Body Fluids and Circulation — BIOLOGY STD 11 Science — Question

Label the diagram and also determine the stage at which this structure is visible.

Living state and metabolism are synonyms. Justify.

OR

Without metabolism, there cannot be living state. Justify.

Presence of gills in the tadpole of frog indicates that:

1. Fishes were amphibious in the past.
2. Fishes evolved from frog like ancestors.
3. Frogs will have gills in future.
4. Frogs evolved from gilled ancestors.

What will you look for to identify the sex of the following?

1. Female Ascaris-Sharply curved posterior end.
2. Male frog-A copulatory pad on the first digit of the hind limb.
3. Female cockroach-Anal cerci.
4. Male shark-Claspers borne on pelvic fins.

Expand the following:

1. NAAL
2. IBA
3. 2, 4-D
4. ABA

Describe the incomplete double circulation with an example.

Anurag and Amit (students of class XIth) were best friends, one day during the lunch time Anurag gave naashpati (Pyrus) to Amit (as he was fond of that). Amit refused to eat it because he did not like them due to their hardness as compared to apples. Anurag reached home and told her mother (a botanist) that he will also not eat naashpati's. His mother corrected him and told him that he should eat it, as it contains the calcium for the growth of the body.

1. What is the reason for the difference in the softness in apple and naashpati fruits?
2. What are sclereids?
3. What values are inferred from mother's of Anurag's character?

What will happen if the stretch receptors of the urinary bladder wall are totally removed? Explain.

What is the importance of plasma proteins?

What is meant by alternation of generation? Explain.