CBSE 11TH BIOLOGY - Online Test
Q1. Lactic acid is formed by the process of
Answer : Option C
Explaination / Solution:
Lactic acid is formed by the process of incomplete oxidation of glucose in presence of insufficient oxygen. Lactic acid is formed in muscle cells due to incomplete oxidation to cause cramps.
Q2. Which one is not a significance of meiotic cell division?
Answer : Option B
Explaination / Solution:
Meiosis cell division results in halving of chromosome number in daughter cells, recombination of genes and formation of spores and gametes.
Q3. Rahul is anaemic and few days ago suffered from massive haemorrhage. Now what problems he may face :
Answer : Option D
Explaination / Solution:
If anemic person suffered from massive haemorrhage, the problem he may face includes, very low blood pressure, accumulation of wastes products in body and no glomerular filtration in kidney.
Q4. Individual component of perianth are called
Answer : Option B
Explaination / Solution:
The flowers in which sepals andpetals are not differentiated are called perianth. The individual component of perianth are called Tepals.
Q5. Condensed part of stem which is specialised to take part in sexual reproduction of angiosperm is called
Answer : Option B
Explaination / Solution:
The condensed part of stem which is specializedto take part in sexual reproduction of angiosperms is called flower. Flower produce seeds and fruits for propagation of species.
Q6. Ground tissue consists of
Answer : Option D
Explaination / Solution:
The ground tissue of plants includes all tissues that are neither dermal nor vascular. It can be divided into three classes based on the nature of the cell walls.
Q7. What is the difference between the taxonomic categories of division and phylum?
Answer : Option A
Explaination / Solution:
In case of plants, classes with a few similar characters are assigned to a higher category called division, whereas phylum was used to refer animals. Hence, the correct option is Division refers to plants whereas phylum refers to animals.
Q8.
Identify the cytokinin given below.
Answer : Option B
Explaination / Solution:
Cytokinin is of different types. The cytokinin shown above is of kinetin which promotes cell division. It was isolated by Miller and Skoog from autoclaved herring sperm DNA.
Q9.
Muscular dystrophy is a genetic disorder.
i. It is genetically inherited.
ii. Some people get affected by MD due to mutated dystrophin gene and nutritional defects at the pre-natal age.
iii. Predominantly males are affected by DMD although females can be carriers of it.
iv. Dystrophin is a protein found in tendons.
Answer : Option D
Explaination / Solution:
Muscular dystrophy is a genetic disorder and genetically inherited. It may also occurs due to mutated dystrophin gene and nutritional defects at the pre-netal age. Males are more affected by MD although females can be carriers of it.
Q10. Muscle forming cells are called
Answer : Option C
Explaination / Solution:
The muscle forming cells are called myoblasts cells. Myoblast is a type of embryonic progenitor cell that differentiates to give rise to muscle cells.
