Science (English Medium) इयत्ता ११ - CBSE Question Bank Solutions

Protoxylem is the first formed xylem. If the protoxylem lies next to phloem what kind of arrangement of xylem would you call it?

Distinguish between the following:

Exarch and endarch

Match the following with reference to cockroach and choose the correct option

Why earthworm is called the friend of farmer?

Correct the wrong statement from the following:

Muscular layer in the body wall of earthworm is made up of only circular muscles.

Correct the wrong statement from the following:

Typhlosole is the part of intestine of earthworm.

Why nephridia in earthworm that are basically similar in structure classified into three types? Mention the names of each.

Comment upon the gametic exchange in earthworm during mating.

What are gas vacuoles? State their functions?

What is the function of a polysome?

Select an appropriate chemical bond among ester bond, glycosidic bond, peptide bond and hydrogen bond and write against the following.

Polysaccharide ______

Select an appropriate chemical bond among ester bond, glycosidic bond, peptide bond and hydrogen bond and write against the following.

Fat ______

Select an appropriate chemical bond among ester bond, glycosidic bond, peptide bond and hydrogen bond and write against the following.

Water ______

Enzymes are proteins. Proteins are long chains of aminoacids linked to each other by peptide bonds. Aminoacids have many functional groups in their structure. These functional groups are, many of them at least, ionisable. As they are weak acids and bases in chemical nature, this ionization is influenced by pH of the solution. For many enzymes, activity is influenced by surrounding pH. This is depicted in the curve below, explain briefly.

Nucleic acids exhibit secondary structure, justify with example.

Nucleic acids exhibit secondary structure. Describe through Wetson- Crick Model.

Based on the figure given below which of the following statements is not correct?

Energy required for ATP synthesis in PSII comes from ______.

\[\ce{2H2O -> 4H^{+} + O2 + 4e^{-}}\]

Based on the above equation, answer the following questions:

1. Where does this reaction take place in plants?
2. What is the significance of this reaction?

NADP reductase enzyme is located on ______.