MODEL PAPER 5 — BIOLOGY STD 11 Science — Question

A rubber band stretches and reverts back to its original position. Bubble gum stretches, but it would not return to its original position. Is there any difference between the two processes? Discuss it with respect to plant growth (Hint: Elasticity (reversible) Plasticity (irreversible)).

Differentiate between ureotelism and ammonotelism.

Many discoveries in science have been accidental. This is true for plant hormones also. Can you justify this statement by giving an example? Also what term is used for such accidental findings?

What are the main structures in a monocot seeds? Describe with the help of suitable diagram.

Give a diagrammatic representation of classification of Protista.

During the guest lecture organised by the school biology club, the professor explained students how soil acts as medium in providing growth to the plant. And how plants obtain most of their inorganic nutrients from the soil. Ravi was curious to know the mechanism behind. He reached tution in the evening and asked his biology tutor about what basic functions does soil play and how these inorganic nutrients 21 formed in the soil. Tutor explained that inorganic nutrients are formed from the weathering of rocks etc.

1. Why are inorganic nutrients called mineral nutrients?
2. Give any two functions of soil.
3. How the ions of these elements are absorbed by the plants.
4. What values are reflected from Ravi's tutor's character.

Write the differences in DNA and RNA.

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.

An abnormal type of secondary growth is called anomalous secondary growth.

1. In which plants it occur?
2. How does it occur?

Radha's father who is a diabetic patient does not avoid food items doctor has told him in diet. He also feels lazy to go for a walk. One day, his glucose level was checked by his doctor. The doctor advised him to take injections regularly, as he was not able to control his diabetes with diet and medication. He came home and while telling the things to Radha's mother, Radha (biology student) heard them and interrupted in between. She explained that, doctor has given insulin injections to control his blood glucose level. This may be discontinued, if he will take precautions in his daily routine.

1. Which endocrine gland and its part is involved in the secretion of inslin?
2. Why doctor preferred him to take insulin injections and what is the role of insulin in controlling level of glucose in blood?
3. What precaution he should take to protect himself from such disorder?
4. What are the values reflected from Radha's character as a biology student and a daughter?