Biology – Class 11 Practice Test 4

1. Which of these is not present in frog?

Enucleated erythrocytes

Lymphatic system

Renal portal system

Hepatic portal system

2. Based on which of the following, amino acids are classified?

Based on the number of amino and carboxyl groups

Based on the number of ions

Based on the number of hydrogen

Based on the number of carbon atoms

3. Who introduced the concept of Omnis cellula-e cellula?

Antony Von Leeuwenhoek

Theodore Schwann

Rudolph Virchow

Matthias Schleiden

4. The eukaryotic ribosome is 80S. what does this ‘S’ denote?

Segregation coefficient

Supernatant coefficient

Solidification coefficient

Sedimentation coefficient

5. Which among the following is incorrect about RNA?

Each codon will represent a unique amino acid and an amino acid is represented by a unique codon

m-RNA carries the code for protein synthesis in terms of three nucleotide bases called codons

RNA is of 3 types i.e. r-RNA, m-RNA and t-RNA

r-RNA synthesis the proteins and t-RNA will recognize the codons

6. Which is the primary constriction for every visible chromosome?

Histones

Kinetochores

Ribosomes

Centromere

7. What is the function of plasmodesmata in plants?

Connecting the cytoplasm of adjacent cells

Protecting the cells from mechanical stresses

Joining two adjacent plant cell walls

Providing shape to the cells

8. Which among the following is incorrect about cytoskeleton, cilia and flagella?

Cilia is present in large numbers of the body and only one or two flagella are present in an organism

Microtubules are composed of protein actin and microtubules are composed of protein tubulin

Cytoskeleton is the network of minute proteinaceous structure in the cytoplasm and which mainly contains microfilaments and micro tubules

Both flagella and cilia help in movement of the organism

9. Which of these secondary metabolites is useful for human welfare?

Ricin

Gums

Abrin

Curcumin

10. Frogs have a lymphatic system. True or false?

True

False