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

Write the name of units of these flower parts.

1. Calyx.
2. Corolla.
3. Androecium.
4. Gynoecium.

If the olecranon process of the human radioulna bone is removed, what effect will it have?

Mucus helps frog in forming:

1. Thick skin.
2. Dry skin.
3. Smooth skin.
4. Moist skin.

Where does the urine formation take place? Name the processes involved in the formation of urine.

Kavita (student of class VIII) returned from the school and started counting her teeth. She felt surprised and counted her teeth two more times, but each time she count, she found her teeth to be 28 in number. Then, she started counting his younger brother (student of class I) teeth and found them to 20 in number. She rushed to his father who was a dentist and told him, that her teacher taught her that human beings have 32 teeths. But she has only 28 and his brother has 20. Her father explained that number of teeth are related to the age of a child and also told her about diphyodont and heterodont dentition.

1. How is number of teeth related to the age of a child?
2. At what age, a person gets 32 teeth?
3. What do you understand by heterodont and diphyodont?
4. What values are reflected from Kavita's behaviour?

Distinguish between cranial nerves and spinal nerves.

Damage to medulla can cause death. Justify the statement.

Which of the following is an incorrect statement?

1. There is a common opening for both digestive system and excretory system in Aves.
2. Forelimbs are modified for flight in Bats.
3. Bioluminescence is also shown by an insect.
4. Open digestive system is more advanced than the closed digestive system.