are bacillus (rod like), coccus (spherical), vibrio (comma shaped) and spirillum (spiral).
Q8. Name the photosynthetic pigment which can be converted to Vitamin A?
Answer : Option D
Explaination / Solution:
The photosynthetic pigment Beta-carotenes can be converted to Vitamin A. carrot contain large quantity of carotenes that can be converted into vitamin A.
Q9. Which part of our respiratory system doesn’t need ciliated epithelium and thus have non-ciliated walls ?
Answer : Option D
Explaination / Solution:
Respiratory system does not need ciliated epithelium and thus have non-ciliated walls such as alveoli. Alveoli are the balloon like structure at which exchange of gases takes place.
Q10. An egg laying animal grouped under mammals is
Answer : Option A
Explaination / Solution:
Most of the animals belonging to class mammalia are viviparous, produces young ones. But, Duck-billed platypus belongs to mammalian class but lay eggs.
