Biological Classification — BIOLOGY STD 11 Science — Question

Write any four benefits of frog to mankind.

Differentiate between fibrous joints and cartilaginous joints, with an example for each.

Why is Kreb's cycle also called TCA cycle? Write the first step of the reaction in this cycle.

Water moves up against gravity and even for a tree of 20m height, the tip receives water within two hours. The most important physiological phenomenon which is responsible for the upward movement of water is _______________________.

How are the neurons different from neuroglial cells?

Answer briefly:

1. How does pepsinogen change into its active form?
2. How does bile help in the digestion of fats?

1. How many division take place in meiosis? How many times, the chromosomes replicate during meiotic cell division?
2. How many daughter cells are produced during mitotic cell division and a meiotic cell division?
3. What is the status of chromosomes and DNA content in each daughter cell?

Which one belongs to Platyhelminthes?

1. Schistosoma.
2. Trypansoma.
3. Plasmodium.
4. Wuchereria.

The simplest type of canal system in Porifera is:

1. Ascon type.
2. Leucon type.
3. Sycon type.
4. Radial type.

The clam nervous system is composed of:

1. Labial palps.
2. One pair of ganglia.
3. Two pairs of ganglia.
4. Three pairs of ganglia.