Cell Cycle and Cell Division — BIOLOGY STD 11 Science — Question

Why are less H+ added to HbO as compared to reduced Hb?

Answer the following:

1. Name the stress hormone found in plants.
2. What causes 'bakane' disease of rice?
3. Why do lateral buds start developing into branches, when apical buds are removed?

Differentiate between haplontic and diplontic life cycles.

Name the two types of lymphocytes and write one difference between the two.

Two common characteristics found in centipede, cockroach and crab, are:

1. Book lungs and antennae.
2. Jointed legs and chitinous exoskeleton.
3. Compound eyes and anal cerci.
4. Green glands and tracheae.

The adults are radially symmetrical but larvae exhibit bilateral symmetry in:

1. Mollusca.
2. Echinodermata.
3. Cephalochordata.
4. Hemichordata.

While estimating the age of a tree, what will you observe on the transverse section of its trunk?

Describe the steps of catalytic cycle of an enzyme action. Write any two factors which affect the enzymatic action.

OR

Describe the steps of catalytic action of an enzyme, till the formation of product.

OR

Describe the steps of catalytic cycle of an enzyme action.

Name the site (s) of pyruvate synthesis. Also, write the chemical reaction, wherein pyruvic acid dehydrogenase acts as a catalyst.

Write the floral formula and draw the floral diagram of the family liliaceae.