1. Which among the following kinds of roots are found in Sugarcane?
[A] Prop Roots
[B] Stilt Roots
[C] Pneumatophores
[D] Nodulose Roots
Show Answer
Correct Answer: B [Stilt Roots]
Notes:
In Maize and Sugarcane, roots arise from the first few nodes of the stem and penetrate obliquely down in to the soil and give support to the plant. They are called Stilt roots.
2. Cell membranes contain some biochemicals which are responsible for cell recognition and adhesion. They are _________ ?
[A] Proteins
[B] Lipids
[C] glycoproteins and gycolipids
[D] None of the above
Show Answer
Correct Answer: C [glycoproteins and gycolipids]
Notes:
Cell membranes contain some biochemicals which are responsible for cell recognition and adhesion. They are glycoproteins and glycolipids. Lipid and proteins on the cell membrane surface often have short carbohydrate chains protruding out from the cell surface which are known as glycolipids and glycoproteins.
3. Which among the following is / are correct regarding a mature sperm and ovum?
[A] They both are of approximately same size
[B] They both have equal number of Chromosomes
[C] They both contain flagella
[D] None of the above
Show Answer
Correct Answer: B [They both have equal number of Chromosomes]
Notes:
The number of chromosomes is reduced from 46 (23 pairs) to 23 during the process of meiosis. In a human egg or sperm, there are 23 chromosomes, one of which is an X or Y. A human egg is haploid (has 23 chromosomes) and a sperm is haploid (has 23 chromosomes).
4. Which among the following is not a carnivorous plant?
[A] Pitcher plant
[B] Venus Fly Trap
[C] waterwheel plant
[D] Marsh Mallow
Show Answer
Correct Answer: D [Marsh Mallow]
Notes:
Marsh Mallow is not a carnivorous plant. Whereas Pitcher plant, Venus Fly Trap and waterwheel plant are carnivorous plants. Carnivorous plants derive some or most of their nutrients from trapping and consuming animals or protozoans, typically insects and other arthropods.
5. For respiration in deep sea, divers use mixture of:
[A] Oxygen and helium
[B] Oxygen and hydrogen
[C] Oxygen and carbon dioxide
[D] Oxygen, Helium & nitrogen
Show Answer
Correct Answer: D [Oxygen, Helium & nitrogen]
6. Which among the following nitrogenous wastes requires the least water for its excretion?
[A] Ammonia
[B] Urea
[C] Nitrites
[D] Uric Acid
Show Answer
Correct Answer: D [ Uric Acid]
Notes:
Uric acid is not soluble in water and is excreted as a dry crystal by the animal’s digestive system. Ammonia is the most toxic nitrogenous waste and must be excreted in large volumes of water.
7. Which of the following two vegetables are in same Genus Solanum?
[A] Potato and Brinjal
[B] Potato and Cauliflower
[C] Brinjal and Chilli
[D] Tomato and Radish
Show Answer
Correct Answer: A [Potato and Brinjal]
Notes:
Potato and Brinjal have several common features and are thus included in the same genus Solanum. The scientific name of Potato is Solanum tuberosum and Brinjal is Solanum melongena.
8. In which of the following part of the cell does the pyruvic acid is broken down into carbon dioxide, water and energy?
[A] Mitochondria
[B] Chloroplast
[C] Nucleus
[D] Cytoplasm
Show Answer
Correct Answer: A [Mitochondria]
Notes:
In Mitochondria, pyruvic acid is broken down into carbon dioxide, water and energy.
9. Which of the following is the later (Second) formed primary xylem elements?
[A] Xylem fibres
[B] Metaxylem
[C] Xylem parenchyma
[D] Protoxylem
Show Answer
Correct Answer: B [Metaxylem]
Notes:
Metaxylem is the part of the primary xylem that differentiates after the protoxylem and that is distinguished typically by broader tracheids and vessels with pitted or reticulate walls.
10. Stripes can be seen over the body of many animals. Which of the following indication is given by the stripes?
[A] Mating habit
[B] Food habit
[C] Cave dwelling
[D] Matching of skin colour with surroundings
Show Answer
Correct Answer: D [Matching of skin colour with surroundings]
Notes:
Some animals have stripes on their back because of the Camouflage Effect. Camouflage effect refers to combination of different colours or materials in order to make animals or objects hard to see or to disguise oneself in the surrounding. Striped Animals can easily hunt other animals by disguising themselves in the surrounding and making it hard for other animals to see.
