Animal Kingdom — BIOLOGY STD 11 Science — Question

The vertebral column has four articulation points for the four limbs. This is similar to which of the following? What do you understand by ‘spineless’in the literal sense?

1. A four wheeler has four articulation points for the four wheels.
2. A two wheeler has two articulation points for the two wheels.
3. A snake's vertebral column has no articulation point because it has no limb.

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 bract and bracteole.

Cyclic photophosphorylation results in the production of ATPs and not NADPH. Give reasons.

How do you justify the statement that hormones of adrenal medulla are emergency hormones?

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

A process is occurring throughout the day, in ‘X’ organism. Cells are participating in this process. During this process ATP, CO and water are evolved. It is not a light dependent process.

1. Name the process.
2. Is it a catabolic or an anabolic process?
3. What could be the raw material of this process?

Which type of excretion is present in fishes?

1. Ammonotelic.
2. Ureotelic.
3. Urecotelic.
4. None of these.

Write any four characteristics of Pteridophytes.