Plant Growth and Development — BIOLOGY STD 11 Science — Question

Out of the parts labelled as A, B, C and D of alimentary canal in the diagram below. Where is the enzyme responsible for the first stage of protein digestion produced? Label all parts , i.e., A-D.

Name the hormones that regulate the following:

1. Control of skin colour.
2. Release of sugar from liver.
3. Widening of pelvis at birth.
4. Leydig's cells of testis.

Birds and mammals share one of the following characteristics as a common feature.

1. Pigmented skin.
2. Pneumatic bones.
3. Viviparity.
4. Warm blooded.

What is the nature of xylem elements in spring and autumnwood?

If one wants to find minerals in the form they are mobilised in the plant, how will the analysis of the exudate help?

What is vital capacity? Compared to the atmosphere, there may be partial pressure of O₂ and CO₂ on various parts involved in diffusion.

Which of the following organisms is having a two-chambered heart?

1. Frog
2. Cobra
3. Shark
4. Platypus.

Given below are floral formulae of some well-known plants. Identify and write to which plants these belong.

What is the habitat of ferns. Describe their plant body. Explain the nature of spores ferns have. List out some common ferns.

Which one of the following statements is incorrect?

1. Mesoglea is present in between ectoderm and endoderm in Obelia.
2. Exhibits radial symmetry Asterias.
3. Fasciola is a pseudocoelomate animal.
4. Taenia is a triploblastic animal.