MODEL PAPER 3 — BIOLOGY STD 11 Science — Question

Write an account on modes of respiration in animals with examples.

Answer the following questions in respect of cockroach:

1. What is meant by paurometabolous?
2. What is the function of gizzard and malpighian tubules?
3. Write the scientific name of cockroach.

Distinguish between the following: Interfasicular cambium and intrafasicular cambium.

What is the most common liverwort? Draw itswell-labelled diagram. What is the nature of itsthallus?

1. What is the effect of substrate concentration on the action of enzyme?
2. Distinguish between apoenzyme and coenzyme.
3. Why are amino acids also called substituted methane?

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.

State the condition in which the flowers are described.

1. Perigynous.
2. Epigynous and.
3. Hypogynous.

Give one example of each plant in whih these flowers are found.

What are histones? What are their functions?

Differentiate between right ventricle and left ventricle.