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Q1. State Two Functions Performed by Bile Juice. Ans: Bile Juice Is A Greenish Yellow Liquid Made in The Liver

The document contains 13 questions and answers about various topics in biology. It discusses the functions of bile juice in emulsifying and digesting fats, the end products of protein and fat digestion, the process of translocation in plants, the effects of removing xylem in plants, that auxin is a plant hormone synthesized in shoot tips that promotes growth, that the cerebellum controls posture and balance, the functions of parts of the hind brain, the three types of cells in blood and their functions, diagrams of the excretory and digestive systems, why diffusion is insufficient for oxygen transport in humans, the importance of sustainable management of resources, and the main steps and advantages of sexual reproduction.

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98 views5 pages

Q1. State Two Functions Performed by Bile Juice. Ans: Bile Juice Is A Greenish Yellow Liquid Made in The Liver

The document contains 13 questions and answers about various topics in biology. It discusses the functions of bile juice in emulsifying and digesting fats, the end products of protein and fat digestion, the process of translocation in plants, the effects of removing xylem in plants, that auxin is a plant hormone synthesized in shoot tips that promotes growth, that the cerebellum controls posture and balance, the functions of parts of the hind brain, the three types of cells in blood and their functions, diagrams of the excretory and digestive systems, why diffusion is insufficient for oxygen transport in humans, the importance of sustainable management of resources, and the main steps and advantages of sexual reproduction.

Uploaded by

singhkhoosbu6
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Q1. State two functions performed by bile juice.

Ans: Bile juice is a greenish yellow liquid made in the liver


which is normally stored in the gall bladder. Bile juice is
alkaline, and contain salts which help to emulsify or break the
fats (or lipids) present in the food. Thus, bile juice perform two
functions:
i. It makes the acidic food coming from the stomach
alkaline so that pancreatic enzymes can act on it.
ii. Bile Salts break the fats present in the food into small
globules making it easy for the enzymes to act and
digest them.

2. Name the end products formed on complete digestion of


proteins and fats.
Answer: The food is completely digested in small intestine;
where the walls of small intestine contain glands which secrete
intestinal juice .The intestinal juice contain a number of
enzymes which complete the digestion of complex proteins into
amino acid and fats into fatty acid and glycerol.
Q3. What is translocation in plant?
Answer: Translocation is the movement of materials in plants from
the leaves to other parts of the plant. Nutrients, mainly sugars, are
created in the leaves during photosynthesis. These are then
transported throughout the plant through phloem, which are a long
series of connected cells.

Q4. What will happen to a plant if its xylem is removed?


Answer: Xylem is a water-conducting tissue in plants. It transports
water from the roots to the different parts of the plant. If the xylem of
the plant is removed, upward movement of water will stop leading to
the death of a plant.

Q5. Give an example of a plant hormone that promotes its


growth. Where is it synthesized?
Answer: Auxin is a plant hormone that promotes growth. It is
synthesized at the tip of the shoot, stems and root tips. Auxin
promotes cell elongation, helps in the growth of stems etc.

Q6. Name the part of the brain which controls posture and
balance of the body.
Answer: The cerebellum receives information from the sensory
systems, the spinal cord, and other parts of the brain and then
regulates motor movements. It regulates voluntary movements
such as posture, balance, coordination, and speech, resulting in
smooth and balanced muscular activity.
Q7. Mention the function of the hind brain in humans.
Answer: Hind brain consists of three parts-cerebellum, Pons
and medulla oblongata. Cerebellum is concerned with
coordination of muscular activity and body balance. Pons
carries impulses from one hemisphere of the cerebellum to
the other and coordinates muscular movements on both sides
of the body. Medulla oblongata controls the activity of
internal organs, heartbeat, breathing etc.
Q8. Mention the three kinds of cells present in blood. Write
one function of each.
Answer:
i. Red blood cells (erythrocytes). These carry oxygen from
the lungs to the rest of the body.
ii. White blood cells (leukocytes). These help fight infections
and aid in the immune process. ...
iii. Platelets (thrombocytes). These help in blood clotting.

Q9. Draw a neat diagram of excretory system of human beings


and label on it.
i) Left kidney ii) urinary bladder
Q10. Make labelled diagram of human digestive system.
Answer
Q11. Why is diffusion insufficient to meet the oxygen demand of
multi-cellular organisms like humans?

Answer: Diffusion is insufficient to meet the oxygen requirement of


multicellular organisms like human because all the cells are not direct
contact in environment and diffusion is a slow process. Diffusion is too
slow to cover the distance between the gas exchange surface and the
sites where the oxygen is required.

Q12. What is sustainable management? Why is it necessary

Answer: There exists a need to sustainably manage the natural


resources available on Earth (forests & wildlife, coal, petroleum, water,
etc.) so that they are available for future generations. One important
concept in the management of natural resources is the 3R principle,
which stands for “Reduce, Reuse and Recycle”

Q13. . State in sequence four main steps of sexual reproduction and


write two advantages of such reproductions.

Answer: four main steps of sexual reproduction are:


(i) Formation of gametes through meiosis.
(ii) Transfer of male gametes into the female body.
(iii) Fusion of male and female gametes' Process is fertilization.
(iv) Formation of offspring from a single-celled zygote

Two advantages of sexual reproductions are:


 It increases genetic diversity.
 It increases the raw variation necessary for evolution to occur.

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