MODEL PAPER 9 — BIOLOGY STD 11 Science — Question

What are secondary sexual characters?

Differentiate between:
Fibrous root and adventitious root.

Name the excretory organs/ structures of:

1. Earthworm.
2. Planaria.
3. Amphioxus.
4. Frog.

Excretion is an important process as it helps in getting rid of waste from the body. Which of these is similar to this fact? What is the importance of maintaining cleanliness at public places?

1. Cleaning our home is necessary to create a healthy place for living.
2. Garbage should be thrown out every day.
3. Garbage dumping sites should be far away from the city limits.

Explain Collenchyma.

In tropical rain forests, the canopy is thick and plants growing below receive filtered light. How are they able to carry out photosynthesis?

If the critical photoperiod for a short-day plant is 13hrs of daylight, will it flower when there are 15hrs of daylight?

What is the difference between primary and secondary metabolites?

Differentiate between primary and secondary meta bolites.

What are neurotransmitters? Where are they present? Mention their functions in our body.