Animal Kingdom — BIOLOGY STD 11 Science — Question

Write short notes on:

1. Kingdom Plantae.
2. Kingdom Animalia.
3. Bacteria.
4. Lichens.

What are proteins? How are proteins formed? Describe the primary, secondary and tertiary structures of proteins.

OR

How are proteins formed? Describe the primary, secondary and tertiary structures of proteins.

What is an electrocardiogram? What do P wave and QRS complex represent in a standard ECG?

Explain in brief the central nervous system of frog.

Draw labelled diagrams of.
Female and male thallus of a liverwort.

Class XI biology students attended a seminar where the speaker explained the students about the basic macromolecule found in the body, i.e., protein. He started with the monomer unit of protein and explained about different amino acids found. As amino acids are organic compounds containing an amino group and an acidic group as substituents on the same carbon; they are also considered as substituted methane. Suddenly, Ajay stood up and asked about his queries based on the topic. The guest of seminar patiently explained him all the things. Ajay became satisfied and returned home happily from the seminar.

1. What are the four substituent groups in an amino acid?
2. Why are there so many different types of amino acids?
3. Give the general formula of a-amino acids.
4. Indicate the value of Ajay reflected from the above topic.

What are plasmids? Describe their role in bacteria.

What is the general structure of Pteridophytes?

Explain the main characteristics of pteridophytes.

Explain heart sounds.