Transport in Plants — BIOLOGY STD 11 Science — Question

Mention the components of the diffusion membrane of human respiratory system. What is its total thickness?

Differentiate between absolute growth rate and relative growth rate.

What are mesosomes and what its use in bacterial cell?

Pneumatic bones are expected to be found in:

1. Pigeon.
2. House lizard.
3. Frog’s tadpole.
4. Flying fish.

Stratified epithelial cells have limited role in secretion. Justify their role in our skin.

From where the given structures originate?

1. Axon.
2. Osteocytes.
3. Chondroblasts.
4. Tendons.

1. Why can cytokinesis not occur in plant cells the same way as it occurs in animal cells?
2. How is it accomplished in plant cells?

Explain what is meant by the terms auxin precursors, anti-auxins, free auxins and bound auxins.

In Opuntia the stem is modified into a flattened green structure to perform the function of leaves (i.e., photosynthesis). Cite two other examples of modifications of plant parts for the purpose of photosynthesis.

In which groups of animals is radial symmetry seen? Is there any interrelationship among all such associations from evolutionary point of view? Explain with example.