Excretory Products and their Elimination — BIOLOGY STD 11 Science — Question

Distinguish between:
Cardiac muscle and striated muscle.

While teaching cell division in the class, teacher told that during meiosis, the chromosome number is reduced to half of the parent, whereas during mitosis, the number remains the same. Seema was not able to recognise what teacher explained in the class and asked her elder brother, a botany student, the need of reducing chromosomes during gamete formation and what will happen if chromosome number will not reduced to its half. He explained the concept in detail to Seema.

1. In which part of the organisms does meiosis occur?
2. How does meiosis help in evolution?
3. Give the significance of meiosis.
4. What value is expressed in the behaviour of Seema's elder brother?

The glomerular filtrate in the loop of Henle gets concentrated in the descending limb and then gets diluted in the ascending limb. Explain.

Write any four differences between mitosis of animal and plant cells.

Define the term inflorescence. Explain the basis for the different types inflorescence in flowering plants.

Label the following structures labelled as A-F in the diagram.

What is blood circulation system? Explain the difference between single circulation and double circulation.

A group of plants lacks photorespiration. Answer the following questions based on these plants.

1. Which cells in the plant have RuBisCO?
2. Does photorespiration occur in these plants?
3. In which cells the CO₂ fixation initially occurs.

What is called amphibolic path? Write any four differences between Respiration and Photo-synthesis.

Differentiate between prophase and prophase I.