MODEL PAPER 6 — BIOLOGY STD 11 Science — Question

How do you call the conduction of impulse along a myelinated nerve fibre?

Define the term mycorrhiza. How are these associations affect a plant? Explain with examples.

Explain why.

1. Water can reach up to endodermis through apoplast but it moves through the endodermis by symplast.
2. Primary xylem in root is exarch and in stem it is endarch.

Differentiate between macronutrieints and micronutrients with an example of each.

Abhay, a police officer, discovered a human pelvis from the jungle. After checking the reports of missing people, he found that a couple had been missing from that area since a month. Abhay was confused as to whom the pelvis belonged to and therefore, took it to the forensic investigator. The forensic expert reported it to be a female pelvis. Afterwards, the DNA from the missing female's mother and pelvis was matched. Since, both the DNA matched. It confirmed that out of the couple, the lady had died.

1. How did the investigator opened it to be a female pelvis?
2. What other bones of human can be used for sex identification?
3. Give a possible reason for the change in female pelvis.
4. What values are shown by Abhay?

In a given habitat we have 20 plant species and 20 animal species. Should we call this as ‘diversity’ or ‘biodiversity’? Justify your answer.

Ruchi's father was not well for last 8 days. He gave pale look in his eyes and skin all over the body, when she saw his father's degrading health became worried and took him to the doctor. The doctor did the medical check up and found that he was suffering from jaundice.

1. How is Jaundice cause?
2. Mention the functions of RBCs.
3. What values are shown by Ruchi towards her father?

How are ascospores and conidia, both produced by Ascomycetes, different from each other?

Cyanobacteria and heterotrophic bacteria have been clubbed together in Eubacteria of kingdom Monera as per the “Five Kingdom Classification” even though the two are vastly different from each other. Is this grouping of the two types of taxa in the same kingdom justified? If so, why?

Briefly describe the structure of the Brain.