Q. Explain the $C_4$ cycle of photosynthesis.

Q. Explain the role of pancreas in digestion of various food materials.

Q. The dark coloured dead wood present in the central region of old trees is

1. Spring wood
2. Heart wood
3. Cambium
4. Sap wood

Q. Define:
(i) Radial vascular bundle (ii) Rigor mortis (iii) Root pressure

Q. Briefly describe the stages in clothing of blood.

Q. State the best-known contributions of

Q. Archaeopteryx is a connecting link between reptiles and birds. Justify the statement by giving two characteristics of each group.

Q. The cells of the areolar tissue which produce heparin are

1. Mast cells
2. Macrophages
3. Fibrocytes
4. Chondrocytes

Q. Expand the following

Q. Dwarfism accompanied with mental retardation is due to hyposecretion of

1. Growth hormone
2. Parathormone
3. Thyroxine hormone
4. Adrenalin hormone

Q. Explain what would happen if:
(i) Excess fertilizers are added to soil.
(ii) Blood clots in the coronary artery.
(iii) Beta cells in the islets of langerhans are damanged.
(iv) Silicon emulsion is applied over the surface of leaves.
(v) Magnesium element is deficient in the soil

Q. State four characteristics of the cromagnon man.

Q. Oxygen released in photosynthesis is due to

1. Photophosphorylation.
2. Photolysis of water.
3. Photorespiration.
4. Photons.

Q. Explain the basic postulates of Darwinism.

Q. Draw a labelled diagram of the T.S. of bone

Q. The cell division in the tunica region of shoot apex is

1. Periclinal
2. Horizontal
3. Anticlinal
4. Radial

Q. State four differences between transpiration and guttation.

Q. What are tropic hormones? Describe the feedback control of tropic hormones with an example

Q. Give one significant difference between each of the following:
(i) Implantation and Parturition.
(ii) Active absorption and Passive absorption.
(iii) Simple fruit and Aggregate fruit.
(iv) Auricles and Ventricles

Q. The spinal nerve is

1. A sensory nerve
2. A motor nerve
3. A cranial nerve
4. A mixed nerve

Q. Give four differences between root apex and shoot apex

Q. State three advantages and three disadvantages of vegetative reproduction

Q. Explain the conduction of nerve impulse through a nerve fibre

Q. Differentiate between apes and man with respect to the following characteristics:
(i) Posture (ii) Cranium (iii) Brow ridges (iv) Locomotion

Q. Mention one role and one deficiency symptom of the following elements in plant nutrition:
(i) Phosphorus (ii) Iron (iii) Chlorine

Q. Give an account of the secretory phase of menstrual cycle.

Q. Explain the development of the different types of endosperms in angiosperms

Q. Give three differences between natural selection and artificial selection.

Q. Explain briefly:
(i) Capillary water (ii) Osmosis (iii) Aeroponics

Q. Define:
(i) Vestigeal organs (ii) Variations (iii) Neo-Darwinism