Respiration In Plants — BIOLOGY STD 11 Science — Question

1. Draw a neat labelled diagram of the vertical section of a maize grain.
2. Why can we not use the term seed for maize grain?

Explain how ATP synthase (complex V) helps in the synthesis of ATP in mitochondria with the help of a diagram.

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))

Vicky's mother was very concerned about his son. She always used to give him advices on how he should study, what is good for his health, and about everything. One day Vicky saw some, birds flying independently and asked his mother that why don't animals take care of their young ones like humans. Her mother smiled and explained that parental care is also well-developed in some animals.

1. Explain parental care in mammals.
2. Which other animals show parental care and how?
3. What does parental care indicate? bine
4. What values are shown by Vickey's mother?

Explain the composition of triglyceride.

Write the functions in brief in Column B, appropriate to the structures given in Column A.

1. Nictitating membrane __________.
2. Tympanum __________.
3. Copulatory pad __________.

Give a brief account of viruses with respect to their structure and nature of genetic material. Also name four common viral diseases.

Explain how the activities of the gastro-intestinal tract are regulated for proper coordination of its different parts.

Different types of teeth are responsible for different steps of mastication. This is similar to which of these? Why should we take good care of our teeth?

1. We need different types of tools to carry out different tasks.
2. We need different modes of transport to travel.

Are the different types of plastid interchangable? If yes, give examples where they are getting converted from one type to another.