Morphology of Flowering Plants — BIOLOGY STD 11 Science — Question

Differentiate between keratinised and non-keratinised stratified squamous epithelia.

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?

Write any four differences between chordates and non-chordates.

At a stage of their cycle, ascomycetes fungi produce the fruiting bodies like apothecium, perithecium or cleistothecium. How are these three types of fruiting bodies different from each other?

How is expiration carried out under normal physiological conditions?

i. What is meant by bioassay? Name the two bioassays that are used to examine auxin activity in plants.
ii. Name the hormone that acts as an antagonist to abscisic acid. From which microorganism was it extracted initially? List two bioassays of this growth hormone.

Explain the basic structure of an Amino acid.

Proteins have a primary structure. If you are given a method to know which amino acid is at either of the two termini (ends) of a protein, can you connect this information to purity or homogeneity of a protein?

Find examples where the four daughter cells from meiosis are equal in size and where they are found unequal in size.

What is the general structure of Bryophytes?