Questions
Which of the following cells in a plant organ helps the organism to perform conduction of water?
- Phloem
- Epidermis
- Xylem
- Cambium
- Collenchyma
Which of the following is not a characteristic of meristematic tissue?
- Its component cells are small, spherical or polygonal and undifferentiated.
- Intercellular spaces are absent.
- Cell wall of its cells is thin and elastic.
- A large central vacuole occurs in living permanent cells.
- Its cells grow and divide regularly.
Which of the following is not a function of parenchyma?
- Parenchyma acts as a primary support to the stem of herbaceous plants.
- Parenchyma stores and assimilates food.
- Transport of material occurs through cell walls of parenchyma cells.
- It is a mechanical tissue in young dicotyledonous stems and provide mechanical support and elasticity.
- The intercellular air spaces of parenchyma cells allow gaseous exchange.
The walls of cork cells are heavily thickened with an organic substance called
- epidermis
- suberin
- phelloderm
- cutin
- pectin
Match the following:
| a. Apical meristems | 1. These are located at the base of leaves and internodes. |
| b. Lateral meristems | 2. These are found beneath the bark and in vascular bundles of dicot roots and stems. |
| c. Intercalary meristems | 3. These are situated at the growing tip of stems and roots. |
- a - 3, b - 1, c - 2
- a - 3, b - 2, c - 1
- a - 2, b - 3, c - 1
- a - 1, b - 3, c - 2
- a - 1, b - 2, c - 3
The cell walls of sclerenchyma are greatly thickened with
- xylem
- phloem
- lignin
- aerenchyma
- epidermis
Acne and pimples on the face are due to the secretion of ____________________.
- tear glands
- sebaceous glands
- bile from liver
- enzymes in the digestive tract
- sweat glands
What is the protruding part of the throat seen in boys during adolescence called?
- Voice chamber
- Larynx
- Pharynx
- Adam's orange
- Proboscis
Which hormone helps the body in controlling stress?
- Estrogen
- Testosterone
- Adrenaline
- Thyroxine
- Insulin
Suresh's father was suffering from ‘diabetes’ because his pancreas was not producing a hormone in a sufficient quantity. Identify the hormone.
- Thyroxine
- Vasopressin
- Insulin
- Estrogen
- Adrenaline
Which of the following changes are seen in a boy during puberty?
a. Wider chest
b. Broadening of shoulders
c. Wider spine bones
d. Broadening of pelvis
- a and d
- c and d
- a and d
- a and b
- b and d
If fertilisation does not occur, the process of shedding of the uterine wall is called
- menarche
- menstruation
- implantation
- pregnancy
- menopause
By which mode of reproduction does a hydra reproduce?
- Regeneration
- Budding
- Zygote formation
- Binary fission
Which of the following organisms reproduces by asexual reproduction?
- Frog
- Cow
- Butterfly
- Amoeba
Which of the following is true about binary fission?
- It involves the division of nucleus only.
- It involves the division of nucleus and then the complete cell.
- It involves the division of nucleus into four nuclei.
- The division of nucleus does not take place, but the cell divides to form daughter cells.