Select the wrong statement:
1. | The walls of diatoms are easily destructible |
2. | Diatomaceous earth is formed by the cell walls of diatoms |
3. | Diatoms are chief producers in the oceans |
4. | Diatoms are microscopic and float passively in water |
The label of a herbarium sheet does not carry information on:
1. date of collection
2. name of collector
3. local names
4. height of the plant
Conifers are adapted to tolerate extreme environmental conditions because of?
1. broad hardy leaves
2. superficial stomata
3. thick cuticle
4. the presence of vessels
Which one of the following statements is wrong?
1. | Algae increase the level of dissolved oxygen in the immediate environment |
2. | Algin is obtained from red algae and carrageenan from brown algae |
3. | Agar-agar is obtained from Gelidium and Gracilaria |
4. | Laminaria and Sargassum are used as food |
The term 'polyadelphous' is related to?
1. gynoecium
2. androecium
3. corolla
4. calyx
How many plants among Indigofera, Sesbania, Salvia, Allium, Aloe, mustard, groundnut, radish, gram and turnip have stamens with different lengths in their flowers?
1. Three
2. Four
3. Five
4. Six
Radial symmetry is found in the flowers of?
1. Brassica
2. Trifolium
3. Pisum
4. Cassia
Free-central placentation is found in?
1. Dianthus
2. Argemone
3. Brassica
4. Citrus
Cortex is the region found between?
1. epidermis and stele
2. pericycle and endodermis
3. endodermis and pith
4. endodermis and vascular bundle
The balloon-shaped structures called tyloses:
1. originate in the lumen of vessels
2. characterise the sapwood
3. are extensions of xylem parenchyma cells into vessels
4. are linked to the ascent of sap through xylem vessels