PART - 1 - Unit III : CH - 9 Biomolecules — BIOLOGY STD 11 Science — Question

1. Name one gymnosperm in which the male and female cones/ strobili are borne on:

• The same plant.
• Different plants, respectively.

2. Where are pollen grains formed in a gymnosperm?
3. Mention the economic uses of agar.

Evaluate how did the development of plants, from algae to angiosperms may have taken place.

Describe any four classes of enzymes. Make distinction between prosthetic group and coenzymes.

What would be expected to happen if:

1. GA₃ is applied to rice seedlings
2. dividing cells stop differentiating
3. a rotten fruit gets mixed with unripe fruits
4. you forget to add cytokinin to the culture medium.

Lalit, an engineer in a mechanical field used to skip his meals and used to eat junk food in hurry. Few days back Lalit complained about the frequent chest pain to his friends. One of his friend advised him to immediately visit a doctor as this might have been related to some heart disorder. Lalit visited doctor who told him to go for an ECG (Electrocardiogram). Lalit asked the
doctor about the utility of this test.

1. What is electrocardiography?
2. What does a human electrocardiogram indicate?
3. What is the utility of an ECG?
4. What values are reflected from Lalit's behaviour?

Describe prophase I of meiotic cell division. How is it different from prophase II of meiosis?

Define and explain the process of fermentation in animals, yeast and bacteria.

Explain the advantage of the complete partition of ventricle among birds and mammals and hence leading to double circulation.

Explain the morphology of an earthworm.

Explain the reproductive system in cockroach with the help of suitable diagrams.