10th class board examination -biological science mock test -set 3

10th Class Board Examination - Biological Science Mock Test (Set 3)

Section A: Multiple Choice Questions (1 Mark Each)

1. The xylem in plants is responsible for the transport of: A) Water B) Food C) Amino acids D) Oxygen

2. Iodine is necessary for the synthesis of which of the following hormones? A) Adrenaline B) Thyroxin C) Auxin D) Insulin

3. After fertilization, which part of the flower develops into a fruit? A) Ovule B) Petals C) Ovary D) Stigma

4. In Mendelian genetics, the gene combination for a heterozygous tall pea plant is represented as: A) TT B) tt C) Tt D) tT

5. Which of the following is a non-biodegradable pollutant? A) Paper B) Cotton cloth C) Wood D) Plastic

6. The actual site of photosynthesis in a plant cell is the: A) Mitochondria B) Cytoplasm C) Chloroplast D) Nucleus

7. Involuntary actions in the human body, such as blood pressure, salivation, and vomiting, are controlled by the: A) Medulla in the hindbrain B) Cerebellum in the hindbrain C) Cerebrum in the forebrain D) Hypothalamus

8. Vegetative propagation in Bryophyllum takes place naturally through its: A) Stem B) Roots C) Leaves D) Flowers

9. In human beings, the sex of a child is determined by the: A) Size of the egg cell B) Chromosomes inherited from the mother C) Chromosomes inherited from the father D) Hormones produced during pregnancy

10. Ozone is a deadly poison, yet it performs an essential function in the upper atmosphere. An ozone molecule is made up of how many atoms of oxygen? A) 1 B) 2 C) 3 D) 4

Section B: Short Answer Questions (2 Marks Each)

11. State two main differences between autotrophic and heterotrophic modes of nutrition.

12. What are phytohormones (plant hormones)? Name any two plant hormones.

13. Why is DNA copying considered an essential part of the process of reproduction?

14. Define the term 'puberty'. List two physical changes that occur specifically in boys during this stage.

15. What is 'biological magnification' (biomagnification)?

Answer Key & Solutions

Section A: MCQs

  1. A (Water)

  2. B (Thyroxin)

  3. C (Ovary)

  4. C (Tt)

  5. D (Plastic)

  6. C (Chloroplast)

  7. A (Medulla in the hindbrain)

  8. C (Leaves)

  9. C (Chromosomes inherited from the father)

  10. C (3)

Section B: Short Answers

Answer 11: * Autotrophic Nutrition: Organisms synthesize their own complex organic food from simple inorganic raw materials (like CO2 and water) using sunlight. Example: Green plants.

  • Heterotrophic Nutrition: Organisms cannot synthesize their own food and depend directly or indirectly on other organisms for their nutritional requirements. Example: Animals and fungi.

Answer 12: Phytohormones, or plant hormones, are naturally occurring chemical compounds that control and coordinate growth, development, and responses to the environment in plants. Examples: Auxins, Gibberellins, Cytokinins, or Abscisic acid (any two).

Answer 13: DNA copying is essential during reproduction because DNA carries the genetic information required for the formation and functioning of a new individual. Copying DNA ensures that each daughter cell receives a complete set of genetic instructions, passing traits from the parent to the offspring and maintaining the characteristics of the species.

Answer 14: Puberty is the period of life during which the reproductive organs begin to function, and the individual becomes sexually mature. Two changes in boys: (1) Growth of thick hair on the face (beard and mustache) and body. (2) Deepening or cracking of the voice.

Answer 15: Biological magnification is the phenomenon where the concentration of harmful, non-biodegradable chemicals (like pesticides or heavy metals) increases progressively at each successive trophic level in a food chain. Because these chemicals are not degraded, they accumulate, resulting in the highest concentrations occurring in the top predators.

Comments

Post a Comment

Popular posts from this blog

7 Common Causes of Joint Pain in Seniors

Image
  7 Common Causes of Joint Pain in Seniors (Senior Joint Pain Causes) As people grow older, joint pain in seniors becomes a common health concern. Many older adults experience stiffness, swelling, or discomfort in the knees, hips, shoulders, and hands. Understanding the common causes of joint pain in seniors can help people take early steps to protect their joints and maintain an active lifestyle. In many cases, simple lifestyle changes and proper care can reduce pain and improve mobility. 1. Osteoarthritis – A Major Cause of Joint Pain in Seniors One of the most common causes of joint pain in seniors is Osteoarthritis . This condition occurs when the protective cartilage that cushions the joints gradually wears down over time. When cartilage becomes thin, bones may rub against each other, leading to pain, stiffness, and swelling. Osteoarthritis most often affects the knees, hips, hands, and spine. Seniors may notice pain especially after physical activity or after long per...
Read more

Fall Prevention Tips Every Senior Should Know

Image
  Fall Prevention Tips Every Senior Should Know As we grow older, fall prevention for seniors becomes extremely important. A simple fall at home can affect independence and health. The good news is that most falls are preventable with small, practical changes. Here are essential fall prevention tips every senior (and family member) should know. 1. Keep Floors Clear and Clutter-Free Loose wires, small furniture, newspapers, and uneven rugs are common causes of falls. Remove unnecessary items from walkways. Secure carpets with non-slip backing. Keep frequently used items within easy reach. A clear walking path is the first line of defense. 2. Improve Home Lighting Poor lighting makes it difficult to see obstacles. Install bright lights in hallways and staircases. Use night lights in bedrooms and bathrooms. Keep a lamp near the bed for easy access. Good lighting reduces hesitation and prevents missteps. 3. Wear Proper Footwear Slippers without grip ...
Read more

How to Improve Sleep After 65: Simple Tips for Better Health and Rest

Image
  How to Improve Sleep After 65: Simple Tips for Better Health and Rest Good sleep becomes more important as we grow older. However, many seniors find it difficult to sleep well at night. Learning how to improve sleep after 65 can help you feel more energetic, think clearly, and maintain good health. With a few simple lifestyle changes, seniors can enjoy deeper and more refreshing sleep. 1. Create a Comfortable Environment to Improve Sleep After 65 A peaceful bedroom is very important to improve sleep after 65 . Your bedroom should be quiet, dark, and comfortable. Here are a few simple tips: Keep the room cool and well-ventilated Use comfortable pillows and mattress Reduce noise and bright lights Avoid watching television in bed A calm sleeping environment helps the brain relax and prepares the body for good sleep. 2. Maintain a Daily Routine to Improve Sleep After 65 Following a regular routine can greatly improve sleep after 65 . Our body has a natural clo...
Read more