43
In woody plants, grass and water vapour are transported across the stems by the
- A. xylem fibres
- B. medullary rays
- C. sieve tubes
- D. phloem fibres
- E. phloem parenchyma
44
Which of the following statements is NOT true of mammalian erythrocytes?
- A. They have haemoglobin
- B. they appear yellow when looked at singly
- C. They are disc shaped
- D. The cell are more numerous than leucocytes
- E. They have nuclei at maturity
45
Which of the following elements are necessary for the formation of chlorophyll in a plant?
- A. magnesium and iron
- B. Calcium and potassium
- C. Calcium and sulphur
- D. Potasium and sulphur
- E. Phosphorus and potassium
46
If an organic compound has its hydrogen: oxygen ratio as 2:1, it is likely to be
- A. a protein
- B. a cabohydrate
- C. a fat
- D. a fatty acid and glycerol
- E. an amino acid
47
Herbs differ from shrubs because they
- A. do not produce fruit
- B. are useful to herbalist
- C. do not become woody
- D. are only annual
- E. are only perennials
48
Which of the following structure is NOT found in the female agama lizard?
- A. Pre-anal pads
- B. Eardrum
- C. Gular fold
- D. Nasal scale
- E. Nuchal crest
49
In a dicot leaf, guard cells differ from other epidermal cells because they
- A. have no definite shape
- B. lack nuclei
- C. are smaller
- D. contain chloroplast
- E. lack vacuole
50
Root hairs are developed from the
- A. root apex
- B. epidermis of root
- C. vascular bundles
- D. endodermis
- E. pericycle