Neural Control and Coordination — BIOLOGY STD 11 Science — Question

1. Mention the two factors/reasons for the increase in the osmolarity of filtrate from the cortex to the inner medullary interstitium.
2. Give the values of osmolarity of filtrate in the nephron in (i) the cortex and (ii) inner medulla, respectively.

Due to some physiological reasons the blood glucose level of an otherwise normal person has risen above normal. How will this condition be returned to normal through hormone action?

Describe the structure of a leaf.

How is a botanical garden different from a museum? Name any two famous botanical gardens in India.

State what will happen if plants are supplied with,

1. Low content of nitrogen.
2. Excess of sulphur.

When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm and an angiosperm?

Water-Vascular system is found in:

1. Sea-anemone.
2. Sea-pen.
3. Sea-cucumber.
4. Sea-horse.

It is absolutely not necessary to produce amylase in an inactive form in our body, but it is not so, in the case of trypsin. Give reason.

How is simple diffusion different from active transport?

A certain tree is believed to be releasing oxygen during night time. Do you believe in the truthfulness of this statement? Justify your answer by giving the reason.