Photosynthesis in Higher Plants — BIOLOGY STD 11 Science — Question

Name the hormones that regulate the following:

1. Control of skin colour.
2. Release of sugar from liver.
3. Widening of pelvis at birth.
4. Leydig's cells of testis.

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.

Where do the protons move during ATP synthesis? How many protons move for the synthesis of one molecule of ATP?

Differentiate between.
Spike and spadix.

Distinguish between :
Vital capacity and Total lung capacity.

What is meant by (a) Cytotaxonomy and (b) Chemotaxonomy respectively?

Avantika, who works in a publication house suffered from severe back pain, for the last three months. She visited a doctor, who explained that it was due to her wrong sitting posture during the office hours. He also suggested her that she should avoid long working hours continuously.

1. List two disorders that may be caused by wrong sitting posture.
2. Write the vertebral formula of humans.
3. What precautions should be taken to avoid such problem?
4. What value is shown by Avantika?

Metamorphosis of insects is regulated through hormone:

1. Pheromone.
2. Thyroxine.
3. Ecdysone.
4. All of these.

Distinguish between :
impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre