A. Choose the correct alternatives and rewrite the complete sentences
1. .................... is necessary to obtain energy from glucose and fatty acid.
(a) Oxygen (b) Hydrogen (c) Water (d) Nitrogen
2. In certain sensitive plants like Mimosa, movement is in response to the
stimulus of ..................... .
(a) gravity (b) air (c) light (d) touch
3. The movement of the plant in response to the stimulus of light is called
..................... movement.
(a) gravitropic (b) hydrotropic (c) phototropic (d) chemotropic
4. When light falls on a part of growing plant, a hormone called .....................
is synthesized at the tip of the shoot.
(a) auxin (b) abscissic acid (c) gibberellins (d) cytokinins
5. The movement of the root system towards the stimulus of gravity is called
..................... movement.
(a) gravitropic (b) hydrotropic (c) phototropic (d) chemotropic
6. The movement of the root system towards the stimulus of water is called
..................... movement.
(a) gravitropic (b) hydrotropic (c) phototropic (d) chemotropic
7. ..................... hormones help in the growth of the stem.
(a) Auxins (b) Abscissic acid (c) Gibberellins (d) Cytokinins
8. ..................... hormones promote cell division.
(a) Auxins (b) Abscissic acid (c) Gibberellins (d) Cytokinins
9. ..................... is a plant hormone which inhibits growth wilting of leaves.
(a) Auxin (b) Abscissic acid (c) Gibberellins (d) Cytokinins
10. The ..................... is the main thinking part of the brain.
(a) cerebrum (b) cerebellum (c) medulla oblongata (d) spinal cord
11. The brain can stay alive for ..................... without oxygen.
(a) 4-6 hours (b) 5-6 hours (c) 24 hours (d) 4-6 minutes
A. Answers
1. Oxygen
2. Touch
3. Phototropic
4. Auxin
5. Gravitropic
6. Hydrotropic
7. Gibberllins
8. Cytokinins
9. Abscissic acid
10. Forebrain or cerebrum
11. 4 – 6 minutes
B. Fill in the blanks :
*1. ..................... do not possess a nervous system.
*2. Response to the stimulus of touch is called ..................... whereas response to the stimulus of chemicals is called as.................. .
*3. Brain is the main ..................... centre of the body.
*4. The loss of water from the plants is known as ..................... .
5. ..................... refers to the systematic regulation of various activities.
6. ..................... means the orderly execution of the activities.
7. Transpiration takes place in the leaves through the ..................... .
8. The food is mixed with the ..................... in the saliva secreted by the
salivary glands.
9. The movement or growth of any part of a plant in response to an external
stimulus is called ..................... .
10. The plants use ..................... means to transfer information from one cell
to another.
11. The nerves are composed of neurons and ..................... .
12. The neurons are specialized cells capable of transmitting ..................... .
13. ..................... neurons conduct impulses from the sense organs to the
brain and spinal cord.
14. ..................... neurons conduct impulses from the brain and spinal cord to
the effector organs.
15. ..................... neurons perform the integrative functions of the nervous
system.
16. ..................... keeps the CNS well nourished and also protects it by absorbing mechanical shocks.
17. The chemical control is brought about by chemical substances called
..................... .
18. The hormones are secreted by the ..................... glands.
19. Endocrine glands are also known as the ..................... glands.
20. Hormones are also referred to as ..................... .
21. Insect ..................... is under hormonal control.
22. In frogs ..................... secretion stimulates the metamorphosis from tadpole to adult frog.
23. In the ....................., hormones induce colour changes and are influential in regulating development.
24. The left hemisphere of the brain has ..................... more neurons than the right hemisphere.
25. ..................... of blood flows through the brain every minute.
26. In certain coelenterates like ....................., the nervous system is at a very primitive stage of developments.
A. Answers.
1. Plants
2. Seismonastic movement,, chemotropism
3. Thinking
4. Transpiration
5. Control
6. Co – ordination
7. stomatal opening
8. enzymes
9. tropism or tropic movement
10. electrochemical
11. neuroglia
12. electrochemical impulses
13. sensory
14. motor
15. association
16. cerebrospinal fluid (CSF)
17. hormones
18. endocrine
19. ductless
20. chemical messengers
21. metamorphosis
22. thyroid
23. arthropods
24. 186 millions
25. 750 – 1000 ml.
26. Hydra
SCIENCE & TECH.
CH. NO. 1 SCHOOL OF ELEMENTS
CH. NO. 2 THE MAGIC OF CHEMICAL REACTIONS
CH. NO. 3 ACID BASE CHEMISTRY
CH. NO. 4 ELECTRIC SPARK
CH. NO. 5 ELECTROMAGNETISM
CH. NO. 6 WONDERS OF LIGHT PART - I
CH. NO. 7 WONDERS OF LIGHT PART II
CH. NO. 8 UNDERSTANDING METALS NON METALS
CH. NO. 9 AMAZING WORLD OF CARBON COMPOUNDS
CH. NO. 10 LIFE'S INTERNALSECRETS
CH. NO. 11 REGULATORS OF LIFE
CH. NO. 12 LIFE CYCLE
CH. NO. 13 MAPPING OUR GENES
CH. NO. 14 STRIVING FOR BETTER ENVIRONMENT PART I
CH. NO. 15 STRIVING FOR BETTER ENVIRONMENT PART - II
