CBSE 11TH BIOLOGY - Online Test

Q1. Taxon is a
Answer : Option B
Explaination / Solution:

Each category in taxonomic hierarchy represents a rank and is commonly termed as taxon. Hence, the correct option is Ranking.

Q2. Actin filaments are found in all eukaryotic cells but reportedly absent in :
Answer : Option C
Explaination / Solution:

Actin filament help in contraction and relaxation of muscles. Actin filament are found in all eukaryotic cells but it is absent in nematode sperms.

Q3. Root hairs absorb water from soil with the help of
Answer : Option C
Explaination / Solution:

Root hairs absorb water from soil with the help of suction pressure created due to concentration difference of water and mineral ions present in soil.

Q4. The epithelium found in the lining of stomach and intestine is
Answer : Option B
Explaination / Solution:

The columnar epithelium is found in the lining of stomach and intestine and help in secretion and absorption. It also provides barrier against harmful micro organisms.

Q5. Which among the five kingdom system of classification do not possess nuclear membrane?
Answer : Option A
Explaination / Solution:

Kingdom Protista, kingdom Fungi, kingdom Plantae possess nuclear membrane while kingdom Monera do not possess nuclear membrane.

Q6. By chemical nature, hormones are never :
Answer : Option A
Explaination / Solution:

Hormones are generally protein components having amino acids as well as steroids. Hormones are generally not monosaccharide derivatives in nature.

Q7. Which is an important constituent of protein involved in transfer of electrons?
Answer : Option D
Explaination / Solution:

Plants obtain iron in the form of ferric ions (Fe3+). It is required in larger amounts in comparison to other micronutrients. It is an important constituent of proteins involved in the transfer of electrons like ferredoxin.

Q8.

Complete the following reaction :

  • Maltose — Maltase → Glucose + i
  • Lactose — Lactase → Glucose + ii
  • Sucrose — Sucrase → Glucose + iii
Answer : Option D
Explaination / Solution:

Maltose in presence of maltase produce two molecules of glucose. Lactose in presence of lactase produce glucose and galactose. Sucrose in presence of sucrose produce glucose and fructose.

Q9. In the prosencephalon, first and second ventricles open into third ventricle by :
Answer : Option D
Explaination / Solution:

In prosencephlon, the first and second ventricles open into third ventricles by foramen of Monro. It is the opening that connects the left and right sides of lateral ventricle in brain.

Q10. Kelps are
Answer : Option D
Explaination / Solution:

Kelps are marine algae of class phaeophyceae or brown algae. The body of kelp may reach upto 100 meter long. They vary in colour from olive green to various shades of brown depending upon xanthophyll pigments , fucoxanthin present in them.