Plant Kingdom — BIOLOGY STD 11 Science — Question

Discuss the types of enzyme cofactors that are required for the efficient activity of enzymes.

Define the following:

1. Respiration.
2. Respiratory substrate.
3. How does a tree trunk exchange gases with the environment although it lacks stomata?
4. Which is the most important energy carrier? Is this compound mobile?
5. Name the major respiratory substrates used by most organisms. It unavailable at time, what other substances can be used for respiration?

How does reabsorption take place in the excretory system in human?

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?

Look at leaves of the same plant on the shady side and compare it with the leaves on the sunny side. Or, compare the potted plants kept in the sunlight with those in the shade. Which of them has leaves that are darker green ? Why?

Two groups (A and B) or bean plants of similar size and same leaf area were placed in identical conditions. Group A was exposed to light of wavelength 400-450nm and Group B to the light of wavelength of 500-550nm. Compare the photosynthetic rate of the two groups by giving reason.

Neurospora- an ascomycetes fungus has been used as a biological tool to understand the mechanism of plant genetics much in the same way as Drosophila has been used to study animal genetics. What makes Neurospora so important as a genetic tool?

How are gibberellins useful in agriculture to improve productivity. Give any three points in support of your answer.

Who discovered the nucleus? Write any five works of nuclear membrane.

Write a note on regulation of cardiac activity.